Controversy has always surrounded prohormones.  Prohormones are substances which can be expected to be converted into hormones by the body upon ingestion. The obvious question that comes to mind is "isn't that what steroids are?" Not quite. Steroids are actual hormones, so another substance which will become hormones were a sort of technicality in which people could legally acquire the effects of steroids.  Since they are not steroids, aren't they safe?

While training methods have certainly been updated, and we know much more about nutrition in general, there is no segment of the weight trainers repertoire which has changed as much as supplementation. In the early days, there was virtually nothing available, but as the number of gyms in America exploded, so did the development of what would become known as nutritional supplements. With more demand came more research, and the latest products are more effective than the ones from as recent as the previous year.