Americans spend more than $50 billion a year on dietary supplements. Most of it is wasted. Some of it is actively harmful. A small slice is genuinely useful — and the useful slice is rarely what's being marketed hardest. Here's an honest audit of the supplements I see in clients' cabinets most often. I'm naming names. I am not paid by any of these companies. Supplements with strong evidence (worth considering) Creatine monohydrate. The most-studied sports supplement in existe