Coleus forskohlii (Indian Coleus)

Coleus forskohlii (Indian Coleus)

Product Name: Колеус форсколиевый, Coleus forskohlii, Plectranthus barbatus, Coleus, Forskolie, Колео, Forskolina, Колеус форсколии, Колеус Форсколи, Форсколий, Колеус Барбатус, Форсколин, קוליוס פורסקוליה

Synonyms: Колеус, Индийская крапива, Форсколия, Бхараг (на хинди), Forskolin plant, Indian coleus, False boldo, Blumea camphor, Forskohlii root, Coleus barbatus, Coleus forskohlii root, Forskohlkraut, Coleus de l'Inde, Колео индус, كوليوس فورسكوليا, โคลิอัส ฟอร์สโคลิไอ

Main Indications for Use of Coleus forskohlii: Arterial hypertension, open-angle glaucoma, primary obesity, atopic bronchial asthma, psoriasis vulgaris, chronic ischemic heart disease, polycystic ovary syndrome, erectile dysfunction of vascular origin, congestive heart failure, subclinical hypothyroidism.

Use of Coleus forskohlii in mixtures and complexes: Type 2 diabetes mellitus, knee osteoarthritis, neurocirculatory dystonia of the hypertensive type, non-alcoholic fatty liver disease, allergic rhinitis, chronic bronchitis with an obstructive component, generalized anxiety disorders, benign prostatic hyperplasia.

Pharmacological Properties of Coleus forskohlii: antihypertensive, bronchodilator, lipolytic, insulin-sensitizing, vasodilating, antiglaucoma, antithrombotic, antiplatelet, cardiotonic, anti-inflammatory, antiandrogenic, immunomodulatory, antidepressant, anxiolytic, hepatoprotective, antiatherosclerotic, antiproliferative.

Dosage of Pharmacological Forms — Coleus forskohlii

Powder — Coleus forskohlii

Indications (Powder): Arterial hypertension, open-angle glaucoma, atopic bronchial asthma, primary obesity, psoriasis vulgaris, chronic ischemic heart disease, polycystic ovary syndrome, subclinical hypothyroidism.

Standard Dosage (Powder): Take 250 milligrams of powder 3 times a day 15 minutes before meals, with warm water at a temperature not exceeding 45 °C.

Enhanced Dosage (Powder): Take 400 milligrams of powder 3 times a day. Recommended for primary obesity of degree II–III, glaucoma with pronounced hypertension, bronchial asthma with a persistent obstruction component.

Maximum Dosage (Powder): Take 500 milligrams of powder 3 times a day. Used for resistant arterial hypertension, pronounced endocrine dysfunction of the thyroid gland, hormonally conditioned psoriasis.

Preventive Dosage (Powder): Take 200 milligrams of powder once a day in the morning on an empty stomach. Recommended for metabolic syndrome, chronic ischemic heart disease, subclinical hypothyroidism, patients with a hereditary predisposition to arterial hypertension. Preventive course — 30 days with a break of 10 days.

Pediatric Dosage (Powder): For children over 12 years of age, with body weight from 40 kilograms — 100 milligrams of powder 2 times a day. The sex of the child does not matter. Clinical studies have not been conducted in younger children.

Contraindications (Powder): Arterial hypotension, gastric and duodenal ulcer in the acute phase, severe heart failure of functional class III–IV, pregnancy. Data on contraindications during lactation and in childhood under 12 years of age have not been scientifically registered.

Side Effects (Powder): Headache, nausea, feeling of heat in the face, hypotensive reaction, tachycardia. All effects have been recorded when the dosage exceeds 600 milligrams per intake.

Adjustment for Patient Body Weight: For body weight less than 60 kilograms, the dosage should be reduced by 20%. For body weight above 90 kilograms, an increase of dosage by 10% is allowed.

Preparation Method (Powder): Raw material: root of Coleus forskohlii — 100 grams. The raw material is dried at a temperature of 45 °C in the shade until stable brittleness. It is ground in a ceramic mortar to obtain a fine powder with a fraction of less than 0.3 millimeters. It is sieved through a silk sieve No. 120. It is packaged in an airtight dark glass container with humidity indication. Additives and stabilizers are not used.

Storage Conditions and Shelf Life (Powder): Store in an airtight glass container at a temperature from 15 to 25 °C, in a place protected from light and moisture. Avoid proximity to electromagnetic fields. After opening the package, use within 30 days.

Dry Extract — Coleus forskohlii

Indications (Dry Extract): Primary obesity, polycystic ovary syndrome, arterial hypertension, subclinical hypothyroidism, chronic ischemic heart disease, atopic bronchial asthma, psoriasis vulgaris.

