Sports supplements abound, but most have not been proven to boost performance. Amino acids don’t appear to build muscle any better than the more balanced protein in food. Skip the protein powders, too. Serious athletes need slightly more protein than others, but most people get plenty of protein from food. Chromium picolinate, is touted for muscle building too, but the research is unclear.
Creatine, found in meat, fish and poultry, is also made in the body from amino acids. A few studies show that it improves performance in activities like sprinting and jumping, which requires short bursts of energy. But it won’t help recreational exercisers or endurance athletes.
Bottom line: Whether you’re a weekend warrior or a seasoned athlete, your best performance comes from eating a balanced diet and drinking plenty of fluids.