Raspberry Ketones were originally looked at for their fat loss purposes because of their similar chemical structure to some other very well known fat loss agents.  I know you’ve heard of Ephedrine.

Researchers found that supplementing with Raspberry ketones, more hormone sensitive lipase (HSL), makes it into the vesicles that fat cells store their fatty acids.  Raspberry ketones directly stimulate fat cells to mobilize and excrete their fatty acids, resulting in fat loss.