Educational dose math only — not medical advice, not a product recommendation, and not a pass/fail on whether a supplement will work for you.
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15 weight-loss trials. Small, statistically non-significant pooled effect; authors concluded not clinically important. Outside Japan MD −0.04 kg (95% CI −0.5 to 0.4).

Educational only — not medical advice. Disclaimer.

Want the outcome before the arithmetic? The reason check opens any registry entry on this page with its trial result first, then compares your daily intake with the studied amount.

NIH DSLD market slice

Median100 mg
Products5,240
Below96%

Bulk CSV dump 16 January 2026 · label entries through 2025. Disclosed amounts only — proprietary blends without gram weights excluded.

Trial floors

Primary

Cochrane weight-loss review · 800 mg over 12-13 weeks (medium evidence · how we grade this) · Primary endpoint missed — 15 weight-loss trials. Small, statistically non-significant pooled effect; authors concluded not clinically important. Outside Japan MD −0.04 kg (95% CI −0.5 to 0.4).

Secondary

Dose-response meta (Lin 2020) · 800 mg over 8-12 weeks (medium evidence · how we grade this) · Secondary outcomes only — Pooled −1.78 kg (95% CI −2.80 to −0.75). Waist reduction greater at ≥800 mg/day green tea preparations and duration <12 weeks. Heterogeneous extract types; part of effect is caffeine.

Terms: EGCG — the main catechin antioxidant in green tea extract.

Safety red flags

  • Do not mix stimulant-based fat burners with beta-blockers without your doctor.
  • Keep an eye on pulse and blood pressure if you use caffeine-heavy supplements.

Label reading notes

  • Lin meta used green tea preparation mg/day; EGCG-specific labels may not match extract totals in trials.
  • Cochrane verdict: not clinically important; shelf math is not a weight-loss promise.
  • Decaffeinated extracts show weaker or absent effects; thermogenic products often add 300–600 mg caffeine.
  • FDA warnings on green tea extract and idiosyncratic hepatotoxicity at high doses or with fasting.