Salix alba (White Willow), Bark

Salix alba (White Willow), Bark

Product Name: Ива белая, Salix alba, Silber-Weide, Sauce blanco, Saule blanche, الصفصاف الأبيض, หญ้าหางนกยูงขาว, Oq terak, Ак тал, Ağ söyüd, Сафед бед, Baltoji gluosnis, Baltā vītola, Біла верба, לבנה הערבה

Synonyms: Ива серебристая, белая верба, серебристая верба, белая лоза, willow bark, white willow, Weidenrinde, corteza de sauce, écorce de saule, لحاء الصفصاف, เปลือกต้นหลิวขาว

Main Indications for the Use of Salix alba: Osteoarthritis, rheumatoid arthritis, tendinitis, bursitis, lumbago, myalgia, tension headache, dysmenorrhea, fever, influenza, infectious diseases of the upper respiratory tract, hyperthermia, gout, fibromyalgia.

Use of Salix alba in Mixtures and Complexes: Degenerative-dystrophic diseases of the spine, radiculopathy, vascular encephalopathies, chronic cystitis, chronic prostatitis, tubulointerstitial nephritis, neurovegetative syndromes, arterial hypertension.

Pharmacological Properties of Salix alba: Antipyretic, analgesic, anti-inflammatory, antirheumatic, sedative, antiplatelet, vessel-strengthening, immunomodulatory, antioxidant, antibacterial, hepatoprotective, cytoprotective, diuretic, spasmolytic, astringent, deodorizing.

Dosage of Pharmaceutical Forms — Salix alba

Powder — Salix alba

Indications (Powder): Osteoarthritis, rheumatoid arthritis, myalgia, tension headache, dysmenorrhea, fever, hyperthermia, tendinitis, gout, fibromyalgia.

Standard Dosage (Powder): 1 gram of powder 2 times a day, with warm water, 30 minutes before meals. Duration of intake — up to 14 days.

Enhanced Dosage (Powder): 1.5 grams of powder 3 times a day for 10 days for acute inflammatory joint diseases, fever, and pronounced myalgia.

Maximum Dosage (Powder): Do not exceed 6 grams of powder per day. Allowed for no more than 3 days for fever, infectious diseases of the upper respiratory tract, and pronounced pain syndrome.

Preventive Dosage (Powder): 0.5 grams of powder once a day in the morning on an empty stomach. Recommended for chronic osteoarthritis, recurrent bursitis, a tendency to gout, patients over 60 years of age — in courses of 10 days once a month.

Pediatric Dosage (Powder): Use is allowed from 12 years of age, with a body weight of 40 kg or more. 250 mg of powder 1–2 times a day, no more than 5 days in a row. For children under 12 years of age, scientific safety data have not been registered.

Contraindications (Powder): Hypersensitivity to salicylates, gastric ulcer, hemorrhagic diathesis, bronchial asthma, simultaneous use of anticoagulants. Data on contraindications during pregnancy, lactation, and in children under 12 years of age have not been scientifically registered.

Side Effects (Powder): Gastralgia, dyspepsia, heartburn, headache, skin rash. With overdose — nausea, tinnitus, irritability, drowsiness.

Adjustment for Patient Body Weight (Powder): Patients with body weight up to 60 kg — reduce the dosage by 25%. Patients with body weight over 90 kg — an increase in dosage by 20% is allowed under medical supervision.

Preparation method (Powder): Take 100 grams of dry white willow bark, cleaned of the outer woody shell. Dry at a temperature not exceeding 40 °C in the shade until brittle. Grind to a powder using a ceramic mortar or a low-speed mill. Sift through a sieve with a mesh size of 0.5 mm. Package in a dark, airtight container.

Storage Conditions and Shelf Life (Powder): Store in a tightly closed dark glass or metal container, at a temperature of 5 to 25 °C, in a dry, dark place, shielded from electromagnetic radiation. Shelf life — up to 24 months. After opening, use within 90 days.

