Boots WebMD Partners in Health
Return To Boots

Vitamins & minerals health centre

Green coffee

One of the newest supplements to hit the shops claiming to help with weight loss is green coffee. It’s available as a concentrated extract, as a supplement or as an instant coffee blend and claims to be beneficial to heart health by reducing high blood pressure.

We look at the evidence for green coffee extract or GCE.

How is green coffee different from regular coffee?

Coffee beans are roasted to give them their distinctive dark colour and rich flavour. Green coffee beans are raw and unroasted. They contain a greater concentration of chlorogenic acid, a natural substance that can influence metabolic processes. Chlorogenic acid is partially destroyed during the roasting process but an average cup can still provide around 70-350mg. Studies on GCE in humans have used doses of 700-1100mg a day.

Weight for weight, green coffee contains the same amount of caffeine as regular roasted coffee, but most supplements provide around 20mg caffeine per capsule. With 2-4 capsules a day, this supplement provides a similar amount of caffeine as one cup of coffee. If you’re sensitive to caffeine these supplements aren’t for you. They are not recommended for use during pregnancy and breastfeeding.

In summary, the chlorogenic acid content of green coffee extract has been suggested to lower blood pressure, help the body control blood sugar levels, and act as a weight loss aid. However, the lack of high quality human studies means these claims remain unproven.

Although suggested as able to lower blood pressure, at least one study showed a rise in blood pressure in those taking green coffee supplements.

Based on current medical knowledge, there is no robust evidence to support taking green coffee or its extracts as a means to control blood pressure, blood sugar or weight.

Dietitian reviewed by Catherine Collins RD

WebMD Medical Reference

Medically Reviewed by Dr Rob Hicks on June 15, 2015

Stay informed

Sign up for BootsWebMD's free newsletters.
Sign Up Now!

Popular slideshows & tools on BootsWebMD

woman coughing
Home remedies for coughing
smiling baby
Causes and remedies
man holding sore neck
16 tips when you have a lot of weight to lose
mother and child
Caring for a baby with cows' milk allergy
woman holding mouth
What causes sensitive teeth?
man holding sore neck
8 signs you're headed for menopause
man holding sore neck
The best time to do everything
bain illustration
Best foods for your brain
woman doing situps
7 most effective exercises
avacado on whole wheat crackers
Plenty to choose from
egg in cup
Surprising things that can harm your liver