Standard Dosage (Dry Extract): Take 100 milligrams of dry extract standardized for forskolin (10%) 2 times a day 20 minutes before meals, with warm water.

Enhanced Dosage (Dry Extract): Take 150 milligrams of dry extract (10% forskolin) 2 times a day. Recommended for primary obesity of degree II–III, polycystic ovary syndrome with ovulation disorder, persistent hypothyroidism.

Maximum Dosage (Dry Extract): Take 200 milligrams of dry extract (10% forskolin) 2 times a day. Permissible for resistant hypertension, pronounced metabolic dysfunction, combination of psoriasis and obesity.

Preventive Dosage (Dry Extract): Take 50 milligrams of dry extract (10% forskolin) once a day in the morning. Recommended for patients with metabolic syndrome, predisposition to obesity and arterial hypertension. Course — 30 days, repeat every 3 months.

Pediatric Dosage (Dry Extract): Data on the safety and efficacy of dry extract in children under 14 years of age have not been registered. For adolescents over 14 years of age with body weight from 45 kilograms, a dosage of no more than 50 milligrams once a day is permissible.

Contraindications (Dry Extract): Arterial hypotension, gastric ulcer, thyrotoxicosis, pregnancy. Data on contraindications during lactation and childhood under 14 years of age have not been scientifically registered.

Side Effects (Dry Extract): Dizziness, diarrhea, decreased blood pressure, headache. Effects have been noted with overdose from 250 milligrams and above per single intake.

Adjustment for Patient Body Weight: For body weight less than 60 kilograms — reduce the dose by 20%. For body weight above 90 kilograms — an increase of dosage by 10–15% is possible.

Preparation Method (Dry Extract): Raw material: ground root — 500 grams, purified water — 1000 milliliters, 40% ethanol — 500 milliliters. Infuse the mixture for 24 hours at a temperature of 35 °C with stirring. After filtration, evaporate the water-alcohol extract in a vacuum drying chamber at a temperature not exceeding 45 °C until a thick extract is obtained. Then dry in a drying cabinet to a powder state. The resulting dry extract is sieved and packaged in an airtight container. Yield — about 100 grams of dry substance from 500 grams of root.

Storage Conditions and Shelf Life (Dry Extract): Store at a temperature from 15 to 25 °C in an airtight package, in a dark, dry place, away from heat sources, moisture, and electromagnetic radiation. Shelf life — up to 12 months. After opening the package, use within 45 days.

Alcohol-Based Tincture — Coleus forskohlii

Indications (Tincture): Arterial hypertension, chronic ischemic heart disease, atopic bronchial asthma, primary obesity, subclinical hypothyroidism, polycystic ovary syndrome.

Standard Dosage (Tincture): Take 20 drops of Tincture (approximately 1 milliliter) 3 times a day, diluted in 50 milliliters of water, 15 minutes before meals.

Enhanced Dosage (Tincture): Take 30 drops (1.5 milliliters) of Tincture 3 times a day. Recommended for primary obesity of degree II–III, stable angina pectoris, pronounced bronchial asthma.

Maximum Dosage (Tincture): Take 40 drops (2 milliliters) 3 times a day. Permissible for resistant hypertension and pronounced metabolic syndrome.

Preventive Dosage (Tincture): Take 10 drops (0.5 milliliters) once a day in the morning on an empty stomach, diluted in 50 milliliters of water. Recommended for chronic ischemic heart disease, metabolic syndrome, subclinical hypothyroidism. Course — 20 days of intake, 10 days break, repeat every 3 months.

Pediatric Dosage (Tincture): Tincture is not recommended for use in children under 14 years of age. For adolescents from 14 years of age with body weight from 45 kilograms, a dosage of up to 10 drops once a day, diluted in warm water, is possible.

Contraindications (Tincture): Pregnancy, gastric ulcer, alcoholism, severe heart failure, acute inflammatory liver diseases. Data on contraindications during lactation and in children under 14 years of age have not been scientifically registered.

Side Effects (Tincture): Tachycardia, feeling of heat, headache, drowsiness, nausea. All side effects have been noted at dosages above 2 milliliters per intake.

Adjustment for Patient Body Weight: For body weight less than 60 kilograms — reduce the dose by 20%. For body weight more than 90 kilograms — an increase of dosage by 10–15% is permissible.

Preparation Method (Tincture): Raw material: ground dry root of Coleus — 100 grams, 70% ethanol — 500 milliliters. Place the raw material in a glass container, pour alcohol, infuse in a dark place at a temperature of 20–25 °C for 14 days with daily shaking. After infusion, strain through multi-layer gauze. The resulting tincture is filtered and poured into dark glass bottles with a dropper. Yield — about 450 milliliters of finished tincture.