Dry Extract — Salix alba

Indications (Dry Extract): Osteoarthritis, rheumatoid arthritis, myalgia, tension headache, dysmenorrhea, inflammatory joint diseases, gout.

Standard Dosage (Dry Extract): 240–360 mg of standardized dry extract calculated as 15% salicin-like substances once a day, orally after meals. Duration of course — up to 21 days.

Enhanced Dosage (Dry Extract): Up to 480 mg of dry extract once a day for exacerbation of chronic arthritis, pronounced pain syndrome in osteoarthritis, and tendinitis. Course no more than 10 days.

Maximum Dosage (Dry Extract): Up to 600 mg of extract per day. Allowed short-term (no more than 3 days) for severe fever or acute inflammatory joint diseases.

Preventive Dosage (Dry Extract): 120 mg of dry extract once every 2 days for 14 days, repeat the course monthly. Recommended for chronic inflammatory joint diseases, hyperthermic syndromes in elderly patients, and perimenopausal women with a tendency to edema syndrome.

Pediatric Dosage (Dry Extract): Not recommended for children under 12 years of age. From 12 years — 120 mg once a day, with a body weight of 40 kg or more. Safety data for younger children are absent.

Contraindications (Dry Extract): Peptic ulcer, Reye's syndrome, hypersensitivity to salicylates, severe liver or renal failure, pregnancy, lactation. In children under 12 years of age — not recommended.

Side Effects (Dry Extract): Nausea, irritation of the gastric mucosa, allergic reactions, tinnitus, dizziness with overdose.

Adjustment for Patient Body Weight (Dry Extract): Patients with body weight below 60 kg — reduce the dose by 20%. For body weight over 90 kg — an increase to 480–600 mg per day is possible with good tolerability.

Preparation method (Dry Extract): Take 100 grams of ground white willow bark. Pour 1 liter of 70% ethanol. Infuse at a temperature of 40 °C for 72 hours with periodic stirring. Then filter and evaporate at a temperature of 40 °C under vacuum to a thick mass. Dry to a dry residue, grind to a powder. Standardize the finished dry extract according to salicin content (not less than 15%).

Storage Conditions and Shelf Life (Dry Extract): Store in airtight packaging made of light-proof material, at a temperature of 10 to 25 °C, in a dry place. Shield from sources of EMI. Shelf life — up to 36 months. After opening, use within 90 days.

Alcohol-Based Tincture — Salix alba

Indications (Tincture): Osteoarthritis, rheumatoid arthritis, gout, myalgia, fever, infectious diseases of the upper respiratory tract, algodysmenorrhea.

Standard Dosage (Tincture): 20 drops of tincture (equivalent to ~1 ml) 3 times a day, diluted in 50 ml of water, 30 minutes before meals. Course — up to 14 days.

Enhanced Dosage (Tincture): 30 drops 3 times a day, for pronounced pain syndrome, fever, and exacerbation of rheumatic diseases. Duration — no more than 7 days.

Maximum Dosage (Tincture): Up to 40 drops 3 times a day (120 drops per day) allowed short-term (up to 3 days) for acute inflammatory joint diseases and febrile temperature above 38.5 °C.

Preventive Dosage (Tincture): 10 drops once a day, in courses of 7 days per month. Recommended for chronic osteoarthritis, recurrent cystitis, a tendency to hyperthermia, and patients over 50 years of age in the autumn-winter period.

Pediatric Dosage (Tincture): Use is allowed from 12 years of age, 5–10 drops 1–2 times a day, pre-diluted with water. With a body weight of 40 kg or more. For younger children — safety data are absent.

Contraindications (Tincture): Liver diseases, alcoholism, epilepsy, pregnancy, lactation, gastric and duodenal ulcers. Data on contraindications in children under 12 years of age are absent.

Side Effects (Tincture): Heartburn, irritation of the gastric mucosa, headache, drowsiness, nausea, allergic reactions. In rare cases — dizziness and tinnitus.

Adjustment for Patient Body Weight (Tincture): Patients with body weight below 60 kg — reduce the dose by 25%. For body weight over 90 kg — an increase in dose by 20% is possible with good tolerability.

