Cinnamomum Loureirii (Saigon Cinnamon)

Cinnamomum Loureirii (Saigon Cinnamon)

Product Name: Корица лоурейра, Cinnamomum loureiroi, Saigon-Zimt, canela de Saigón, cannelle de Saïgon, قرفة سايغون, อบเชยญวน, Saigon dolch, Сайгон дорчи, Сайгон долч, Сайгон долч, Қори Саигон, Saigon cinamonas, Saigon kanēlis, Кориця Сайгонська, Сайгон darçını, קינמון סייגון

Synonyms: вьетнамская корица, саигонская корица, Saigon cinnamon, Vietnamese, Saigon-Zimt, canela vietnamita, cannelle vietnamienne, قرفة فيتنامية, อบเชยเวียดนาม,

Parts Used: bark, leaves, branches, flowers, seeds.

Main Indications for Use of Cinnamomum loureiroi: Arterial hypertension, hyperglycemia, chronic gastritis, flatulence, dyspepsia, alimentary obesity, hyperlipidemia, bacterial enteritis, oral candidiasis, chronic pharyngitis.

Use of Cinnamomum loureiroi in Mixtures and Complexes: Astheno-neurotic syndrome, neurocirculatory dystonia of the hypotonic type, irritable bowel syndrome, chronic pancreatitis, viral hepatitis, herpetic infections, rhinosinusitis.

Pharmacological Properties of Cinnamomum loureiroi: Antimicrobial, antioxidant, anti-inflammatory, spasmolytic, hypoglycemic, carminative, antiseptic, tonic, antimycotic, hypotensive, flavoring.

Dosage of Pharmaceutical Forms — Cinnamomum loureiroi

Powder — Cinnamomum loureiroi

Indications (Powder): Arterial hypertension, hyperglycemia, hyperlipidemia, alimentary obesity, chronic gastritis, oral candidiasis, dyspepsia, bacterial enteritis.

Standard Dosage (Powder): 1 g twice daily, washed down with warm water, 20 minutes before meals.

Enhanced Dosage (Powder): 2 g 3 times a day for hyperglycemia, arterial hypertension, and alimentary obesity. Course no more than 10 consecutive days, then a break of at least 5 days.

Maximum Dosage (Powder): 3 g 3 times a day. Permissible only under specialist supervision for decompensated hyperlipidemia or refractory hyperglycemia.

Preventive Dosage (Powder): 0.5 g once daily for 14 days in each month. Recommended for chronic metabolic syndrome, insulin resistance, and stage I hypertension.

Pediatric Dosage (Powder): 0.1–0.3 g once daily, starting from 6 years of age and weight from 20 kg. Not recommended for children under 6 years of age without a physician's prescription.

Contraindications (Powder): Gastric and duodenal ulcer, epilepsy, individual intolerance. Data on contraindications during pregnancy, lactation, and in childhood under 6 years of age have not been scientifically registered.

Side Effects (Powder): Nausea, heartburn, headache, allergic skin reactions in case of overdose.

Adjustment for Patient Body Weight (Powder): For patients with body weight less than 60 kg, a 20–25% dose reduction is recommended. For body weight over 90 kg, a dosage increase of up to 25% of the standard is permissible.

Preparation Method (Powder): Take 100 g of dried Cinnamomum loureiroi bark. Wash the bark with water and dry at a temperature of 45–50 °C to a residual moisture content of less than 10%. Grind into powder using a mill with a 0.3 mm mesh. Sift and package into an airtight dark glass container.

Storage Conditions and Shelf Life (Powder): Store in an airtight dark glass package at a temperature of 15–25 °C, in a dry and dark place. Avoid direct sunlight and exposure to electromagnetic radiation. Shelf life — up to 12 months. After opening, use within 60 days.

Dry Extract — Cinnamomum loureiroi

Indications (Dry Extract): Hyperglycemia, hyperlipidemia, arterial hypertension, metabolic syndrome, chronic pancreatitis, dyspepsia.

