Green Coffee Bean Extract
Also known as: GCE, Chlorogenic acid, Green coffee extract
Chlorogenic acids are polyphenols that may modestly reduce intestinal glucose absorption and influence glucose-6-phosphatase. Weight-loss effects in human trials are small and study quality is variable.
Last reviewed: 2026-10-06 · 0 indexed studies
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Overview
Green coffee bean extract is made from unroasted coffee beans and standardised for chlorogenic acids, which are largely destroyed by roasting. It is marketed for weight management and glycaemic support; human evidence is mixed and early meta-analyses were affected by a retracted trial.
Mechanism & Function
Mechanism of Action
Chlorogenic acid inhibits glucose-6-phosphatase (preclinical) and delays intestinal glucose absorption, blunting postprandial glucose. Any caffeine present contributes mild thermogenic effects.
Physiological Role
No physiological role; a source of polyphenols plus variable caffeine.
Primary Pathways
Performance / Health Relevance
No performance relevance beyond any caffeine content.
Evidence Review
No human clinical studies indexed for this ingredient yet.
No meta-analyses or systematic reviews indexed for this ingredient yet.
Dimensions marked N/A have no indexed evidence of that class. They are shown as unavailable rather than scored.
Practical Use & Dosage
- Minimum Effective Dose
- ~200 mg chlorogenic acid/day in trials
- Optimal Range
- 400–800 mg extract/day standardised to 45–50% chlorogenic acids
- Upper / Caution Level
- Limited by caffeine content if not decaffeinated
- Timing
- Before meals
- Best Format
- Extract standardised for chlorogenic acid content
- Bioavailability
- Chlorogenic acids are partly metabolised by gut microbiota before absorption.
- Absorption Considerations
- Check caffeine content — varies widely between products.
Safety & Interactions
Side Effects
- •Caffeine-related effects (if not decaffeinated)
- •Mild GI upset
Contraindications
- Caffeine sensitivity (for non-decaffeinated extracts)
Drug Interactions
- •Diabetes medications (additive glucose-lowering, theoretical)
Who Should Avoid
- •People sensitive to caffeine (unless decaffeinated)
Monitoring
Monitor blood glucose if combined with antidiabetic medication.
Frequently Asked Questions
Auto-generated from indexed evidence — dosage, safety, interactions, and more.
When is Green Coffee Bean Extract typically used or indicated?
Green Coffee Bean Extract is most commonly used for: Weight-management formulas, Metabolic-health blends. No physiological role; a source of polyphenols plus variable caffeine.
How does Green Coffee Bean Extract work?
Chlorogenic acid inhibits glucose-6-phosphatase (preclinical) and delays intestinal glucose absorption, blunting postprandial glucose. Any caffeine present contributes mild thermogenic effects.
What is the recommended dose of Green Coffee Bean Extract?
The optimal range is 400–800 mg extract/day standardised to 45–50% chlorogenic acids. with a minimum effective dose of ~200 mg chlorogenic acid/day in trials. Best taken: Before meals. Upper / caution level: Limited by caffeine content if not decaffeinated.
What are the side effects of Green Coffee Bean Extract?
Reported side effects include: Caffeine-related effects (if not decaffeinated); and Mild GI upset. Monitoring: Monitor blood glucose if combined with antidiabetic medication.
Does Green Coffee Bean Extract interact with medications?
Known or theoretical interactions: Diabetes medications (additive glucose-lowering, theoretical). Always check with a clinician before combining with prescription medication.
Who should avoid Green Coffee Bean Extract?
Green Coffee Bean Extract is generally not recommended for: People sensitive to caffeine (unless decaffeinated); and Caffeine sensitivity (for non-decaffeinated extracts).
How strong is the evidence for Green Coffee Bean Extract?
Evidence level: Preliminary (overall score 30/100), based on 0 indexed studies on SuppIndex.
Research & References (0)
No studies match this filter
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Research Overview
Preliminary EvidenceCite this ingredient
One-click citation export in APA, MLA, Chicago, BibTeX, or HTML. The URL below is stable and safe to link.
Stable URL
https://thesuppindex.com/ingredients/green-coffee-bean-extract
SuppIndex. (2026). Green Coffee Bean Extract: Evidence summary, dosage and clinical studies. Retrieved October 16, 2026, from https://thesuppindex.com/ingredients/green-coffee-bean-extract
Based on 0 indexed studies · Evidence level: Preliminary.
Goal Ratings
Stack Compatibility
Often stacked with chromium or white kidney bean in weight-management products.