Raspberry ketone is a chemical from red raspberries that is thought to help for weight loss. Some research in animals or in test tubes shows that it might increase some measures of metabolism. It might also affect a hormone in the body called adiponectin.ASPBERRY KETONE Side Effects & Safety. There isn’t enough information available to know if raspberry ketone is safe to take as a supplement. Raspberry ketone has never been scientifically studied in humans to determine if it causes side effects.