Green Coffee Extract (Chlorogenic Acid)

Also known as: Coffea arabica green bean extract · Chlorogenic acid · GCA (Green Coffee Antioxidant)

●●○Moderate Evidence

Unroasted coffee rich in chlorogenic acids. Roasting destroys these actives — green coffee provides blood sugar and blood pressure benefits that brewed coffee lacks.

Effective Dose

400–800mg / day

per clinical evidence

Evidence Level

Moderate

Superfoods & Botanicals

Mechanism

Chlorogenic acid — glucose-6-phosphatase inhibition, alpha-glucosidase inhibition

primary action

Best For

Blood sugar

Weight management, Blood pressure, Antioxidant

This profile is for informational purposes only and does not constitute medical advice. Consult a qualified healthcare professional before starting any supplementation, especially if you have pre-existing conditions or take medications.

What Is Green Coffee Extract (Chlorogenic Acid)?

Green (unroasted) coffee beans contain high concentrations of chlorogenic acids — polyphenols that are largely destroyed by roasting. Chlorogenic acids inhibit hepatic glucose production (glucose-6-phosphatase inhibition) and reduce glucose absorption (alpha-glucosidase inhibition), producing blood glucose and blood pressure benefits distinct from caffeine.

How It Works: The Science

Chlorogenic acid inhibits glucose-6-phosphatase in the liver, reducing hepatic glucose output (similar to metformin's secondary mechanism). It also inhibits alpha-glucosidase in the gut, slowing carbohydrate absorption. Additionally, it activates AMPK and has antioxidant activity via Nrf2 pathway.

Primary Mechanism

Chlorogenic acid — glucose-6-phosphatase inhibition, alpha-glucosidase inhibition

Evidence-Based Benefits

Reduces fasting blood glucose and improves insulin sensitivity

moderate

Thom (2007) — 200mg chlorogenic acid supplement significantly reduced glucose response

Reduces blood pressure in mildly hypertensive adults

moderate

Kozuma et al. (2005) — 140mg chlorogenic acid/day significantly reduced SBP and DBP

Dosage Guide

Effective Dose

400–800mg / day

400–800mg green coffee extract (standardised to 45–50% chlorogenic acids) before meals. Standardised products are essential — chlorogenic acid content in non-standardised powders is highly variable.

Safety Profile & Side Effects

Contains caffeine (less than brewed coffee but present) — account for total caffeine intake. May cause GI upset. Blood sugar-lowering effect relevant for diabetics on medication.

Who Should (and Shouldn't) Take It

Best for

Blood sugarWeight managementBlood pressureAntioxidant

Who it's for

Those with blood sugar and blood pressure concerns wanting a food-derived, antioxidant-rich supplement. A good complement to berberine for comprehensive blood glucose management.

Frequently Asked Questions

What is the recommended dose of Green Coffee Extract (Chlorogenic Acid)?

Is Green Coffee Extract (Chlorogenic Acid) safe?

Contains caffeine (less than brewed coffee but present) — account for total caffeine intake. May cause GI upset. Blood sugar-lowering effect relevant for diabetics on medication.

How does Green Coffee Extract (Chlorogenic Acid) work?

Who should take Green Coffee Extract (Chlorogenic Acid)?

Those with blood sugar and blood pressure concerns wanting a food-derived, antioxidant-rich supplement. A good complement to berberine for comprehensive blood glucose management.

Related Ingredients

Berberine Cinnamon Extract (Ceylon / Cassia)Apple Cider Vinegar (Acetic Acid)

Medical Disclaimer

Ingredient profiles are for informational purposes only and do not constitute medical advice. Consult a qualified healthcare professional before starting any supplementation, especially if you have pre-existing conditions or take medications. Full disclaimer →