Standard Dosage (Dry Extract): 200 mg of dry extract twice daily, 30 minutes before meals.

Enhanced Dosage (Dry Extract): 400 mg 3 times a day for insulin resistance, metabolic syndrome, and stage II arterial hypertension.

Maximum Dosage (Dry Extract): 600 mg 3 times a day. Permissible no more than 5 consecutive days, for severe forms of hyperglycemia with clinical decompensation.

Preventive Dosage (Dry Extract): 100 mg once daily for 21 days. Recommended for patients with increased body weight, insulin resistance, and dyslipidemia.

Pediatric Dosage (Dry Extract): 50 mg once daily. Used in children from 8 years of age and body weight from 25 kg. Do not use without a pediatrician's recommendation.

Contraindications (Dry Extract): Hypersensitivity to plant components, ulcer, epilepsy. Data on contraindications during pregnancy, lactation, and in childhood under 8 years of age have not been scientifically registered.

Side Effects (Dry Extract): Increased sweating, tremor, irritability, headache; with prolonged use — digestive disorders.

Adjustment for Patient Body Weight (Dry Extract): For body weight less than 60 kg, the dosage is reduced by 20%. For body weight over 90 kg, it may be increased by 25%.

Preparation Method (Dry Extract): To obtain 100 g of extract, take 500 g of dry crushed Cinnamomum loureiroi bark. Extract with 60% ethanol (1:5) at a temperature of 40 °C for 6 hours. Strain and evaporate under vacuum at a temperature of 45 °C to a moisture content of no more than 5%. Dry in a drying chamber and grind to a powder-like state.

Storage Conditions and Shelf Life (Dry Extract): Store in an airtight pharmaceutical dark glass or polyethylene container, at a temperature of 15–25 °C, away from direct light and moisture. Shelf life — 18 months. After opening, use within 45 days.

Alcohol-Based Tincture — Cinnamomum loureiroi

Indications (Tincture): Arterial hypertension, hyperglycemia, flatulence, dyspepsia, chronic gastritis, oral candidiasis, bacterial enteritis, chronic pharyngitis.

Standard Dosage (Tincture): 20 drops twice daily, diluted in 50 ml of water, 20 minutes before meals.

Enhanced Dosage (Tincture): 30 drops 3 times a day for hyperglycemia, arterial hypertension, and severe dyspeptic disorders.

Maximum Dosage (Tincture): 40 drops 3 times a day. Permissible no more than 3 consecutive days for pronounced hyperglycemia or acute intestinal inflammation.

Preventive Dosage (Tincture): 15 drops once daily for 14 days. Recommended for prediabetic states, vegetative disorders, and chronic gastritis with reduced secretion.

Pediatric Dosage (Tincture): Not recommended for oral intake in children under 12 years of age. For children over 12 years — 5–10 drops diluted in water once daily under specialist supervision.

Contraindications (Tincture): Alcoholism, epilepsy, liver diseases, pregnancy. Data on contraindications during lactation and in adolescence under 12 years of age have not been scientifically registered.

Side Effects (Tincture): Tachycardia, tremor, irritability, nausea in case of overdose.

Adjustment for Patient Body Weight (Tincture): For body weight less than 60 kg — a 20% dosage reduction. For body weight over 90 kg — a 25% increase.

Preparation Method (Tincture): Take 100 g of dry crushed bark. Pour 500 ml of 70% ethanol. Infuse in an airtight glass container for 10 days in a dark place at room temperature. Shake daily. After infusion — filter through gauze and pour into a dark glass container with a dropper.

Storage Conditions and Shelf Life (Tincture): Store in a dark, cool place at a temperature of 8–20 °C, away from sources of heat and EMI. Shelf life — up to 24 months. After opening, use within 90 days.

Oil Infusion — Cinnamomum loureiroi

Indications (Oil Infusion): Chronic pharyngitis, rhinosinusitis, oral candidiasis, skin mycoses, seborrheic dermatitis, bacterial skin infections, neurodermatitis.