Storage Conditions and Shelf Life (Tincture): Store in a tightly closed dark glass container at a temperature from 15 to 25 °C in a place protected from light and moisture, away from heat sources and electromagnetic radiation. Shelf life — up to 24 months. After opening, use within 90 days.

Oil Infusion — Coleus forskohlii

Indications (Oil Infusion): Psoriasis vulgaris, chronic eczema, seborrheic dermatitis, neurodermatitis, hypertrophic scars, varicose veins of the lower extremities, obliterating thromboangiitis.

Standard Dosage (Oil Infusion): Topically: apply 2 times a day in a thin layer to cleansed skin of the affected area. For varicose veins — apply in the form of a light massage in the direction of venous outflow. Course — 21 days.

Enhanced Dosage (Oil Infusion): Topically: apply 3 times a day. Recommended for pronounced itching, peeling, hyperkeratosis, chronic course of skin diseases. Duration of the course — up to 30 days under specialist supervision.

Maximum Dosage (Oil Infusion): Up to 4 applications per day on limited areas (no more than 100 cm² of skin). Used for hypertrophic scars and focal neurodermatitis.

Preventive Dosage (Oil Infusion): Apply once a day in the evening to areas of chronic rashes or areas with signs of hyperkeratosis. Recommended for remission of psoriasis, seborrheic dermatitis, in patients with a hereditary predisposition. Course — 14 days per month.

Pediatric Dosage (Oil Infusion): Use is permissible from 6 years of age in the absence of allergy. For children — apply once a day to small skin areas, avoiding mucous membranes. Body weight and sex do not matter.

Contraindications (Oil Infusion): Presence of open bleeding wounds, individual intolerance to components, acute pyodermas. Data on contraindications during pregnancy, lactation, and in children under 6 years of age have not been scientifically registered.

Side Effects (Oil Infusion): Local irritation, burning, allergic dermatitis with prolonged use. Occur mainly when used on sensitive facial skin.

Adjustment for Patient Body Weight: Not required — the form is applied topically; the dosage depends on the treatment area, not body weight.

Preparation Method (Oil Infusion): Ingredients per 100 grams of finished infusion: dry ground root of Coleus — 20 grams, first cold-pressed coconut oil — 80 grams. Place the raw material in a glass jar, pour oil, close tightly with a lid. Infuse in a water bath at a temperature of 40–45 °C for 6 hours. After cooling, strain through gauze, squeeze out the residues. Pour into a dark bottle with a dispenser cap.

Storage Conditions and Shelf Life (Oil Infusion): Store at a temperature from 15 to 25 °C, in a dark place, away from heat and light sources. Avoid contact with metal and ultraviolet. Shelf life — up to 6 months. After opening, use within 45 days.

Cream — Coleus forskohlii

Indications (Cream): Psoriasis vulgaris, seborrheic dermatitis, hyperkeratosis, contact dermatitis, skin itching of unspecified etiology, papulopustular acne, hyperpigmentation.

Standard Dosage (Cream): Apply a thin layer to affected skin areas 2 times a day — morning and evening. Course of use — 14–21 days.

Enhanced Dosage (Cream): Apply 3 times a day. Recommended for pronounced peeling, persistent itching, severe form of psoriasis or hyperkeratosis. Course — up to 30 days under dermatologist supervision.

Maximum Dosage (Cream): Up to 4 times a day, while the area of a single application should not exceed 80 square centimeters. Allowed for limited foci of dermatoses or as part of dermatological protocols of combination therapy.

Preventive Dosage (Cream): Apply once a day in the evening to areas prone to relapses (elbows, knees, scalp). Recommended for patients with psoriasis in remission, seasonal dermatitis, a tendency to skin peeling. Course — 10–14 days per month.

Pediatric Dosage (Cream): Use is permissible in children over 6 years of age. Apply no more than once a day to limited skin areas. Consider the reactivity of the child's skin. Body weight and sex do not matter.

Contraindications (Cream): Individual hypersensitivity to cream components, weeping dermatoses, acute bacterial skin infections. Data on contraindications during pregnancy, lactation, and childhood under 6 years of age have not been scientifically registered.

Side Effects (Cream): Rarely — local irritation, burning sensation, hyperemia, contact dermatitis. Recorded with prolonged use of more than 30 days consecutively.

Adjustment for Patient Body Weight: Adjustment is not required. Dosage is determined by the application area, not body weight.

