The US Anti Doping Agency (USADA) has created a great resource (Supplement411) for sport coaches, parents, athletes and administrators to provide a trusted source of information on nutritional supplements.
USADA created this resource as they believe there is confusion over what constitutes a dietary supplement. There are differences between what classifies a product as a dietary supplement or as medication or as a food or as a drink and most people, and in some cases the companies themselves, do not fully understand the differences.
To learn more go to Supplement 411 for more information.