What is a Prohormone?
A prohormone, as is, has very little hormonal impact. It is a hormonal precursor. Once it is digested by the body, it is transformed, and acts just like an anabolic steroid.
For weight lifters, prohormones assist the body in growing muscle, and in gaining strength. Prohormones have the same side effects as steroids.
Since some prohormones are not listed as an anabolic steroid themselves, they are legal.