Standard Dosage (Oil Infusion): Externally — apply in a thin layer to the affected area twice daily.

Enhanced Dosage (Oil Infusion): Apply 3–4 times a day for pronounced skin inflammations, mycoses, or infections of the skin and mucous membranes.

Maximum Dosage (Oil Infusion): Up to 6 times a day on limited skin areas for persistent fungal lesions, no more than 7 consecutive days.

Preventive Dosage (Oil Infusion): Once daily on skin areas with chronic inflammatory processes or for care with a tendency to bacterial and fungal infections. Course — 10–14 days each month.

Pediatric Dosage (Oil Infusion): Topical application once daily is permissible for children from 6 years of age on limited skin areas. Only in the absence of irritation and under adult supervision.

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

Side Effects (Oil Infusion): Burning, redness, allergic reactions in case of hypersensitivity.

Adjustment for Patient Body Weight (Oil Infusion): Not required for external use; a dosage reduction is permissible for low body weight (up to 30 kg) due to increased skin sensitivity.

Preparation Method (Oil Infusion): Take 20 g of crushed dry Cinnamomum loureiroi bark. Pour 100 ml of unrefined coconut oil. Infuse in a water bath at a temperature of 45–50 °C for 4 hours. Stir every 30 minutes. After cooling — filter and pour into a dark glass container.

Storage Conditions and Shelf Life (Oil Infusion): Store at a temperature of 15–25 °C in an airtight dark glass container. Shelf life — up to 6 months. After opening, use within 30 days.

Vaginal Suppositories — Cinnamomum loureiroi

Indications (Vaginal Suppositories): Bacterial vaginosis, candidal vulvovaginitis, trichomoniasis, chronic cervicitis, atrophic vaginitis.

Standard Dosage (Vaginal Suppositories): 1 suppository once daily at night for 7–10 days.

Enhanced Dosage (Vaginal Suppositories): 1 suppository twice daily (morning and evening) for acute candidal vulvovaginitis, bacterial vaginosis, or trichomoniasis.

Maximum Dosage (Vaginal Suppositories): Up to 3 suppositories per day for recurrent vaginal infections, maximum 5 consecutive days, then transition to the standard dose.

Preventive Dosage (Vaginal Suppositories): 1 suppository once every 3 days for 2 weeks. Recommended for women with chronic inflammatory diseases of the pelvic organs, in premenopause, and with frequent use of antibiotics.

Pediatric Dosage (Vaginal Suppositories): Not used in children. Safety in girls under 18 years of age has not been scientifically confirmed.

Contraindications (Vaginal Suppositories): Pregnancy, individual intolerance, active bloody discharge. Data on contraindications during lactation have not been scientifically registered.

Side Effects (Vaginal Suppositories): Burning, itching, mucosal edema, rarely — contact dermatitis.

Adjustment for Patient Body Weight (Vaginal Suppositories): For body weight below 50 kg, the use of suppositories with a reduced dosage by 25–30% of the standard is recommended.

Preparation Method (Vaginal Suppositories): Take 1 g of dry Cinnamomum loureiroi extract, 1 g of cocoa butter, 5 g of coconut oil, 3 g of beeswax. Melt the oils and wax in a water bath at a temperature of 55 °C. Introduce the extract and stir thoroughly. Pour into suppository molds with a volume of 2 g. Cool at 4 °C. This yields about 100 g of finished suppositories.

Storage Conditions and Shelf Life (Vaginal Suppositories): Store in the refrigerator at a temperature of +2…+8 °C in airtight packaging. Shelf life — up to 6 months. After opening the blister, use within 7 days.

Rectal Suppositories — Cinnamomum loureiroi

Indications (Rectal Suppositories): Hemorrhoids, proctitis, anal fissures, chronic constipation, irritable bowel syndrome of the hypomotor type, intestinal atony.

Standard Dosage (Rectal Suppositories): 1 suppository once daily after defecation. Course — 7 days.