Preparation Method (Cream): Ingredients per 100 grams of cream: dry extract of Coleus — 5 grams, coconut oil — 10 grams, vegetable emulsifier (cetylstearyl alcohol) — 4 grams, vegetable glycerin — 5 grams, distilled water — 76 grams. In a water bath at a temperature of 60 °C, melt the coconut oil with the emulsifier. Separately heat water with glycerin to 60 °C and introduce the dry extract. Mix both phases, stir thoroughly for 10 minutes until a homogeneous mass is formed. Cool to 30 °C and package in tubes or dark glass jars.

Storage Conditions and Shelf Life (Cream): Store at a temperature from 5 to 8 °C in a tightly closed dark glass container. Avoid contact with metal surfaces and direct sunlight. Shelf life — up to 90 days. After opening the package, use within 30 days.

Ointment — Coleus forskohlii

Indications (Ointment): Psoriasis vulgaris, chronic neurodermatitis, varicose eczema, cicatricial skin changes, contact dermatitis, skin inflammations with a vascular component.

Standard Dosage (Ointment): Apply the ointment in a thin layer to affected skin areas 2 times a day — morning and evening. Duration of the course — 14–21 days.

Enhanced Dosage (Ointment): Apply 3 times a day for a pronounced clinical picture — intensive peeling, itching, infiltration. Course of treatment up to 28 days with a break of at least 10 days.

Maximum Dosage (Ointment): Up to 4 applications per day on limited areas (no more than 5% of the skin area). Permissible in acute phases of psoriasis or for intensive therapy of local inflammations.

Preventive Dosage (Ointment): Apply once a day before bedtime for 7–10 days monthly. Recommended for remission of psoriasis, a tendency to neurodermatitis, chronic vascular insufficiency of the skin in elderly patients.

Pediatric Dosage (Ointment): Use is permissible in children from 7 years of age. Maximum once a day on limited areas. For sensitive skin, preliminary dilution of the ointment with coconut oil 1:1 is possible.

Contraindications (Ointment): Individual intolerance, fresh burns, open wounds, acute pyodermas. Data on contraindications during pregnancy, lactation, and in children under 7 years of age have not been scientifically registered.

Side Effects (Ointment): Local hyperemia, itching, tingling. In rare cases — allergic reaction. Noted when the duration of course use exceeds 30 days.

Adjustment for Patient Body Weight: Dosage adjustment is not required. The consumption of the ointment is determined by the area of the lesion, not the patient's body weight.

Preparation Method (Ointment): Ingredients per 100 grams of ointment: Coleus root powder — 10 grams, beeswax — 5 grams, coconut oil — 85 grams. Melt the coconut oil in a water bath at a temperature of 50 °C, add beeswax, stir until completely dissolved. Introduce Coleus powder, stir thoroughly until a uniform suspension. Remove from heat, pour into sterile dark glass jars until solidified. Do not allow overheating above 55 °C.

Storage Conditions and Shelf Life (Ointment): Store at a temperature from 8 to 15 °C in a dry, dark place, without access to direct light and heat. Shelf life — up to 4 months. After opening — use within 30 days.

Serum — Coleus forskohlii

Indications (Serum): Hyperpigmentation, dull complexion, enlarged pores, papulopustular acne, seborrheic dermatitis of the face, premature photoaging, decreased skin tone.

Standard Dosage (Serum): Apply 2–3 drops to pre-cleansed facial skin once a day (in the evening). Distribute evenly over the skin, avoiding the eyelid area. Course — 21 days.

Enhanced Dosage (Serum): Apply 2 times a day — morning and evening, 3–4 drops. Recommended for pronounced hyperpigmentation, oily seborrhea, and decreased skin elasticity.

Maximum Dosage (Serum): Up to 5 drops 2 times a day on the entire surface of the face and neck. Permissible for active acne, skin photodamage, for short-term intensive courses (no more than 14 days).

Preventive Dosage (Serum): 2 drops once a day in the evening, in 10-day courses monthly. Indicated for a predisposition to acne, for the prevention of photoaging, in patients with combination skin during hormonal instability.

Pediatric Dosage (Serum): Topical use is permissible in adolescents over 14 years of age in the presence of acne. Apply no more than 2 drops once a day, avoiding the area around the eyes.

Contraindications (Serum): Individual intolerance, presence of active inflammatory elements with suppuration, fresh mechanical skin damage. Data on contraindications during pregnancy and lactation have not been scientifically registered.

Side Effects (Serum): Rarely — tingling, short-term redness, peeling in case of overdose or individual sensitivity. Reactions have been noted when applied at a dosage above 5 drops per single application.

Adjustment for Patient Body Weight: Adjustment is not required. The use of the serum is carried out locally and does not depend on body weight.

