Green Tea vs Green Coffee Extract for Weight | Dose Track
App Library Tools Pricing Download
[Supplements · Comparison]

Green tea extract vs green coffee bean extract: does either help weight loss?

Weight evidence · Trial quality · Liver safety

Short answer: Neither has strong evidence. NIH says green tea preparations gave about 0.95 kg more loss than placebo, with no significant difference in trials outside Japan.1 Green coffee extract showed 2.47 kg in 3 trials, all of poor quality, and another trial was retracted.21 Green tea extract pills are linked to rare liver injury.3

How do green tea extract and green coffee bean extract compare side by side?

From the NIH ODS weight-loss fact sheet, NCCIH and a meta-analysis.
Green tea extractGreen coffee bean extract
Main compoundsCatechins (mainly EGCG) and caffeine1Chlorogenic acid; also caffeine unless decaffeinated1
Weight result0.95 kg more than placebo (14 trials); not significant outside Japan12.47 kg more than placebo (3 trials, all high risk of bias)2
Trial quality (NIH)Several trials of good quality1Few trials, all of poor quality; one retracted after FTC criticism1
LiverAt least 50 case reports since 2006; mostly extract pills13Not flagged in the sources checked
Other side effectsNausea, constipation, stomach discomfort, higher blood pressure3Headaches and urinary tract infections reported1
InteractionsNadolol, atorvastatin, raloxifene3Caffeine effects add up with other stimulants1

Reviewed . Half-life figures are shown only where the value Dose Track uses agrees with the cited source.

What does the weight evidence show?

Green tea: NIH describes a Cochrane review of 14 trials lasting 12 to 13 weeks (141 to 1,207 mg catechins a day). Weight fell 0.95 kg more than placebo, but not significantly in the 6 trials outside Japan, and NIH concludes any effect is small and not likely to matter clinically.1

Green coffee: a 2011 meta-analysis of 3 trials found 2.47 kg more loss than placebo, but all trials had a high risk of bias.2 NIH notes another small trial reporting large losses was strongly criticized by the FTC, and two of its three authors retracted it.1

These are study protocols, not personalized advice; confirm any dosing with your prescriber.

What about the liver?

NCCIH says liver injury, though uncommon, has been reported mainly with green tea extract tablets and capsules, and people with a specific immune gene variant (5% to 15% of Americans) appear more susceptible.3 NIH describes a 12-month trial in which extract with 843 mg of EGCG a day raised liver enzymes, and notes the US Pharmacopeia advises taking extracts with food.1

Both can contain caffeine. More detail: Xenical vs Wegovy: what do the labels show?, and the Green Tea Extract (EGCG) and Green Coffee Bean Extract guides.

This page summarizes labels and published studies. It is not personalized medical advice; confirm any dose or change with your prescriber.
Xenical vs Wegovy: what do the labels show?Fat-blocking capsule vs weekly GLP-1 Berberine vs metformin: how do they compare?Plant supplement vs first-line diabetes drug Curcumin vs ginger: how do the two roots compare?Two related roots with different evidence

Frequently asked questions

Does green tea extract help weight loss?+
Only slightly if at all: about 0.95 kg more than placebo, and no significant difference outside Japan.1
Does green coffee bean extract work?+
The evidence is poor: 3 trials, all at high risk of bias, and one widely publicized trial was retracted.21
Can green tea extract hurt the liver?+
It can, though rarely; NIH counts at least 50 case reports since 2006, mostly with extract pills.13
Do they contain caffeine?+
Usually. A brewed cup of green tea has about 45 mg; green coffee extract has caffeine unless decaffeinated.1
Can I track these in Dose Track?+
Yes. Log each with reminders and track your weight alongside.

Sources

  1. NIH Office of Dietary Supplements. Dietary supplements for weight loss, fact sheet for health professionals (updated May 18, 2022).
  2. Onakpoya I, Terry R, Ernst E. The use of green coffee extract as a weight loss supplement: a systematic review and meta-analysis of randomised clinical trials. Gastroenterol Res Pract. 2011;2011:382852.
  3. NIH National Center for Complementary and Integrative Health. Green tea (updated February 2025).

All compound comparisons · Green Tea Extract (EGCG) guide · Green Coffee Bean Extract guide · All compound guides · Peptide tracking in Dose Track