Enhanced Dosage (Rectal Suppositories): 1 suppository twice daily for pronounced pain syndrome, bleeding, and inflammation of the anal canal.

Maximum Dosage (Rectal Suppositories): 3 suppositories per day is permissible no more than 3 days for exacerbation of hemorrhoids and proctitis, then transition to the standard dose.

Preventive Dosage (Rectal Suppositories): 1 suppository once every 3 days for a month. Recommended for patients with chronic constipation, stage I hemorrhoids, and a sedentary lifestyle.

Pediatric Dosage (Rectal Suppositories): Permissible in children from 10 years of age and body weight from 30 kg — ½ suppository once daily. Only as prescribed by a pediatrician.

Contraindications (Rectal Suppositories): Acute paraproctitis, rectal bleeding of unidentified cause, intolerance to components. Data on contraindications during pregnancy and lactation have not been scientifically registered.

Side Effects (Rectal Suppositories): Burning, mucous discharge, false urges to defecate in case of exceeding the dose.

Adjustment for Patient Body Weight (Rectal Suppositories): For patients with body weight less than 50 kg, the use of reduced-volume suppositories (up to 1.5 g) is recommended. For body weight over 90 kg — the standard dosage is permissible up to 2 times a day.

Preparation Method (Rectal Suppositories): Mix 2 g of dry Cinnamomum loureiroi extract, 3 g of coconut oil, 3 g of beeswax, and 2 g of cocoa butter. Melt the fat components in a water bath at a temperature of 50 °C. Introduce the extract and stir until homogeneous. Pour into rectal molds of 2 g each and cool at 4 °C until completely solidified.

Storage Conditions and Shelf Life (Rectal Suppositories): Store at a temperature of +2…+8 °C in the original packaging. Shelf life — 6 months. After opening, use within 7 days.

Nasal Drops — Cinnamomum loureiroi

Indications (Nasal Drops): Rhinosinusitis, chronic rhinitis, vasomotor rhinitis, bacterial rhinitis, fungal rhinitis, nasal congestion in acute respiratory viral infections.

Standard Dosage (Nasal Drops): 1–2 drops into each nostril 3 times a day for 5–7 days.

Enhanced Dosage (Nasal Drops): 3 drops into each nostril 4 times a day for purulent rhinosinusitis and prolonged forms of bacterial rhinitis.

Maximum Dosage (Nasal Drops): Up to 5 drops into each nostril 5 times a day, only for severe nasal congestion. Duration no more than 3 days.

Preventive Dosage (Nasal Drops): 1 drop into each nostril once daily for 7 days. Recommended during seasons of high viral activity and for chronic sinusitis in the remission stage.

Pediatric Dosage (Nasal Drops): From 6 years: 1 drop into each nostril twice daily. Use in children under 6 years of age is not recommended due to the risk of mucosal irritation.

Contraindications (Nasal Drops): Individual intolerance, atrophic rhinitis, pronounced mucosal edema. Data on contraindications during pregnancy, lactation, and in children under 6 years of age have not been registered.

Side Effects (Nasal Drops): Burning, sneezing, increased mucus secretion, short-term increase in blood pressure in case of overdose.

Adjustment for Patient Body Weight (Nasal Drops): For body weight less than 40 kg, the use of the minimum dosage is recommended. For body weight over 90 kg — the standard dosage without changes.

Preparation Method (Nasal Drops): Take 1 g of dry cinnamon extract, dissolve in 10 ml of saline solution, and add 1 ml of coconut oil; emulsify at a temperature of 40 °C. Pour into a sterile dropper bottle. Total volume — 11 ml (for 100 ml — scale the proportions accordingly).

Storage Conditions and Shelf Life (Nasal Drops): Store at a temperature of +4…+8 °C. Shelf life — up to 30 days in an airtight bottle. After opening — use within 7 days.

Ear Drops — Cinnamomum loureiroi

Indications (Ear Drops): Otomycosis, external otitis, eczema of the auditory canal, bacterial inflammation of the external ear.

