Optimum nutrition bcaa 1000mg uses a blended branched chain amino acid formular bcaas are essential within your diet as they are not able to be synthesised by the human body and these optimum nutrition 1000mg amino acid supplements are the ideal solutionr the optimum nutrition branched chain amino acids also come in easy to swallow capsules and can be taken any time between meals 30 45 minutes before workouts andor immediately after workoutsr optimum nutrition bcaa contains 3 amino aci