Preparation method (Tincture): Take 100 grams of ground dry white willow bark, pour 500 ml of 70% ethyl alcohol. Infuse in a dark glass container at room temperature (18–22 °C) for 14 days, shaking periodically. Then filter through gauze or a funnel with cotton wool, squeeze out the raw material. Store in a dark bottle with a tightly closed lid.

Storage Conditions and Shelf Life (Tincture): Store in a cool, light-protected place away from electromagnetic sources at a temperature of 8 to 18 °C. Shelf life — up to 3 years. After opening, use within 90 days.

Oil Infusion — Salix alba

Indications (Oil Infusion): Myalgia, osteoarthritis, arthralgia, rheumatism, bursitis, fibromyalgia, skin inflammations, varicose eczema.

Standard Dosage (Oil Infusion): Externally apply a thin layer 2 times a day to the affected area. Volume per application — about 5 ml.

Enhanced Dosage (Oil Infusion): Apply up to 3 times a day, for pronounced joint inflammation, exacerbation of rheumatic pain, and edema.

Maximum Dosage (Oil Infusion): Up to 20 ml per day on extensive areas of application for multiple foci of arthralgia and myositis. Use no more than 7 days in a row.

Preventive Dosage (Oil Infusion): Apply once a day in the evening for 10–14 days during periods of increased physical activity, chronic joint pain in the elderly, and patients with venous outflow disorders.

Pediatric Dosage (Oil Infusion): Allowed from 6 years of age in the absence of allergies: apply once a day to a limited area of skin (no more than 3×3 cm), in a volume of up to 2 ml. For children under 6 years of age — not recommended.

Contraindications (Oil Infusion): Violation of skin integrity, purulent skin diseases, individual intolerance. Data on contraindications during pregnancy, lactation, and in children under 6 years of age have not been registered.

Side Effects (Oil Infusion): Local allergic reactions: itching, redness, rash. If it gets on mucous membranes, irritation and burning are possible.

Adjustment for Patient Body Weight (Oil Infusion): Not required, as the drug is applied externally. Correction may be required for the area of the lesion: in patients with low body weight — reduce the volume of application.

Preparation method (Oil Infusion): Take 20 grams of dry ground white willow bark, pour 100 ml of unrefined coconut oil. Place in a glass jar with a tight lid. Keep in a water bath at a temperature of 45–50 °C for 3 hours, stirring occasionally. Then infuse for 48 hours in a dark place, filter, squeeze out the raw material. Store in a dark bottle.

Storage Conditions and Shelf Life (Oil Infusion): Store at a temperature of 10 to 25 °C, in a dark glass container, shielded from sources of EMI and sunlight. Shelf life — up to 12 months. After opening, use within 60 days.

Ointment — Salix alba

Indications (Ointment): Osteoarthritis, rheumatoid arthritis, tendinitis, myalgia, lumbago, neuralgia, fibromyalgia, varicose veins, trophic skin inflammations.

Standard Dosage (Ointment): Externally apply 2 times a day to pre-cleansed skin in the area of inflammation. Volume of application — 2–3 grams of ointment per joint or area.

Enhanced Dosage (Ointment): Up to 3–4 times a day for pronounced pain, edema, nocturnal joint pain, and acute rheumatic processes. Duration of enhanced use — no more than 7 days.

Maximum Dosage (Ointment): Up to 15 grams per day (approximately 1 tablespoon) for multiple lesions of large joints. Use no more than 5 days in a row.

Preventive Dosage (Ointment): Once a day at night for 7–10 days during periods of exacerbation of chronic joint diseases, with weather sensitivity, and physical overwork. Recommended for patients with osteoarthritis, bursitis, myalgia, and varicose veins.

Pediatric Dosage (Ointment): Allowed from 6 years of age, volume — up to 1 gram of ointment once a day. Apply to limited areas (no more than 5×5 cm). For children under 6 years of age — contraindicated due to possible sensitization.

