Green Coffee Extract
Green coffee extract is made from unroasted coffee beans and contains chlorogenic acids and caffeine.
What it is studied for
The strongest rated effects first. Bars show the size of the effect, the letter grades the evidence, and each rating lists the studies behind it.
What makes the coffee green?
Green coffee extract comes from unroasted coffee beans. These contain more chlorogenic acid than roasted beans, as well as caffeine; decaffeinated extracts also exist. An extract is therefore not defined by its caffeine content alone. 1
Why study it for metabolism?
NIH describes experimental findings involving fat accumulation and glucose metabolism, with reduced intestinal glucose absorption proposed as one mechanism. Such mechanisms help explain the research question; they do not predict how much weight a person will lose. 1
Why people take it
SuppCo community snapshot, 2026-09-28. Reasons for use are not evidence that it works.
Questions people ask
Is green coffee extract caffeine-free?
Not necessarily. Green beans contain caffeine, although decaffeinated extracts are available. 1
Were large weight losses demonstrated?
The pooled average difference in the 2020 analysis was about 1.2 kg compared with control. 2
Does a short study establish long-term safety?
No. NIH explicitly describes the safety evidence for green coffee extract as inadequately studied. 1
Cocoa Extract
Chlorogenic Acid
Green Tea Extract
EGCG