GCBest® (Green Coffee Bean Extract)

GCBest® is a green (unroasted) coffee bean extract standardized for chlorogenic acid, the polyphenol largely lost during roasting. Green coffee extract is studied for supporting modest weight management and healthy metabolism.

GCBest is researched primarily for Weight Management and Metabolic Health. A meta-analysis found chlorogenic acid from green coffee supported modest reductions in body weight.

The clinically studied dose is Commonly 200 to 400 mg of green coffee extract per day. Always follow the product label and check with a healthcare provider for personal advice.

For most healthy adults, GCBest is well tolerated at studied doses. Reported effects can include: Generally well-tolerated. Contains caffeine; can cause jitteriness or sleep trouble. It may also interact with some medications. GCBest is not right for everyone, so check with a healthcare provider first if you are pregnant or breastfeeding, have a medical condition, or take prescription medication.

Possible interactions include: Stimulant medications — caffeine content may add effects; use caution. Diabetes medication — monitor blood sugar. If you take prescription medication, check with a pharmacist or doctor before using it.

NutraSmarts rates the evidence for GCBest as Limited (2 out of 5). It is backed by 1 clinical trial and 1 cited reference summarized on this page. A higher rating reflects more, larger, and better-designed human studies.