Oregano Leaves (Origanum vulgare)

Oregano leaves (Origanum vulgare) contain carvacrol and rosmarinic acid as primary bioactive compounds that exhibit antioxidant and antimicrobial properties. These compounds work by scavenging free radicals and disrupting bacterial cell membranes.

Origin & History

Oregano leaves derive from Origanum vulgare, a perennial herb native to the Mediterranean region belonging to the Lamiaceae family. The dried leaves are harvested from the plant, with essential oils extracted via steam distillation and polyphenolic extracts obtained through solvent or hot water methods.

Historical & Cultural Context

The research dossier does not specify historical or traditional medicine contexts for O. vulgare leaves. Modern analyses highlight its value as a nutrient-dense food source of polyphenols, but no traditional systems or historical uses are described in the available data.

Health Benefits

• Antioxidant activity demonstrated in vitro with CUPRAC values of 1284 µM TE/g and FRAP values of 794 µM TE/g (preliminary evidence only) • Lipid oxidation inhibition shown in laboratory studies, with extracts extending lag phase to 812 minutes at 2.5 µg (no human trials) • Potential antimicrobial effects from essential oil compounds like carvacrol (up to 74.3%) and thymol (up to 58.57%) (preclinical data only) • Anti-inflammatory properties suggested by triterpene acids including rosmarinic acid (12 mg/g in extracts) (mechanistic studies only) • Rich polyphenolic content (94.69 mg GAE/g) indicating possible systemic antioxidant effects (no clinical validation)

How It Works

Carvacrol disrupts bacterial cell membrane integrity by altering membrane fluidity and permeability. Rosmarinic acid and other phenolic compounds neutralize reactive oxygen species through electron donation mechanisms. The antioxidant activity involves metal chelation and inhibition of lipid peroxidation cascades.

Scientific Research

The research dossier explicitly states that search results lack human clinical trials, RCTs, or meta-analyses for oregano leaves (O. vulgare). Available evidence is limited to in vitro antioxidant assays and preclinical antimicrobial studies, with no PubMed PMIDs for human studies provided.

Clinical Summary

Current evidence is limited to in vitro studies demonstrating antioxidant capacity with CUPRAC values of 1284 µM TE/g and FRAP values of 794 µM TE/g. Laboratory studies show lipid oxidation inhibition extending lag phase to 812 minutes at 2.5 µg extract concentration. No human clinical trials have been conducted to validate therapeutic effects. Evidence remains preliminary and requires human studies for clinical validation.

Nutritional Profile

{"macronutrients": {"protein": "11.0 g per 100 g", "fiber": "42.5 g per 100 g", "fat": "4.3 g per 100 g", "carbohydrates": "68.9 g per 100 g"}, "micronutrients": {"vitamins": {"vitamin K": "621.7 \u00b5g per 100 g", "vitamin E": "18.26 mg per 100 g", "vitamin C": "2.3 mg per 100 g"}, "minerals": {"calcium": "1576 mg per 100 g", "iron": "44 mg per 100 g", "magnesium": "270 mg per 100 g", "potassium": "1260 mg per 100 g", "zinc": "4.4 mg per 100 g"}}, "bioactive_compounds": {"carvacrol": "up to 74.3% in essential oil", "thymol": "up to 58.57% in essential oil", "rosmarinic acid": "up to 20 mg per g"}, "bioavailability_notes": "The bioavailability of oregano's compounds can vary. Fat-soluble vitamins like vitamin E and K may be better absorbed with dietary fats. The bioavailability of minerals such as iron can be influenced by the presence of other dietary components like vitamin C, which can enhance absorption."}

Preparation & Dosage

No clinically studied dosage ranges are available as human trials are absent. Preclinical studies used extracts at 0.25–2.5 µg/mL for in vitro assays, with standardization targeting carvacrol (up to 74.3%), thymol (0.2–21.3%), or rosmarinic acid (0.12–6.8%). Consult a healthcare provider before starting any new supplement.

Synergy & Pairings

Rosemary, Thyme, Green Tea Extract, Vitamin C, Turmeric

Safety & Interactions

Oregano leaves are generally safe when consumed as food seasoning but may cause allergic reactions in sensitive individuals. High doses may interact with anticoagulant medications due to potential blood-thinning effects. Concentrated extracts should be avoided during pregnancy and breastfeeding due to insufficient safety data. May enhance effects of diabetes medications requiring blood sugar monitoring.