Wilhelm Schanzer, who is the head of the International Olympic Committee drug testing program, investigated 100 of the most widely used nutritional supplements. Well, he found that 16 of them actually contained the anabolic steroid known as Deca Durabolin, aka Nandrolone.
Also, researchers out of Denmark discovered that supplements such as BCAA’s CLA, creatine, and glutamine, among many others, were some of the most popular supplements to be laced with illegal ingredients.
As explain in one of the articles I posted up on this muscle building blog, this is done to make unsuspecting users think that the supplement works, in fact what’s working is not the advertised supplements, but in fact, the illegal ingredient, usually some form of anabolic steroid or prescription medication that can be used for fat burning, like Clenbuterol. Once people catch wind that this supplement supposedly works, and that reputation gets around, then the stop putting the ingredient that actually works in the batches, and purchasers are left with a pile of garbage for a supplement.