Contraindications (Ointment): Purulent inflammatory skin diseases, allergic dermatitis, eczema in the acute stage, individual intolerance. Contraindications during pregnancy and lactation with external use have not been scientifically registered.

Side Effects (Ointment): Skin rash, redness, burning, contact dermatitis. With prolonged use on large areas — risk of systemic absorption and nausea.

Adjustment for Patient Body Weight (Ointment): Not required for local application. For body weight less than 50 kg, reduce the area of application. For weight over 100 kg — the dosage is not adjusted, depends on the affected area.

Preparation method (Ointment): Take: 20 grams of dry white willow extract, 60 grams of coconut oil, 15 grams of beeswax, 5 grams of lanolin. Melt the oil in a water bath at a temperature of 45 °C, add wax and lanolin. After complete dissolution, add the extract and mix thoroughly until homogeneous. Pour into containers and cool.

Storage Conditions and Shelf Life (Ointment): Store in a tightly closed dark glass container at a temperature of 5 to 20 °C. Avoid direct sunlight and exposure to EMI. Shelf life — up to 12 months. After opening, use within 60 days.

Cream — Salix alba

Indications (Cream): Atopic dermatitis, acne, seborrheic dermatitis, skin irritation, vascular network, couperose, varicose eczema, hyperkeratosis.

Standard Dosage (Cream): Apply to cleansed skin 2 times a day (morning and evening) in a thin layer to affected areas. Volume — 1–2 ml per application.

Enhanced Dosage (Cream): Up to 3 times a day for pronounced skin inflammation, itching, redness, and edema. Use up to 7 days in a row.

Maximum Dosage (Cream): Up to 10 ml of cream per day. No more than 5 days for acute conditions. Application to large areas of skin requires medical supervision.

Preventive Dosage (Cream): Once a day in the evening, in courses of 10 days once a month. Recommended for chronic skin diseases, a tendency to clogged pores, and patients with sensitive skin.

Pediatric Dosage (Cream): Allowed from 3 years of age. Apply once a day, no more than 0.5 ml per application. Do not use in children under 3 years of age.

Contraindications (Cream): Open wounds, weeping dermatitis, individual intolerance. During pregnancy and lactation, external use is allowed; data on contraindications have not been registered.

Side Effects (Cream): Skin irritation, flaking, urticaria. With prolonged use — dry skin, allergic reactions.

Adjustment for Patient Body Weight (Cream): Adjustment is not required. In children and persons with low body weight — reduction of the area of application.

Preparation method (Cream): Aqueous phase: 65 ml of distilled water, 2 grams of glycerin. Fatty phase: 20 ml of coconut oil, 5 grams of emulsifier (cetyl alcohol), 5 grams of dry white willow extract. Heat both phases to 60 °C, pour the aqueous phase into the fatty phase with constant stirring, cool to room temperature. Stir until a stable emulsion is formed.

Storage Conditions and Shelf Life (Cream): Store in the refrigerator (5 to 10 °C), in airtight packaging, away from sources of light and EMI. Shelf life — 30 days. After opening, use within 14 days.

Serum — Salix alba

Indications (Serum): Acne, comedonal rash, post-inflammatory hyperpigmentation, rosacea, oily seborrhea, folliculitis, hyperkeratosis, enlarged pores.

Standard Dosage (Serum): Apply 1–2 drops of serum to cleansed facial skin 1–2 times a day. Avoid the eye area. Course — up to 21 days.

Enhanced Dosage (Serum): Apply 3 times a day to inflamed skin areas for acute inflammation and multiple acneiform eruptions. Duration — no more than 7 days.

Maximum Dosage (Serum): Up to 6 drops of serum per day on the entire surface of the face. Do not use more than 5 days in a row at this dose.

Preventive Dosage (Serum): Once a day in the evening in a volume of 1–2 drops. Recommended for patients with oily and combination skin prone to clogged pores, adolescents during puberty, and women with premenstrual acne exacerbations. Course — 10 days per month.

Pediatric Dosage (Serum): From 10 years of age. Apply pointwise once a day, no more than 1 drop. Use in children under 10 years of age is not recommended.

