The most common type we can easily find on the market is the trim-fast appetite suppressants. In these suppressants, there are "HTP enzymes" which function to tie the production development regarding certain chemicals in our brain such as catecholamine and serotonin. This is intended to keep us feeling full for a longer time. Some capsules come with "GLP 1" hormonal action that also serves the similar reason.
Alternatively, the metabolism boosters come with "Guarana" with additional caffeine than we can perhaps find in coffee. This is meant to give a boost to our resistance power as well as to burn our fat off. But, there are some herbal alternatives to this product available in the market. So, if you are really looking for weight reducing pills; go green.
If you are in need of weight loss trim fast pills which are safe to use and don't have any side-effects. You can try Acai Berry Blast Capsules; these pills are made of natural elements and are confirmed clinically to be very safe.