I know I sound like a broken record, but here is a 'capsule' summary on some of the substances we regard as beneficial:
Protein: has been shown to induce protein synthesis. Problem is, protein synthesis has not been proven to induce long-term muscle growth.
Vitamin D: researchers are pretty down on it these days.
Multi-vitamins: may increase mortality risk in older women.
Glucosamine: no large studies show that it's effective.
Calcium: merely doubling normal intake may double risk of heart attack death in women.
Mood-stabilizers: may cause us to shoot schoolchildren, cops and their families. Studies ongoing.
Aspirin: not the 'miracle drug' anymore. Protection against heart attack negligible and, of course, may be hard on stomach.
beer: granted, this may be a miracle drug.