Contraindications (Serum): Individual intolerance, fresh skin damage, exudative rashes. Data on contraindications during pregnancy and lactation are absent; use with caution.

Side Effects (Serum): Short-term burning, redness, irritation, skin flaking. An allergic reaction is possible.

Adjustment for Patient Body Weight (Serum): Dose adjustment is not required, applied externally in a small volume.

Preparation method (Serum): Aqueous base: 70 ml of witch hazel hydrolate, 10 ml of aloe vera juice. Active phase: 5 ml of glycerin extract of white willow, 2 ml of panthenol, 2 ml of niacinamide, 0.5 ml of tea tree essential oil. Preservative: 0.5 ml of rosemary extract. Mix at a temperature of 25–30 °C, mix thoroughly until homogeneous, pour into opaque bottles with a pipette.

Storage Conditions and Shelf Life (Serum): Store at a temperature of 5 to 10 °C in dark packaging. Shield from light and EMI. Shelf life — up to 30 days. After opening, use within 14 days.

Toner — Salix alba

Indications (Toner): Oily and problem skin, seborrheic dermatitis, hyperkeratosis, dull complexion, skin irritation, actinic keratosis.

Standard Dosage (Toner): Wipe the facial skin 1–2 times a day with a cotton pad moistened with toner. Volume — 3–5 ml per application. Course — up to 14 days.

Enhanced Dosage (Toner): Up to 3 times a day for acute inflammation, irritation, and oily shine. No more than 7 days in a row.

Maximum Dosage (Toner): Up to 15 ml per day. Use on limited areas of the face and neck. Do not use more than 5 days in a row.

Preventive Dosage (Toner): Once a day in the evening, in courses of 7–10 days. Recommended for adolescents, patients with combination and oily skin, and women with impaired skin barrier.

Pediatric Dosage (Toner): From 8 years of age. Once a day, no more than 1–2 ml, wipe the face with a soft cotton pad. If irritation occurs — discontinue use.

Contraindications (Toner): Hypersensitivity, weeping eczema, acute dermatoses, allergy to salicylates. During pregnancy and lactation — external use is allowed.

Side Effects (Toner): Flaking, redness, burning of the skin, increased sensitivity to the sun.

Adjustment for Patient Body Weight (Toner): Adjustment is not required, applied externally in small doses.

Preparation method (Toner): Composition per 100 ml: 60 ml of distilled water, 30 ml of witch hazel hydrolate, 5 ml of aqueous white willow extract, 3 ml of apple cider vinegar (natural), 1 ml of cucumber extract, 1 ml of preservative agent (rosemary extract). Mix all ingredients in a sterile container at room temperature, filter, pour into spray bottles.

Storage Conditions and Shelf Life (Toner): Store at a temperature of 5–10 °C in a dark glass bottle with a tightly closed lid. Shield from sunlight and EMI. After opening, use within 20 days. Total shelf life — up to 60 days.

Toxicity and Biosafety of Salix alba

White willow bark (Salix alba) demonstrates a high biosafety profile upon oral and external use in therapeutic doses. The main active substance is considered to be salicin — a natural precursor of salicylic acid. Unlike synthetic salicylates, salicin in willow bark is metabolized more slowly, which reduces the risk of acute toxic effects.

In a toxicological assessment study of white willow extract on mice and rats, conducted in accordance with OECD Guidelines, it was established that the acute oral toxicity LD₅₀ value of Salix alba bark extract is more than 5000 mg/kg body weight in rats, which indicates extremely low toxicity of the substance.

With external use on the skin, no signs of irritation, photosensitization, or cumulative toxicity have been detected. There are isolated reports of possible allergic reactions in individuals with intolerance to salicylates.

White willow extracts do not exhibit mutagenicity, cytotoxicity, or embryotoxicity in standard in vitro and in vivo test systems. Modern pharmacological reviews classify Salix alba as a non-toxic herbal preparation with a favorable safety index.