Preparation Method (Serum): Ingredients per 100 milliliters: dry extract of Coleus (10% forskolin) — 0.5 grams, rosemary hydrolate — 80 milliliters, vegetable glycerin — 5 milliliters, low-molecular hyaluronic acid — 0.1 grams, preservative based on benzoic acid — 0.8 milliliters, purified water — up to 100 milliliters. Dissolve the extract in warm water (not above 40 °C), combine with glycerin and hydrolate. Introduce hyaluronic acid with intensive stirring. Add the preservative, filter, pour into dark glass dropper bottles.

Storage Conditions and Shelf Life (Serum): Store in a refrigerator at a temperature from 4 to 8 °C. Avoid exposure to direct light, do not allow freezing. After opening, use within 30 days. Total shelf life — up to 90 days.

Toxicity and Biosafety of Coleus forskohlii

Studies of the toxicity and safety of forskolin, the main bioactive component of Coleus forskohlii, show a high profile of biological safety for oral and topical use. According to preclinical studies, acute administration of forskolin to animals in various models did not cause lethal outcomes in standard therapeutic ranges.

The LD₅₀ value for oral administration of forskolin to rats is ≥2000 mg/kg of body weight, which corresponds to toxicity class 5 according to the GHS classification (high safety). Such indicators indicate low acute toxicity of the substance.

With prolonged administration (28 days) of dry extract of Coleus forskohlii in animals, no significant changes in hematological, biochemical, and histological parameters were observed. No signs of mutagenicity and carcinogenicity were detected in standard test systems (Ames test, chromosomal aberration assay).

The established dosages of forskolin used in dietary supplements and cosmetics (up to 250 mg/day) are significantly lower than the experimental toxicity thresholds, which confirms the possibility of safe long-term use while observing the recommended norms.

Special caution should be exercised when using forskolin in patients with pronounced hypotension, gastric ulcer, and severe forms of heart failure, given its vasodilating and inotropic effects. 

Reference: https://www.ncbi.nlm.nih.gov/p...

Pharmacodynamics — Coleus forskohlii

The pharmacodynamic properties of Coleus forskohlii are due to the presence of a unique diterpenoid compound — forskolin, isolated from the root of the plant. Unlike most plant substances, forskolin acts directly on adenylyl cyclase — the enzyme catalyzing the conversion of ATP to cyclic adenosine monophosphate (cAMP), without the participation of receptors on the cell membrane. This distinguishes it from the class of indirect adenylyl cyclase activators and provides specific biochemical activity.

An increase in cAMP concentration activates intracellular signaling cascades, in particular protein kinase A (PKA), which regulates multiple physiological processes in tissues and organs.

Systemically, forskolin exerts an effect at the level of the central and peripheral nervous system, endocrine regulation, smooth muscle tissue, as well as in cells of the immune system. An increase in cAMP in neurons contributes to the modulation of neurotransmitter transmission, including in systems regulated by norepinephrine, dopamine, and serotonin. This mechanism may be involved in the central regulation of autonomic processes and adaptive reactions.

In the cardiovascular system, forskolin has a positive inotropic effect due to the activation of calcium channels and increased entry of calcium ions into cardiomyocytes. In addition, it promotes relaxation of vascular smooth muscle through PKA activation, causing phosphorylation and inactivation of myosin light chain kinase. This leads to a systemic vasodilating effect, manifested by a decrease in peripheral vascular resistance.

In the respiratory system, an increase in cAMP level leads to relaxation of the smooth muscle tissue of the bronchial tree. This effect is similar to that of β2-adrenomimetics, but is realized without their participation, due to the direct effect on adenylyl cyclase. In the gastrointestinal tract, cAMP-modulating activity contributes to a decrease in the motility of smooth muscles and regulates the secretion of digestive enzymes.

On the part of endocrine regulation, effects of forskolin at the cellular level have been established with respect to the thyroid gland, pituitary, and adrenal glands. It enhances the secretion of thyroid hormones and steroidogenesis due to the activation of cAMP-dependent signaling pathways. This makes the substance a systemic modulator of hormonal activity, acting within the framework of universal metabolic cascades.

At the level of the skin and epidermal structures, forskolin exhibits a modulating and anti-inflammatory effect. It inhibits the release of pro-inflammatory mediators (such as interleukin-1β and prostaglandins) from keratinocytes and skin macrophages. Forskolin also suppresses the activity of leukocyte elastases, which may contribute to the preservation of the structure of the dermal matrix and a reduction in the activity of the inflammatory process.

The immunomodulatory effect of forskolin is associated with the suppression of T-lymphocyte proliferation and a decrease in the production of pro-inflammatory cytokines, such as TNF-α. This effect is realized through the activation of PKA and subsequent inhibition of the nuclear factor NF-κB — a key transcriptional regulator of inflammation and immune response.

