Optimum Nutrition BCAA is the best BCAA pill on the market that will support your active lifestyle. Each capsule has a 2:1:1 ratio of leucine, isoleucine, and valine for optimal results. The supplement can be used between meals, before training, or after finishing your workout to augment your daily intake of amino acids. The recommended usage is two capsules with your favorite beverage to support muscle building and exercise recovery.