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

Pharmacodynamics — Salix alba

The pharmacodynamic properties of white willow are due to a complex of phenolic compounds, among which the main active component is considered to be salicin. After metabolic transformation, salicin exerts a pronounced inhibitory effect on the enzyme cyclooxygenase (COX), which leads to a decrease in the biosynthesis of prostaglandins — mediators of the inflammatory response. This underlies the anti-inflammatory, analgesic, and antipyretic action of the plant. In addition to salicin, flavonoids, catechins, and polyphenols, which possess membrane-stabilizing and antioxidant potential, are considered pharmacologically active.

The antioxidant effect of white willow is realized primarily through the neutralization of reactive oxygen species (ROS) and suppression of oxidative stress. Flavonoid fractions interact with peroxide radicals and suppress lipid peroxidation, stabilizing cellular and mitochondrial membranes. This action is manifested at both the systemic and cellular levels.

Experimental in vitro and in vivo data indicate the ability of white willow to modulate the activity of pro-inflammatory cytokines, including interleukin-6 (IL-6), tumor necrosis factor-alpha (TNF-α), and interleukin-1β (IL-1β). This confirms its effect on the immune system, especially in the aspect of regulation of the innate inflammatory response. At the level of systemic immune regulation, white willow can reduce hyperactivity of neutrophils and monocytes mediated through prostanoid cascades.

From the nervous system, sedative and mild analgesic effects have been described, which are associated with the cumulative action of polyphenols and flavonoids, as well as their ability to reduce peripheral pain receptor sensitivity. A decrease in impulse transmission along nociceptive pathways due to suppression of prostaglandin E2 production in tissues has been established.

The effect of white willow components on vascular tone, realized through antiplatelet activity, has also been described. Suppression of platelet aggregation and a decrease in thromboxane A2 activity may be explained by the presence of salicylate derivatives, which potentially affect microcirculatory regulation.

The presence of tannins and condensed catechins provides astringent, moderately antimicrobial, and dermatoprotective action with local application. This is associated with the precipitation of proteins on the surface of mucous membranes and skin, the formation of a protective film, and a decrease in capillary permeability.

Thus, the pharmacodynamics of white willow covers several targets: enzymatic (COX-1, COX-2), mediator (prostaglandins, thromboxanes), cellular (neutrophils, platelets), and tissue (endothelium, skin, mucous membranes). The effects are realized mainly at the systemic and local levels.

References:
https://www.ncbi.nlm.nih.gov/p...
https://www.sciencedirect.com/science/article/pii/S0378874110000740

Pharmacokinetics — Salix alba

The pharmacokinetics of the active substances of white willow is determined by the physicochemical properties of salicin and associated polyphenolic components. Upon oral administration, salicin in unchanged form passes through the stomach and is absorbed in the small intestine, where it undergoes hydrolysis by microflora with the formation of saligenin. The latter is oxidized in the liver to salicylic acid — the main biologically active metabolite. This biotransformation pathway determines the delayed and mild pharmacological action compared to synthetic salicylates.

The entry of active substances into the systemic circulation occurs primarily through the portal vein, with the first metabolic passage through the liver. The distribution of metabolites occurs evenly, with accumulation in tissues with a high degree of inflammation and oxidative stress. Due to low lipophilicity, the main metabolite — salicylic acid — penetrates poorly through the blood-brain barrier but exhibits activity in peripheral tissues.

Flavonoids, catechins, and phenolic acids contained in the bark also undergo metabolism in the liver with the participation of phases I and II, including glucuronidation and sulfation reactions. These compounds may partially undergo enterohepatic circulation, which increases the duration of their action.

With transdermal and local application, the absorption of active substances is limited by the stratum corneum of the skin. However, due to the high biological activity of polyphenolic components, a local anti-inflammatory and antioxidant effect is achieved. Permeability may be enhanced when the skin barrier function is impaired, which requires caution.

Through the mucous membranes of the oral cavity and vagina, willow components are absorbed rapidly, bypassing the first hepatic metabolism. This is used for local and systemic effects in certain forms of application.

