Green coffee extract comes from unroasted coffee beans. Keeping the beans raw preserves chlorogenic acids that roasting would destroy. The extract also contains a small amount of caffeine.
Companies sell it mainly for weight management. Chlorogenic acids might affect how the body handles glucose and fat. Human data, however, are mixed and lack strong confirmation.
Dosage depends on the specific product. Most instructions say to take it on an empty stomach 30 to 60 minutes before meals. The caffeine can give a mild energy lift. Side effects match those of caffeine: trouble sleeping, jitters, and a faster heartbeat. This extract may interact with medicines for blood pressure and diabetes. Check with a doctor if you are pregnant, nursing, or taking any medication.