# Lepidine **Canonical URL:** https://ingredients.hermeticasuperfoods.com/ingredients/lepidine **Data Source:** Hermetica Superfoods Ingredient Encyclopedia **Updated:** 2026-04-01 **Evidence Score:** 2 / 10 **Category:** Compound **Also Known As:** Garden cress alkaloid, Lepidium sativum alkaloid, Quinoline alkaloid from cress, Cress seed alkaloid, LS alkaloid ## Overview Lepidine is a quinoline alkaloid found in plants such as Lepidium species, notable for its ability to modulate muscarinic receptors and act as a calcium channel antagonist. Its primary investigated mechanisms involve improving glycemic control and exerting bronchodilatory effects in preclinical animal models. ## Health Benefits • May reduce fasting [blood glucose](/ingredients/condition/weight-management) and improve lipid profiles in diabetic rat models, enhancing pancreatic islet function (Preclinical study)[2]. • Shows potential bronchodilatory activity by inhibiting muscarinic receptors and acting as a Ca²⁺ antagonist in guinea-pig trachea (Animal study)[4]. • Exhibits antifungal properties by inhibiting enzymes in Candida albicans (In vitro study)[6]. • Inhibits enzymes linked to Alzheimer's and SARS-CoV-2, though evidence is limited to in silico and in vitro studies (In vitro study)[5][6]. • Potentiates the effects of metformin in diabetic rat models, indicating possible adjunctive benefits (Preclinical study)[2]. ## Mechanism of Action Lepidine exerts bronchodilatory effects by antagonizing muscarinic (M3) receptors in airway smooth muscle and functioning as a Ca²⁺ channel antagonist, reducing intracellular calcium-mediated bronchoconstriction in guinea-pig tracheal tissue. In diabetic animal models, lepidine appears to enhance pancreatic beta-cell function and insulin secretion, thereby improving fasting [blood glucose](/ingredients/condition/weight-management) and lipid profiles. These dual mechanisms suggest interactions with cholinergic signaling pathways and glucose homeostasis regulators, though the precise molecular targets in human physiology remain uncharacterized. ## Clinical Summary Current evidence for lepidine is entirely preclinical, derived from in vitro and animal studies, with no published human clinical trials as of 2024. Diabetic rat model studies have reported reductions in fasting [blood glucose](/ingredients/condition/weight-management) and improvements in lipid profiles, alongside enhanced pancreatic islet morphology and function. Guinea-pig tracheal preparations have demonstrated measurable bronchodilatory responses attributed to muscarinic receptor antagonism and calcium antagonism. The absence of human data means efficacy and appropriate dosing in humans cannot be established, and all findings should be interpreted with significant caution. ## Nutritional Profile Lepidine (4-methylquinoline, C₁₀H₉N, MW 143.19 g/mol) is a heterocyclic aromatic nitrogen compound, not a nutrient or food item. It is a synthetic/naturally occurring quinoline derivative and is classified as a bioactive chemical compound rather than a source of macro- or micronutrients. Key details: • It is a colorless to pale yellow liquid with a boiling point of ~262°C and density ~1.086 g/cm³. • It contains no vitamins, minerals, dietary fiber, or protein. • It has no caloric or nutritional value for human consumption. • As a bioactive compound, its pharmacologically relevant concentrations in research are typically in the micromolar (µM) range: antifungal MIC values reported against Candida albicans in the range of ~50–200 µg/mL (in vitro); bronchodilatory effects observed at concentrations of ~10⁻⁶–10⁻⁴ M in isolated tissue preparations; hypoglycemic effects in diabetic rat models studied at oral doses of ~20–50 mg/kg body weight. • Lepidine and its derivatives (e.g., lepidine N-oxide, chlorolepidine) serve primarily as scaffolds in medicinal chemistry for synthesizing pharmacologically active analogs. • Bioavailability: Limited human pharmacokinetic data exist. In animal models, quinoline derivatives including lepidine are generally absorbed orally and undergo hepatic [metabolism](/ingredients/condition/weight-management) via cytochrome P450 enzymes (particularly CYP1A2 and CYP3A4), yielding hydroxylated and N-oxidized metabolites. Lipophilicity (logP ~2.0–2.5) suggests moderate membrane permeability. • Naturally found in small trace amounts in coal tar and certain plant alkaloid fractions, but not at nutritionally meaningful concentrations. • Safety note: Quinoline derivatives can exhibit hepatotoxicity and mutagenic potential at elevated doses; lepidine is not approved for human dietary or therapeutic use. ## Dosage & Preparation No clinically studied dosages in humans exist. In preclinical rat studies, lepidine was dosed at 20 mg/kg body weight orally every other day for 4 weeks. Consult a healthcare provider before starting any new supplement. ## Safety & Drug Interactions No human safety data, established safe dosage ranges, or toxicology profiles exist for lepidine as an isolated supplement ingredient. Given its muscarinic receptor antagonist activity, theoretical interactions with anticholinergic drugs (e.g., atropine, tiotropium) and potential additive effects on heart rate or intraocular pressure are plausible concerns. Its reported [blood glucose](/ingredients/condition/weight-management)-lowering activity in animal models suggests a theoretical risk of additive hypoglycemia when combined with antidiabetic medications such as metformin or insulin. Lepidine should be avoided during pregnancy and lactation due to a complete absence of safety data in these populations. ## Scientific Research No human clinical trials or meta-analyses specifically on lepidine have been found. The evidence is largely limited to preclinical studies in animal models and in vitro experiments.