There are a number of products on the market that promise to speed up metabolism and help people lose weight and burn fat. Kola nut powder contains caffine and it is used by some as a fat burner and metabolism booster. Also known as bitter kola nut, this nut is believed by some to help people lose weight. Caffine can have harmful effects and should only be taken in moderation. It is always important to speak with your doctor before taking any types of supplements or powders. If you are on any other types of medicines you will have to be aware of potential interactions.