This article has two parts: part one,

which you are reading now, will discuss the various types of legal

pro-drugs (AKA pro-hormones, STEROIDS) that are, or have been available over the

last 5-6 years. Learn the differences between them all!   The idea of

consuming a product with limited or no biological activity in itself,

which can then be enzymatically altered by the body to produce a

secondary metabolite with high biological activity is by no means a new

concept. This "idea" has been utilized by all aspects of the

pharmaceutical industry for decades. However, this idea is relatively

novel with regards to the sports supplement market. As we emerge out of

the infancy of the legal pro-drug in the sports supplement industry it

is both valuable and entertaining to look back and see just how far we

have progressed in under a decade.