Beta-alanine is a non-essential, natural occurring amino acid in the body synthesized by the liver, converted into protein. Beta-alanine is produced naturally, but sometimes you may need or want an extra boost. Many weightlifters and bodybuilders use the supplement before workouts to be able to train more efficiently. Research states that the supplement may help significantly reduce fatigue and limit lactic acid buildup in the muscles, possibly allowing you to work out harder and longer.