During exercise, your body needs as much energy as possible for optimum performance. Some gym goers opt to use supplements to support their workout, helping to maximise their desired results. Some options include BCAA and HMB supplements – they can be taken together or separately. HMB is a metabolite of leucine, which is a branched-chain amino acid that can’t be naturally produced in the body. Leucine is part of the trio that make BCAAs alongside isoleucine and valine. However, leucine tends to be the main component, which is why it is usually the highest in the ratio of the three.