A cheap multi and fish oil for those who don’t regularly eat fish. Those who avoid dairy can benefit from a calcium/vitamin D supplement. I don’t really see protein powder as much as a supplement as it is a convenient food product. Beyond that, the only legal stuff that really works is creatine. People get a boner over BCAA supps but don’t realize that about 20% of their protein intake consists of BCAA. Fat burner supps for the most part suck ass, especially in habitual caffeine consumers. Nevertheless, all supps work if you take it with a dose of expectation bias from believing in their marketing. The placebo effect is the most powerful supplement of all.