Excretion of active metabolites is carried out primarily by the kidneys in the form of free and conjugated forms. An insignificant part is excreted with bile and then through the intestines. The participation of the lungs and skin in the excretion of components is minimal and clinically insignificant.

Thus, the pharmacokinetics of white willow is characterized by moderate absorption, active metabolism in the liver, systemic distribution, and predominantly renal excretion. The form of administration and the structure of the matrix (powder, extract, infusion) play an important role in bioavailability.

References:
https://pubmed.ncbi.nlm.nih.go...
https://www.sciencedirect.com/science/article/abs/pii/S0367326X19302463

Mechanisms of Action and Scientific Rationale — Salix alba

The biological activity of white willow bark is realized through the interaction of a complex of phenolic compounds (primarily salicin and polyphenols) with enzymatic, mediator, and receptor systems of the body. The key mechanism of action is the inhibition of the enzyme cyclooxygenase (COX-1 and COX-2), which leads to a decrease in the synthesis of prostaglandins — mediators of the inflammatory response, pain, and fever. This inhibition is carried out through the active metabolite of salicin — salicylic acid, formed in the body after metabolic transformation.

At the molecular level, salicin-like compounds suppress the activity of inflammatory signaling cascades, including the nuclear factor NF-κB, responsible for the transcription of pro-inflammatory genes, and the enzyme lipoxygenase (LOX), involved in the synthesis of leukotrienes. This leads to a decrease in the expression of cytokines IL-1β, IL-6, and TNF-α in macrophages and monocytes, reducing the local and systemic inflammatory response. The ability of willow extracts to suppress oxidative stress through modulation of reactive oxygen species (ROS) production and restoration of antioxidant balance at the level of the glutathione system and superoxide dismutase (SOD) has also been noted.

The flavonoid components of white willow have an additional effect on the activity of cellular enzyme systems. In particular, catechins and quercetin are able to inhibit tyrosine kinase, suppressing the activation of the MAPK cascade, and also reduce the expression of adhesion molecules in vascular endothelial cells, which reduces inflammation and vascular permeability. This action has been confirmed in experiments on endothelial cell lines and corresponds to the mechanism of tissue-specific protection of the vascular wall.

Individual studies indicate antiproliferative and modulating properties of white willow, due to the interaction of flavonoids with the aryl hydrocarbon receptor (AhR), which regulates cellular detoxification and immune homeostasis. An effect on the expression of the enzyme indoleamine-2,3-dioxygenase (IDO), involved in the immunometabolism of tryptophan and regulation of tolerance, has also been demonstrated.

At the cellular level, the ability of the active substances of willow bark to reduce the migration of neutrophils and macrophages in the focus of inflammation has been confirmed, as well as to suppress the expression of the enzyme matrix metalloproteinase-9 (MMP-9), involved in the remodeling of the extracellular matrix and chronicity of inflammation.

Thus, the pharmacological mechanisms of action of white willow include suppression of enzymatic pathways of inflammation (COX, LOX), blockade of mediator transmission (prostaglandins, cytokines), antioxidant stabilization of cellular structures, as well as immunotropic regulation through NF-κB and AhR signaling cascades. These effects are realized mainly at the level of macrophages, neutrophils, endothelial cells, and receptor targets of the inflammatory profile.

References:
https://www.ncbi.nlm.nih.gov/p...
https://pubmed.ncbi.nlm.nih.go...
https://www.sciencedirect.com/...
https://pubchem.ncbi.nlm.nih.g...

Synergy — Salix alba

Pharmacological synergy of white willow with other plant and natural compounds has been confirmed by numerous preclinical and laboratory studies. One of the most studied areas is the potentiation of anti-inflammatory action when used together with polyphenolic compounds of the flavonoid series. Combined use of white willow and curcumin has shown an increase in the suppression of COX-2 expression and prostaglandins, as well as a more pronounced inhibition of NF-κB signaling in macrophages, which confirms the additive and potentiating nature of the interaction.