[2][4][6] ## Historical & Cultural Context Lepidium sativum has traditional use in treating airway disorders such as cough and asthma, supported by its bronchodilatory mechanisms. Specific historical systems using lepidine are not documented. ## Synergistic Combinations Metformin, Atropine, Verapamil, Isoprenaline, Rolipram ## Frequently Asked Questions ### What is lepidine and what plants does it come from? Lepidine is a quinoline-class alkaloid identified in plants of the Lepidium genus, a group that includes garden cress and maca, as well as certain other alkaloid-bearing botanical species. It is one of several bioactive nitrogen-containing compounds extracted from these plants and studied for pharmacological properties. Research into lepidine remains at an early, preclinical stage with no commercially standardized supplement form widely available. ### Can lepidine lower blood sugar levels? Preclinical studies using diabetic rat models have shown that lepidine may reduce fasting blood glucose and improve lipid profiles, potentially by enhancing pancreatic islet cell function and promoting insulin secretion. These findings are promising but are limited entirely to animal research, meaning no human clinical trial data exists to confirm this effect in people. Individuals with diabetes should not use lepidine as a substitute for prescribed antidiabetic therapy. ### How does lepidine work as a bronchodilator? Lepidine has demonstrated bronchodilatory activity in guinea-pig tracheal preparations by acting as an antagonist at muscarinic (M3) receptors, which are responsible for cholinergic-mediated airway smooth muscle contraction. It also functions as a calcium channel antagonist, reducing Ca²⁺ influx into smooth muscle cells and thereby inhibiting bronchoconstriction. This dual mechanism mirrors the pharmacological approach of some existing bronchodilator drug classes, though no human respiratory trials have been conducted. ### Are there any known drug interactions with lepidine? Because lepidine inhibits muscarinic receptors, combining it with other anticholinergic medications such as ipratropium, tiotropium, or atropine could theoretically produce additive anticholinergic effects including dry mouth, urinary retention, and elevated heart rate. Its potential blood glucose-lowering properties also raise concerns about additive hypoglycemia when taken alongside insulin, metformin, or sulfonylureas. These interactions are theoretical based on mechanism, as no formal drug interaction studies in humans have been performed. ### Is lepidine safe to take as a supplement? Lepidine has no established human safety profile, no defined tolerable upper intake level, and no regulatory approval as a dietary supplement ingredient in major markets such as the US or EU. All available toxicology and pharmacology data come from animal studies, which cannot reliably predict human safety outcomes. Until well-designed human clinical trials are completed, lepidine cannot be considered safe for supplementation, and use during pregnancy, lactation, or alongside prescription medications is strongly discouraged. ### What does the research show about lepidine's effectiveness compared to conventional diabetes medications? Current evidence for lepidine comes primarily from preclinical rat models showing improvements in fasting blood glucose and pancreatic islet function, which is promising but not yet equivalent to human clinical data. Conventional diabetes medications like metformin and sulfonylureas have extensive clinical trial data demonstrating efficacy in humans, whereas lepidine lacks comparable phase III human studies. More human clinical trials are needed to determine whether lepidine could serve as a complementary or alternative approach to standard diabetes management. ### Who might benefit most from lepidine supplementation based on current research? Individuals with elevated fasting blood glucose or lipid imbalances may theoretically benefit from lepidine based on animal studies, though human evidence is limited. Those experiencing respiratory symptoms like asthma-related bronchoconstriction could be candidates, given lepidine's bronchodilatory mechanism observed in animal models. However, anyone considering lepidine supplementation should consult a healthcare provider, as current evidence is insufficient to make definitive recommendations for specific populations. ### What is the current evidence for lepidine's antifungal properties and potential applications? Lepidine demonstrates in vitro antifungal activity against Candida albicans by inhibiting key fungal enzymes, suggesting potential for fungal infection management. However, in vitro findings do not directly translate to human efficacy, and no clinical trials have yet confirmed whether lepidine can effectively treat fungal infections in living organisms. Additional animal studies and human clinical trials would be necessary before lepidine could be considered for practical antifungal applications. --- *Source: Hermetica Superfoods Ingredient Encyclopedia — https://ingredients.hermeticasuperfoods.com* *License: CC BY-NC-SA 4.0 — Attribution required. Commercial use: admin@hermeticasuperfoods.com*