Epigallocatechin-3-Gallate (EGCG)
Also known as: EGCG, epigallocatechin gallate, green tea catechin, green tea extract
Effective Dosage
No established dose from provided studies alone; 720 mg/day used in one trial
What the Science Says
EGCG is the most abundant active compound in green tea, belonging to a class of antioxidants called catechins. In clinical trials, it has been studied for potential benefits in cognitive support (particularly in high-risk older adults), metabolic health, and reducing folate-related concerns in women of reproductive age. Most human evidence is preliminary — one 12-month trial in older adults at Alzheimer's risk found EGCG added to a lifestyle program did not significantly beat placebo on the primary cognitive measure, though exploratory results after a washout period were more encouraging.
What It Doesn't Do
Not proven to prevent Alzheimer's disease or reverse cognitive decline on its own. No solid human evidence it treats cancer — lab and animal studies don't translate directly to people. Won't reliably cause weight loss. Not a substitute for a healthy diet or lifestyle. The anti-aging and 'detox' claims you see on product labels are not backed by the studies provided here.
Evidence-Based Benefits
Epigallocatechin-3-gallate (EGCG) is a polyphenol found in green tea that has been shown to have antioxidant properties and may support cardiovascular health. It has also been studied for its potential role in weight management and metabolic health.
Strong EvidenceEffective at: 300-400 mg daily
Source: auto-research
Absorption & Bioavailability
Poor — EGCG is rapidly metabolized and has low oral bioavailability. Multiple reviewed papers flag this as a major limitation for clinical use. Nanoparticle and liposomal delivery systems are being explored to address this.
Red Flags to Watch For
- May interact with folate metabolism — though one 30-day trial found no folate deficiency at 720 mg/day, women of childbearing age should consult a doctor before supplementing
- High doses have raised liver toxicity concerns in broader literature; the provided studies do not fully characterize long-term safety
- Most exciting findings (cancer, neurodegeneration) come from lab or animal studies — human clinical evidence is very limited and often inconclusive
- Widely marketed for weight loss and anti-aging with little to no human trial support in the provided data
- Supplements vary widely in EGCG content and purity — 1,000+ registered products exist with no standardized dosing
Research Sources
- PubMed
- NIH DSLD
This information is for educational purposes only and is not medical advice. Always consult a healthcare professional before starting any supplement regimen. Last updated: 2026-04-06