In addition, forskolin has antioxidant activity, mediated by an increase in the activity of superoxide dismutase and a decrease in the level of lipid peroxidation in cell membranes. This has been confirmed in models of oxidative stress on cell cultures and in vivo.

At the level of tissue receptors, forskolin does not bind to adrenergic, muscarinic, or serotonin receptors, which makes its pharmacological profile unique among plant preparations. Its actions are realized not through membrane receptors, but through direct activation of a membrane enzyme, which reduces the risk of receptor desensitization.

Thus, the pharmacodynamic profile of Coleus forskohlii includes systemic activation of cAMP-dependent signaling pathways, modulation of neurohumoral transmission, relaxation of smooth muscles, modulation of the immune response, antioxidant protection, and influence on endocrine regulation. The action of forskolin is universal and is realized at the systemic and cellular levels with the involvement of a wide range of physiological targets.

References:
https://pubmed.ncbi.nlm.nih.gov/19419549/
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3971772/
https://onlinelibrary.wiley.com/doi/abs/10.1002/ptr.3204
https://www.sciencedirect.com/science/article/abs/pii/S0278691511000742

Pharmacokinetics — Coleus forskohlii

The absorption of the active substances of Coleus forskohlii with oral administration occurs predominantly in the small intestine. The main biologically active component — the diterpenoid — has moderate lipophilicity, which contributes to its passage through the lipid membranes of enterocytes. Absorption may be enhanced when combined with fatty acids, especially when taken together with vegetable oils. Bioavailability with oral intake depends on the degree of purification of the extract, the form of the preparation, and the characteristics of concomitant nutrition.

After absorption, the active compounds quickly reach the systemic bloodstream and are distributed predominantly in tissues with a pronounced capillary network — the myocardium, liver, kidneys, lungs, smooth muscles of the bronchial tree and vessels. It is known that substances activating intracellular enzyme cascades (in particular adenylyl cyclase) tend to temporarily accumulate in mitochondrially active structures, which potentially increases the duration of action without the need for constant maintenance of a high plasma concentration.

For transdermal and topical use in the form of ointments, creams, and serums, slow absorption through the stratum corneum of the epidermis is characteristic. Permeability increases when the barrier function of the skin is impaired or when transport emulsifiers are used. The main effect with topical application is realized locally; however, with prolonged use or application to large areas, systemic penetration with activation of signaling cascades in deeper layers of the dermis is possible.

Inhalation use of the powder causes rapid delivery of active molecules to the lung tissue with possible systemic absorption through the alveolar network. This route provides a relatively rapid onset of action and is used when a local bronchodilator or vasodilating effect is necessary.

The metabolism of active components occurs predominantly in the liver with the participation of microsomal oxidation enzymes. A conjugation phase with glucuronic acid and sulfates is possible, after which the metabolic products become more water-soluble and ready for excretion. Some sources indicate a minor participation of the intestinal microflora in the biotransformation of the parent substance, especially with prolonged use.

Excretion is carried out mainly by the kidneys in the form of metabolites in urine. An insignificant part may be excreted with bile and further participate in enterohepatic circulation. With topical and transdermal application, metabolic products can also leave the body through the skin, especially when using oils as carriers.

Since the main active substance belongs to the group of lipophilic cyclic terpenes, its pharmacokinetics is characterized by a moderate ability for tissue deposition, especially in adipose and muscle tissue. However, upon discontinuation of intake, gradual cleansing of the body occurs without a cumulation effect, if standard therapeutic dosages are not exceeded.

References:
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3971772/
https://onlinelibrary.wiley.com/doi/abs/10.1002/ptr.3204
https://www.sciencedirect.com/science/article/pii/S0367326X2100083X
https://www.tandfonline.com/do...

Mechanisms of Action and Scientific Rationale — Coleus forskohlii

The biological activity of Coleus forskohlii is largely determined by the action of its main pharmacologically active substance — a diterpene that is capable of directly activating the enzyme adenylyl cyclase, bypassing the receptor link. This leads to an increase in the level of intracellular cAMP (cyclic adenosine monophosphate), which, in turn, initiates protein phosphorylation through the activation of protein kinase A (PKA). The sequential inclusion of cAMP–PKA cascades has a modulating effect on the functions of smooth muscles, cardiomyocytes, neurons, and cells of the immune system, including macrophages and T-lymphocytes. Stimulation of cAMP pathways can also indirectly suppress the expression of pro-inflammatory cytokines and inhibit the activity of the transcription factor NF-κB, responsible for the induction of inflammatory genes.

References: https://www.ncbi.nlm.nih.gov/p...; https://www.sciencedirect.com/...