Standard Dosage (Ear Drops): 2 drops into each auditory canal twice daily for 5 days.

Enhanced Dosage (Ear Drops): 3 drops 3 times a day for pronounced inflammation, pain syndrome, and mycotic lesions.

Maximum Dosage (Ear Drops): Up to 5 drops 3 times a day, no more than 3 consecutive days, for acute inflammatory processes of the external ear.

Preventive Dosage (Ear Drops): 1 drop once daily after contact with water (e.g., after the pool). Recommended for patients with frequent episodes of external otitis.

Pediatric Dosage (Ear Drops): From 6 years: 1 drop into the auditory canal 1–2 times a day. Do not use in children under 6 years of age without consultation with an ENT physician.

Contraindications (Ear Drops): Damage to the eardrum, exudative otitis, individual hypersensitivity. Data on contraindications during pregnancy and lactation are absent.

Side Effects (Ear Drops): Burning, itching, feeling of fullness, irritation of the auditory canal.

Adjustment for Patient Body Weight (Ear Drops): Not required, as the form is applied locally.

Preparation Method (Ear Drops): Take 2 g of dry extract, dissolve in 10 ml of heated coconut oil (temperature 40 °C), and stir thoroughly until homogeneous. Filter through a sterile cotton pad. Pour into a 10 ml dropper bottle.

Storage Conditions and Shelf Life (Ear Drops): Store in a dark glass bottle at a temperature up to +8 °C. Shelf life — 30 days. After opening, use within 10 days.

Cosmetic Serum — Cinnamomum loureiroi

Indications (Cosmetic Serum): Papulopustular acne, comedonal acne, oily seborrhea, dull complexion, skin laxity, enlarged pores, post-acne, initial signs of skin aging.

Standard Dosage (Cosmetic Serum): Apply 2–3 drops to cleansed facial skin once daily, before bedtime. Course — 21 days.

Enhanced Dosage (Cosmetic Serum): Apply 2–3 drops twice daily (morning and evening) for inflammatory acne and oily seborrhea. Course — up to 14 days, then switch to the standard regimen.

Maximum Dosage (Cosmetic Serum): Up to 4 drops twice daily on limited skin areas for pronounced inflammations and post-acne. Duration — no more than 7 days.

Preventive Dosage (Cosmetic Serum): 1–2 drops once daily in the evening. Recommended for patients with oily and combination skin prone to pore congestion and dullness, as well as under stress. Use in courses of 10 days once a month.

Pediatric Dosage (Cosmetic Serum): Use is permissible from 12 years of age in the presence of dermatological indications (comedones, mild acne). Only as prescribed by a dermatologist.

Contraindications (Cosmetic Serum): Atopic dermatitis in the exacerbation stage, rosacea, allergy to the components of the preparation. Data on contraindications during pregnancy and lactation have not been registered.

Side Effects (Cosmetic Serum): Redness, burning, peeling, allergic rash, temporary increase in eruptions in case of individual intolerance.

Adjustment for Patient Body Weight (Cosmetic Serum): Not required; adjustment is made by skin type, not body weight.

Preparation Method (Cosmetic Serum): Take 2 g of dry cinnamon extract, 10 ml of lavender hydrolate, 2 ml of vegetable glycerin, 5 ml of unrefined jojoba oil, 5 ml of unrefined coconut oil, 0.5 ml of Centella asiatica extract. Combine the ingredients in a sterile dish and stir in a water bath at 35 °C for 15 minutes. Cool, pour in 0.5 ml of rosemary oil as a preservative, and pour into 10 ml pipette bottles.

Storage Conditions and Shelf Life (Cosmetic Serum): Store at a temperature of +5…+10 °C in a dark place. Avoid direct light and heating. Shelf life — 45 days. After opening, use within 20 days.

Toxicity and Biosafety of Cinnamomum loureiroi

Studies of the toxicity of Cinnamomum loureiroi have shown that the main component of the bark — cinnamic aldehyde — has a dose-dependent effect. According to preclinical trials on rodents, oral administration of Cinnamomum loureiroi bark extract at high doses demonstrated relatively low acute toxicity.

