These pills take away the desire to eat and allow you to ingest fewer calories as your food cravings decrease. Their components usually affect our brain making us feel full longer. Mostly appetite suppressants are prescribed and their active ingredients are chemicals that have side effects. There are natural appetite suppressants also. With the growing popularity of natural appetite suppressant Hoodia Gordonii too many frauds appeared on the market. You can see lots of products claiming to contain original Hoodia Gordonii but there are no real evidences that this is true.