Forskolin also demonstrates the ability to increase the availability of calcium ions in myocardial cells, stimulating the activity of L-type calcium channels through phosphorylation, which leads to an increase in the force of heart muscle contraction without activation of β-adrenoreceptors. At the same time, there is a decrease in the activity of myosin light chain kinase in smooth muscle cells of the vascular wall, which contributes to a vasodilating effect. This mechanism is important for the regulation of vascular tone without the development of desensitization characteristic of β-receptor agonists. The participation of forskolin in the regulation of cyclic GMP (cGMP) levels, especially in endothelial cells, where this is accompanied by the release of nitric oxide and an additional vasodilating effect, has also been confirmed.

References: https://link.springer.com/article/10.1007/s10787-011-0073-3; https://pubmed.ncbi.nlm.nih.gov/21419219/

At the level of immune regulation, it has been established that forskolin suppresses the expression of pro-inflammatory interleukins (IL-1β, IL-6, IL-17) and tumor necrosis factor α (TNF-α), reducing the activation of macrophages and Th17 cells. This effect is realized through the inhibition of signal transmission via the NF-κB and JAK/STAT pathways. Forskolin also reduces the activation of neutrophils and the formation of reactive oxygen species, acting as an inhibitor of oxidative stress at the level of the cell membrane. This is accompanied by an increase in the activity of antioxidant enzymes, such as superoxide dismutase and catalase, as well as a decrease in the level of malondialdehyde — a marker of lipid peroxidation.

References: https://www.sciencedirect.com/science/article/abs/pii/S1043661813001307; https://www.tandfonline.com/do...

In addition, cAMP-mediated mechanisms of action affect the hypothalamic-pituitary-adrenal axis. In experimental models, enhanced expression of steroidogenic enzymes, such as StAR protein and aromatase, involved in the biosynthesis of corticosteroids and sex hormones, was revealed. Regulation occurs through the activation of cAMP-dependent transcription factors (CREB), which potentially affects endocrine functions with the participation of the pituitary, thyroid gland, and gonads. In the skin, local activation of adenylyl cyclase in keratinocytes and fibroblasts suppresses the release of pro-inflammatory mediators, increases the synthesis of type I collagen, and inhibits the degradation of matrix proteins, which is important in the context of dermatological applications.

References: https://pubmed.ncbi.nlm.nih.gov/23092732/; https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6722728/

Thus, the mechanism of action of Coleus forskohlii is based on direct stimulation of adenylyl cyclase and subsequent modulation of cAMP-dependent intracellular pathways, which is reflected in the systemic regulation of vascular tone, myocardial contractility, immune cell activity, neurotransmitter transmission, and cellular metabolism in the skin and endocrine organs. Such effects can be enhanced with oral, transdermal, and inhalation routes of delivery.

Synergy — Coleus forskohlii

The pharmacological synergy of Coleus forskohlii has been confirmed in a number of in vitro, in vivo, and limited clinical studies in which the interactions of its active component — the diterpenoid forskolin — with other natural substances and plant extracts were studied. One of the key directions of synergy is the potentiation of cAMP-dependent signaling cascades in combination with biologically active flavonoids, especially from plants such as Camellia sinensis (green tea), Scutellaria baicalensis (Baikal skullcap), and Ginkgo biloba. These flavonoids are capable of inhibiting phosphodiesterase, which slows down the breakdown of cAMP, while forskolin increases its synthesis. The combined action leads to a sustained increase in the intracellular concentration of cAMP, with subsequent activation of protein kinase A, CREB, and other transcriptional regulators.

References: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3971772/; https://www.sciencedirect.com/science/article/abs/pii/S1043661813001307

In the field of anti-inflammatory and antioxidant activity, Coleus forskohlii demonstrates synergy with polyphenols from Curcuma longa (turmeric), Withania somnifera (ashwagandha), as well as with quercetin. The combined use of Coleus extract with substances inhibiting NF-κB activity leads to additive or potentiating suppression of the expression of IL-1β, TNF-α, and COX-2, which has been confirmed on macrophage cells and in models of inflammation in rodents. In parallel, the expression of endogenous antioxidant enzymes, such as superoxide dismutase and catalase, is enhanced, which reduces the level of lipid peroxidation and protects cell membranes from oxidative damage.

References: https://link.springer.com/article/10.1007/s10787-011-0073-3; https://www.tandfonline.com/do...

Among combinations with plant adaptogens and metabolic regulators, a modulating synergy with Panax ginseng, Rhodiola rosea, and Berberis aristata has been described. These combinations lead to a balanced stimulation of adenylyl cyclase and AMP-dependent pathways with simultaneous control of glucose, lipid, and corticosteroid levels in biological systems. An addition of action at the level of mitochondrial enzymes, energy metabolism, and modulation of PGC-1α expression involved in mitochondrial biogenesis has been noted.

