Perilla (Perilla frutescens)
Perilla (Perilla frutescens) is a flowering herb used in Traditional Chinese Medicine whose primary bioactive compounds—rosmarinic acid and luteolin—inhibit inflammatory mediators including COX-2, LOX-5, and histamine release. These mechanisms underlie its clinically studied effects on joint pain, digestive discomfort, and allergic responses.
Origin & History
Perilla frutescens, also known as perilla or shiso, is an annual herb from the Lamiaceae family native to East Asia, including China, Japan, Korea, and India. It is cultivated for both culinary and medicinal uses, with extracts prepared from its leaves, stems, and seeds.
Historical & Cultural Context
Perilla frutescens has been used for over 2000 years in Traditional Chinese Medicine, Japanese Kampo, and Korean medicine for treating allergies, inflammation, asthma, and gastrointestinal issues. It is recognized in China as a 'medicine and food homologous' plant.
Health Benefits
• Reduces knee osteoarthritis pain significantly compared to placebo (RCT, PMID: 36998613). • Alleviates gastrointestinal discomfort, including bloating and gas (Pilot study, NCT01931930). • Decreases symptoms of allergic rhinoconjunctivitis, especially in youth (Systematic review, PMID: 36978975). • Exhibits potential hypolipidemic action and improved antioxidant status (Systematic review, PMC10045045). • May aid in cognitive function enhancement (Systematic review, PMC10045045).
How It Works
Rosmarinic acid, the dominant polyphenol in Perilla frutescens, suppresses NF-κB activation and downregulates COX-2 and 5-LOX enzymes, reducing prostaglandin E2 and leukotriene B4 synthesis that drive inflammation in joint tissue and nasal mucosa. Luteolin inhibits IgE-mediated mast cell degranulation by blocking phospholipase C and downstream calcium influx, which reduces histamine and IL-4 release relevant to allergic rhinoconjunctivitis. Perillaldehyde, a monoterpene constituent, modulates gastrointestinal smooth muscle tone via TRPA1 channels and may contribute to relief of bloating and intestinal spasm.
Scientific Research
Clinical trials have shown perilla extract to be effective in reducing knee osteoarthritis pain and improving gastrointestinal symptoms. A systematic review highlighted its potential benefits for allergies and cognitive function (PMID: 36998613, NCT01931930, PMID: 36978975).
Clinical Summary
A randomized controlled trial (PMID: 36998613) found that Perilla frutescens extract supplementation significantly reduced knee osteoarthritis pain scores compared to placebo, though exact sample size and dosage details from the published record should be confirmed. A pilot clinical study (NCT01931930) demonstrated alleviation of gastrointestinal symptoms including bloating and gas in adult participants, though the small-scale design limits generalizability. A systematic review (PMID: 36978975) concluded that Perilla-based interventions decreased allergic rhinoconjunctivitis symptom scores, particularly in pediatric and adolescent populations, across multiple included trials. Overall, evidence is promising but constrained by small sample sizes and heterogeneous study designs; larger Phase III RCTs are needed to confirm efficacy and optimal dosing.
Nutritional Profile
Perilla (Perilla frutescens) leaves contain approximately 30-40% protein by dry weight, making them notably protein-rich among herbs. Fat content is 3-5% fresh weight basis, with seed oil containing exceptionally high alpha-linolenic acid (ALA, omega-3) at 54-64% of total fatty acids, followed by linoleic acid (omega-6) at 14-20%. Fresh leaves provide approximately 3-4g dietary fiber per 100g. Key micronutrients per 100g fresh weight include: Vitamin C (26-70mg), Vitamin A as beta-carotene (approximately 880mcg RAE), Vitamin K1 (notably high at ~690mcg), Calcium (230mg), Iron (7.2mg), Magnesium (70mg), Potassium (500mg), and Manganese (1.2mg). Primary bioactive compounds include rosmarinic acid (1-4% dry weight in leaves, the dominant polyphenol), luteolin (0.1-0.7% dry weight), apigenin, chrysoeriol, and flavonoid glycosides including scutellarein. Perillaldehyde (responsible for aroma) constitutes 30-60% of essential oil. Anthocyanins, particularly shisonin and malonylshisonin, are present in red/purple varieties at 2-5mg/g dry weight. Bioavailability notes: Rosmarinic acid demonstrates relatively high oral bioavailability (~30-45%) compared to many polyphenols; ALA from seeds has conversion efficiency to EPA of approximately 5-10% in humans; Vitamin K1 bioavailability is enhanced when consumed with dietary fat.
Preparation & Dosage
Clinically studied doses include 1400 mg/day of Perilla frutescens leaf extract for osteoarthritis and unspecified doses for gastrointestinal discomfort. Consult a healthcare provider before starting any new supplement.
Synergy & Pairings
Turmeric, ginger, boswellia, bromelain, omega-3
Safety & Interactions
Perilla frutescens is generally well tolerated at studied doses, with mild gastrointestinal upset being the most commonly reported adverse effect in clinical trials. Because rosmarinic acid exhibits antiplatelet and mild anticoagulant properties via thromboxane A2 inhibition, concurrent use with warfarin, aspirin, or other anticoagulants may increase bleeding risk and warrants medical supervision. Perilla seed oil is high in alpha-linolenic acid and may have additive hypotensive effects when combined with antihypertensive medications. Safety data in pregnancy and lactation are insufficient; use should be avoided or only undertaken under physician guidance during these periods.