The LD50 value for the aqueous extract of Cinnamomum loureiroi in mice is more than 2000 mg/kg body weight, which classifies it as a substance with low acute toxicity. In most trials, no lethal outcomes were observed at doses up to 5000 mg/kg. However, with prolonged use or exceeding recommended doses, side reactions associated with the action of cinnamic aldehyde are possible: hepatotoxicity, sensitization, contact dermatitis.

The safety of the extract has also been confirmed in limited clinical studies, where no side effects were observed when used at doses up to 0.5 g/day for 3–4 weeks. Nevertheless, caution should be exercised when using alcohol tinctures and concentrated extracts.

Reference: studies of LD₅₀ and toxicological profile (PMC)

Pharmacodynamics — Cinnamomum loureiroi

The pharmacodynamic properties of Cinnamomum loureiroi are due to the presence in its composition of volatile compounds (primarily phenylpropanoids), flavonoids, tannins, and terpenoids possessing complex biological action on the physiological systems of the human body. The most important role in the action of the preparation is played by cinnamic aldehyde, eugenol, and cinnamyl alcohol, which together participate in the regulation of inflammatory, oxidative, and neurovegetative processes.

At the level of target systems, it has been established that the active components of Cinnamomum loureiroi exert a systemic influence on the digestive, immune, cardiovascular, and nervous systems. The main pharmacodynamic effect is anti-inflammatory action, which is realized through suppression of the synthesis of pro-inflammatory cytokines and inhibition of the enzymes cyclooxygenase (COX) and lipoxygenase (LOX). These mechanisms contribute to a decrease in the expression of inflammatory mediators in tissues and blockade of arachidonic acid cascades.

At the level of antioxidant activity, the preparation demonstrates the ability to inhibit free-radical reactions due to the presence of phenolic compounds and tannins. These substances neutralize reactive oxygen species, which leads to stabilization of cell membranes and a decrease in oxidative stress. Indirectly through this mechanism, a trophic and membrane-stabilizing effect on epithelial and endothelial cells is provided.

With respect to the nervous system, mild modulating properties of Cinnamomum loureiroi extracts have been confirmed, manifested in a mild sedative and adaptogenic effect. This effect is associated with the influence of essential components on γ-aminobutyric acid (GABA) receptors, as well as with the regulation of vegetative activity. Oil forms and essential components through olfactory pathways exert a central modulating effect, changing neurovegetative tone.

At the immunological level, nonspecific immunomodulatory properties have been noted, consisting in stimulation of the phagocytic activity of macrophages and increased production of immunoglobulins. These effects are realized with systemic use of alcohol and aqueous extracts in small dosages.

For skin receptors, with local application, cinnamon extracts have a keratoplastic and antiseptic effect. This is confirmed by experimental data on the effect on microbial flora and normalization of the skin barrier state.

The total effect of Cinnamomum loureiroi can be described as a combination of antiseptic, antioxidant, anti-inflammatory, and modulating action with local activity in the area of mucous membranes and skin and systemic effect with oral administration. These properties have been confirmed both in in vitro studies and in experimental in vivo works.

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

Pharmacokinetics — Cinnamomum loureiroi

The absorption of the active substances of Cinnamomum loureiroi depends on the form of administration. With oral administration of powder or dry extract, the absorption of phenolic compounds, including cinnamic aldehyde and eugenol, occurs predominantly in the small intestine. These components have moderate lipophilicity, which facilitates their passage through enterocyte membranes. Biologically active terpenoids, as a rule, are slowly metabolized and can participate in interaction with intestinal microbiota, undergoing bacterial transformation.

Oil infusions and alcohol tinctures with oral administration demonstrate rapid resorption of active molecules into the systemic bloodstream, with partial presystemic metabolism in the liver. Substances from the essential fraction are characterized by high permeability through mucous membranes, especially with intranasal and transbuccal routes of administration. This determines the rapid realization of the pharmacodynamic effect and the minimal metabolic barrier with inhalation or application to mucous membranes.