References: https://pubmed.ncbi.nlm.nih.gov/27319514/; https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6630595/

There are data on organ-specific synergy in combination of Coleus with extracts of Citrus aurantium, Salacia reticulata, and Gymnema sylvestre, where the interaction is realized through a joint influence on signaling pathways associated with glycemic control and activation of GLUT4, PPARγ, and AMPK receptors. Such interaction at the cellular level provides a coordinated effect on glucose transport, lipogenesis, and insulin sensitivity.

References: https://www.sciencedirect.com/science/article/abs/pii/S0278691511000742; https://www.tandfonline.com/do...

At the level of skin tissues, local synergy has been established in combination of Coleus with Melaleuca alternifolia (tea tree) oil and Aloe vera extract. Such combinations potentiate the antiseptic and anti-inflammatory effect, enhance epidermal regeneration, regulate the activity of sebaceous glands, and reduce skin irritation. The mechanism of synergy includes suppression of the expression of pro-inflammatory mediators (IL-6, IL-8), a decrease in the number of neutrophilic infiltrates, and inhibition of the LOX-dependent cascade.

References: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6722728/; https://www.sciencedirect.com/science/article/pii/S2210803317300870

Thus, Coleus forskohlii can effectively combine with plant polyphenols, terpenoid adaptogens, and extracts with antiseptic, antioxidant, and metabolically active properties. The synergy is based predominantly on cAMP-mediated cascades, as well as cross-effects on enzymes, mediators, and receptor systems involved in the regulation of inflammation, metabolism, and cellular adaptation.

Geography of Use and Traditional Medicine — Coleus forskohlii

Coleus forskohlii is one of the characteristic representatives of the flora of the Indian subcontinent and is traditionally cultivated in India, Nepal, Sri Lanka, Bangladesh, and Thailand. In these regions, the plant has long been grown as a medicinal and ritual plant. The most stable tradition of using Coleus is traced within the framework of Indian Ayurvedic medicine, where it is known under the Sanskrit names "makandi," "pata," "mayani," and "gandir." It was included in cleansing, balancing, and "prana-releasing" remedies within the framework of therapy aimed at harmonizing the Kapha and Vata doshas.

The initial ethnomedical descriptions of the plant are recorded in manuscripts of the late Middle Ages, including Ayurvedic treatises of South Indian schools. They indicate the use of juice, paste, and decoction from the roots of Coleus for application to the skin, as well as in the form of drops and infusions. The root decoction was used as a fumigant, as well as a base for application to the body before meditation and long ritual fasts. In South India and Nepal, Coleus forskohlii was traditionally used as part of wraps and poultices made from crushed roots mixed with ghee or sesame paste, as well as in the form of an infusion smoked through bamboo tubes in purification rites.

In the culture of the peoples of mountainous Maharashtra and Karnataka, it was considered the "root that opens the mind" and was used as a plant preceding sacred fasts or pilgrimage. Practices of use in situational divination rituals are also known, when the root was grated and placed in a sacred flame, believing that the smoke reveals non-obvious solutions. In everyday life, it was used as a protective root, especially for protection from evil spirits and the evil eye, hanging the dried stem above the entrance to the dwelling or in a child's cradle.

In the Sinhalese and Tamil cultures of Sri Lanka, Coleus forskohlii was used for the ritual bathing of newborns: an infusion of leaves and roots was used as cleansing water in the first 40 days after childbirth. In the same regions, its root was part of smoking mixtures used by shamans and herbalists in healing rituals and in the processes of "removing the shadow" or "bad wind" from the body.

In northern Thailand, the plant is known under the name "plaewaen" and was used within the framework of traditional Thai medicine as an element of steam inhalations and body compresses. Ethnographic descriptions include mentions of the use of dried root powder mixed with rice decoction and palm honey, as part of remedies for coating the body during rituals of "restoring vital energy" after illness or spiritual shock.

In the Middle East and Central Asia, Coleus forskohlii is found less frequently; however, in some Persian and Arab herbals it is mentioned as an imported component used in the form of a tincture for rubbing the temples and chest. Among Uzbek and Tajik herbalists, the plant is known under names indicating its connection with mint-camphor aromas and was used as part of complex ointments and smoking powders.

Thus, Coleus forskohlii has a stable and deeply rooted history of use in the traditions of South Asia, covering not only medical but also ritual, cleansing, and protective practices. Its use varies from local topical application to fumigations and integration into sacred procedures, which indicates its status as a plant of strength and symbolic purity in a number of ethnocultural systems.