BCAA vs Beta-Alanine Supplements: Which Should You Take? As someone who lifts most days, I've been taking branched-chain amino acids (BCAAs) for years. Since there's loads of evidence that they improve body composition, strength, endurance, and recovery , you can get them on Myprotein for a tenner, and they make water taste good, it's almost a no-brainer. David Robinson, PhD UK Fitness ProFeb 17 · 12 min read