Named Bioactive Compounds · Compound
Catechin
Strong Evidenceflavanol
Hermetica Superfood Encyclopedia
Catechins are flavanol polyphenols found in tea, particularly green tea, that act as antioxidants and metabolic modulators. These compounds work by inhibiting lipid oxidation, modulating glucose metabolism enzymes, and influencing inflammatory pathways.
Catechin is a flavan-3-ol polyphenolic antioxidant naturally occurring in plants, first isolated from catechu (tannic juice of Mimosa catechu) in the early 1900s. Primary sources include tea leaves (Camellia sinensis), grapes, cacao, and apples, with commercial forms typically extracted via hot water infusion or solvent extraction from green tea leaves and standardized to catechin content.
A 2011 meta-analysis of 14 RCTs (n=1,138) demonstrated that green tea catechins (250-1,200 mg/day EGCG equivalents) significantly reduced LDL cholesterol and body weight versus placebo (PMID: 21523421). A 2018 RCT (n=115) using 856 mg catechins daily for 12 weeks improved insulin sensitivity and reduced waist circumference by 2.7 cm (PMID: 29438471). While observational data suggests cancer prevention benefits, no large RCTs support broad anticancer claims in humans (PMID: 32048368).
Clinically studied doses range from 200-1,200 mg/day of total catechins, typically as green tea extract standardized to 50-90% catechins or 40-60% EGCG. For weight loss and metabolic effects: 250-500 mg EGCG/day; for cardiovascular benefits: 300-800 mg total catechins/day. Divide doses with meals to enhance absorption. Consult a healthcare provider before starting any new supplement.
Catechin is a flavonoid polyphenol (flavan-3-ol) with molecular formula C15H14O6 and molecular weight 290.27 g/mol. It is not a macronutrient or micronutrient source but a bioactive phytochemical compound. Key structural variants include (+)-catechin (most abundant natural form), (-)-epicatechin, (+)-gallocatechin, and (-)-epigallocatechin (EGC). Concentrations vary by source: green tea contains 100–300 mg catechins per 200 mL serving (predominantly EGCG at 50–80% of total catechins); dark chocolate provides 40–120 mg per 40 g serving; red wine contributes 20–60 mg per 150 mL; apples supply 8–30 mg per 100 g (skin-concentrated). Pure catechin contains no protein, fat, fiber, or caloric macronutrients. Bioavailability is characteristically low and variable: oral bioavailability is estimated at 1–12% due to extensive first-pass metabolism, intestinal efflux transport (P-glycoprotein), and gut microbiome-mediated catabolism into ring-fission metabolites (phenylvalerolactones, phenylpropionic acids). Peak plasma concentration (Cmax) of ~0.1–0.5 µmol/L is achieved approximately 1–2 hours post-ingestion for (+)-catechin. Bioavailability is enhanced by co-consumption with piperine (+20%), vitamin C (reduces oxidative degradation), and lipid-containing meals. It is moderately stable at acidic gastric pH but degrades rapidly above pH 7. Protein binding in plasma is approximately 80–90%, primarily to albumin. Half-life is approximately 2–4 hours. No vitamins or minerals are intrinsic to the isolated compound.
Catechins, primarily epigallocatechin gallate (EGCG), inhibit pancreatic lipase and alpha-amylase enzymes, reducing fat absorption and glucose uptake. They activate AMP-activated protein kinase (AMPK) pathways, enhancing fatty acid oxidation and glucose metabolism. These compounds also scavenge reactive oxygen species and modulate NF-κB inflammatory signaling cascades.
A meta-analysis of 14 randomized controlled trials with 1,138 participants found catechins reduced LDL cholesterol by 4.5 mg/dL and body weight by 1.38 kg. One RCT with 115 participants demonstrated improved insulin sensitivity and 2.7 cm waist circumference reduction. Observational studies spanning over 1 million participants suggest an 18% lower prostate cancer risk, though causation requires further investigation. Most studies used green tea extracts providing 200-800 mg catechins daily.
Catechins are generally well-tolerated at typical dietary and supplemental doses up to 800 mg daily. High-dose EGCG supplements (above 800 mg) may cause liver enzyme elevation in sensitive individuals. Catechins can reduce iron absorption when consumed with meals and may enhance caffeine effects when taken from tea sources. Pregnant and breastfeeding women should limit high-dose catechin supplements due to insufficient safety data.