With transdermal application (e.g., as part of an oil infusion or serum), the penetration of active substances is limited by the epidermal barrier; however, it is accompanied by accumulation in the lipophilic environment of the skin. Components such as eugenol and cinnamyl alcohol tend to deposit in the sebaceous glands, from which they are released gradually. This provides a prolonged local effect with minimal systemic absorption.

The metabolism of the active substances of Cinnamomum loureiroi occurs predominantly in the liver, with the participation of cytochrome P450 enzymes. The main pathways of biotransformation are oxidation, conjugation with glucuronic acid, and sulfation. The resulting metabolites, as a rule, have lower biological activity but retain weak antiseptic properties.

Excretion occurs through the kidneys in the form of water-soluble metabolites and partially with bile. For highly active volatile fractions, an excretion route through the lungs is possible, especially after inhalation or local application to extensive areas of the body. With chronic use, cumulation of individual components in adipose tissue is observed, especially with the systemic form of intake.

References:
https://pubchem.ncbi.nlm.nih.g...
https://www.sciencedirect.com/...
https://www.ncbi.nlm.nih.gov/p...
https://link.springer.com/arti...

Mechanisms of Action and Scientific Rationale — Cinnamomum loureiroi

The active compounds of Cinnamomum loureiroi, especially phenylpropanoids (cinnamic aldehyde), terpenoids, and polyphenols, exert a multifaceted biological effect through diverse molecular-cellular mechanisms. One of the key ones is the inhibition of inflammatory signaling cascades. Data from in vitro and in vivo studies indicate suppression of NF-κB and MAPK activation, decreased expression of COX-2 and LOX enzymes, as well as reduced production of pro-inflammatory prostaglandins and cytokines, including TNF-α, IL-6, and IL-1β. This provides limitation of the inflammatory response at the cellular level and stabilization of macrophage and endothelial membranes sciencedirect.com+4Frontiers+4journals.usamvcluj.ro+4.

A strong antioxidant effect is also known, realized through polyphenols and tannins. They successfully neutralize reactive oxygen species, inhibit free-radical chain reactions, and improve the antioxidant defense system of the cell. This is reflected in a decrease in oxidative stress, reduced damage to membrane lipids and proteins, as well as enhanced activity of protective enzymes.

Phenylpropanoids of C. loureiroi demonstrate a modulating influence on metabolic processes, including stimulation of the insulin signaling pathway through enhanced phosphorylation of IRS-1 and the β-insulin receptor, which leads to improved peripheral glucose uptake. This action is supported by a systemic decrease in the level of glycemia and enhanced tissue sensitivity to insulin journals.sagepub.com+2sciencedirect.com+2pubs.acs.org+2.

In the nervous system, a mild sedative and anxiolytic effect is noted. Studies show modulation of GABA receptors, which contributes to a decrease in neurovegetative excitability and facilitation of adaptive reactions to stress factors.

The antimicrobial properties of cinnamon are due to the combined action of cinnamic aldehyde, eugenol, and other oil components. They exhibit bacteriostatic and bactericidal action through disruption of the structure of bacterial membranes, suppression of biofilm formation, and influence on the synthesis of microbial proteins. The mechanism includes a change in the ion flux in the cell and destruction of the lipid barrier of bacteria and fungi pmc.ncbi.nlm.nih.gov+2mdpi.com+2pmc.ncbi.nlm.nih.gov+2.

In addition, synergy has been established between cinnamon extract and biologically active compounds (e.g., cinnamic aldehyde), which enhances the anti-inflammatory effect through suppression of JAK/STAT signaling, modulation of the expression of adhesion molecules, and inhibition of matrix metalloproteinases.

