I was shocked to see how many different stimulants there are in so many other supplements on the market. Many of them contain caffeine and other stimulants that are supposed to promote weight loss. Many of them also have unnatural products such as ephedrine. It is good to know that Calotren contains none of these things. It is an all natural supplement that is designed to work with your body to stimulate fat loss. It does not need any extra boost to get this started. This will also help the person to maintain weight loss once they stopped using the supplement.