Synergy with boswellia extracts (Boswellia serrata) has also been identified, in which a more sustained reduction in the production of leukotrienes and thromboxane B2 is achieved due to double inhibition of LOX and COX cascades. This combination has demonstrated tissue-specific enhancement of the effect in connective tissue structures and in the vascular endothelium.

Combination with bioflavonoids of grape seeds or green tea (epigallocatechin gallate) enhances the antioxidant and membrane-stabilizing effect, which is manifested through stabilization of lysosomal membranes and a decrease in ROS production in endothelial cells. This interaction is realized at the cellular and mitochondrial levels, reflecting modulation of the oxidative cascade.

A separate area of synergy has been noted with the combined use of white willow and omega-3 polyunsaturated fatty acids. It has been proven that omega-3 enhances the antiplatelet properties of salicin-like metabolites through competition for eicosanoid metabolism enzymes, reducing the formation of thromboxane A2.

In experimental models, potentiation of sedative and anxiolytic action has been established when white willow is combined with extracts of lemon balm and passionflower. This effect is due to the action of flavonoids on gamma-aminobutyric acid (GABA) receptors and suppression of adenylate cyclase activity, which enhances inhibitory neuromodulation.

Thus, white willow can enter into potentiating, additive, and modulating interactions with a number of natural substances. Targets of synergy include inflammation enzymes (COX, LOX), mediators (prostaglandins, thromboxanes), receptors (GABA, AhR), signaling cascades (NF-κB, MAPK), as well as antioxidant systems (SOD, glutathione).

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

Geography of Use and Traditional Medicine — Salix alba

Salix alba has a long history of use in the folk medicine of Europe, Asia, and the Middle East. One of the first regions where the plant gained recognition as a medicinal remedy was the territory of Ancient Greece: references to the use of willow bark are contained in the works of Hippocrates (5th century BC), where properties similar to modern ideas about plants containing salicylates are described. In the medieval European tradition, willow bark was actively used in monastic medicine — especially in Benedictine scriptoria in France and Germany, where it was part of decoctions used to maintain strength and reduce fever. In the manuscripts of the Salerno school, recommendations for its external use in the form of wraps and compresses have also been preserved.

The Slavic peoples, especially in the territory of Ancient Rus', used willow branches and bark for the preparation of infusions, applications, and bath decoctions. In Russian village tradition, willow was considered a "women's tree," associated with purification and restoration; its branches were used in ritual baths on the days of the spring equinox. Ethnography records the use of willow bark decoction for fumigating premises in order to "remove the evil eye" and neutralize negative energy.

In Islamic traditional medicine, willow was known as "shajarat as-safsaf" and was used in the Maghreb and Persia as a remedy capable of "cooling the blood" and soothing "internal heat." Bark decoctions were part of multicomponent recipes in the school of Avicenna, in particular in combination with mint and pomegranate.

In Tibet and Mongolia, willow bark was used as part of powders and oils used for rubbing into the joints, and also as a component of medicinal fumigations. In the ritual practice of Bon and Lamaism, willow branches were considered a tree of purification, used in ritual purifications from "spirits of heat" and for tying altars during spring festivals.

In Chinese ethnomedicine, the species Salix alba is less common; however, in the northern provinces (Shandong, Hebei), it was part of the recipes of local healers, mainly as a component of anti-dampness infusions and water baths. In Nepal and northern India, trees of the genus Salix were used to create pastes based on ground bark, which were applied to the body after physical exhaustion.

In Thailand and Laos, according to QSBG, willow trees are considered a secondary source for folk medicine, but branches and bark may be used for rubs, especially in mountainous areas with a Chinese population. In the culture of the Carpathian Hutsuls and Moldovans, willow was used in spring-summer rituals: wreaths were woven from its branches, which were burned on Kupala to cleanse the home of diseases.

Thus, white willow acts as one of the oldest ethnomedical resources of Eurasia, the use of which covers a wide range of regions, cultures, and ritual practices. Its forms of application vary from decoctions and pastes to wraps, fumigations, and ritual fumigation. In a number of traditions, the plant was endowed not only with a therapeutic but also with a protective, talismanic function.