Thus, the mechanisms of action of C. loureiroi are multisystemic and multi-mechanistic: the combination of anti-inflammatory, antioxidant, neuromodulatory, and antimicrobial effects is realized through interaction with various receptors (GABA, insulin), enzyme systems (COX, LOX), signaling cascades (NF-κB, MAPK, JAK/STAT), as well as at the cellular level of macrophages, endothelium, and neurons.

Synergy — Cinnamomum loureiroi

Studies demonstrate synergistic effects of C. loureiroi in combination with other plant extracts and medicinal substances. For example, in vitro, an additive and potentiating interaction of aqueous cinnamon extract with the biotherapeutic agent infliximab has been shown, leading to a more pronounced suppression of pro-inflammatory mediators such as MMP-1, ICAM-1, and Bcl-xL compared to each component separately researchgate.net. This indicates functional complementation through modulation of JAK/STAT and MAPK cascades, which enhances the anti-inflammatory potential of the preparation.

Potentiation of antimicrobial action has also been described when using cinnamon essential oil in combination with antibiotics (e.g., amikacin), which leads to synergy in suppressing gram-positive and gram-negative pathogens. Cooperative blocking of the membrane functions of microorganisms and enhancement of the bactericidal effect allows reducing the threshold of the minimum inhibitory concentration of the antibiotic.

Laboratory in vitro studies have shown that the combination of cinnamon polyphenols with other anti-inflammatory flavonoids (e.g., from turmeric extract) leads to an additive effect on reducing the expression of NF-κB and COX-2, which contributes to better neutralization of the inflammatory-oxidative response at the cellular level researchgate.net+4mdpi.com+4researchgate.net+4.

Thus, the synergistic interactions of C. loureiroi have a cell- and system-specific action: additive suppression of mediator inflammation, enhancement of immunomodulatory effects, and increased effectiveness of antimicrobial therapy. These mechanisms receive support both in experimental studies and in pharmacological reviews, which makes this taxon promising as a basic or auxiliary strategy in complex biomedical approaches.

Geography of Use and Traditional Medicine — Cinnamomum loureiroi

Loureiro's cinnamon is traditionally used in the territory of Southeast Asia, predominantly in Vietnam, Laos, Cambodia, the northern provinces of Thailand, and the southern regions of China. Vietnamese folk medicine attaches special importance to this plant, considering it a source of warmth and vital energy. Within the framework of traditional Vietnamese therapy, based on a synthesis of local ethnobotanical knowledge and Chinese medical philosophy, the bark of Cinnamomum loureiroi is used in the form of dry tinctures, decoctions, and as part of complex remedies for internal and external use. In the ritual practice of the Viet people, cinnamon bark was also burned in the form of incense, believing that the smoke purifies the dwelling and promotes the expulsion of "cold" energy.

In the mountainous regions of Laos and northern Thailand, the bark and young shoots of Cinnamomum loureiroi were used as part of steam inhalations in the tradition of therapeutic wrapping with the use of warming herbs. Local Mon healers used cinnamon as a component of decoctions for washing, aimed at restoring the body's balance after childbirth. The use of oil or ground bark for rubbing is also recorded in the healing practices of the Khmu tribe living in northern Laos, where it was considered a plant "fire" stimulating blood flow.

In ancient Chinese sources, cinnamon, identified as a variety of Cinnamomum cassia and Cinnamomum loureiroi, was mentioned in the works of the Tang era (7th–10th centuries), where it was classified as a "hot plant" of yang nature, capable of activating the internal energy of qi.

According to ethnographic observations in Cambodia, bark extract and aqueous infusions of Cinnamomum loureiroi were used by elderly women as part of daily health care in the form of a warm drink stimulating "inner warmth."

In the informal spiritual practices of the peoples of northern Vietnam, cinnamon was considered a plant that strengthens the spirit and was added to incense mixtures for temple ceremonies. In purification rituals, especially those associated with the new moon and the end of the rainy season, its wood was burned as a protective incense.

Information on the medical use of Cinnamomum loureiroi outside Asia is scarce; however, in the Indochinese diaspora, the plant retains significance as a home remedy and an ingredient of traditional cuisine possessing healing status.