The Branched-Chain Amino Acids (BCAAs) are three essential nutrients with similar chemical structures – leucine, isoleucine and valine – used by athletes attempting to build muscle and increase physical endurance through improved exercise performance.

BCAAs are not produced by the body and must come from a balanced diet that includes foods high in protein -- particularly meat, dairy products and legumes -- combined with use of a dietary supplement as needed.

Regular BCAA supplementation schedules are used by many bodybuilders, weightlifters and endurance athletes like runners and cyclists trying to get the most out of their training sessions.

Several studies published in sports medicine and nutrition journals in recent years have found evidence that using BCAAs as a dietary supplement helps limit muscle damage, reduce recovery times and post-workout soreness, increase the burning of fat in muscle tissue and preserve stored muscle energy.

Research indicates that BCAAs provide an anabolic exercise effect by increasing the rate of protein synthesis in muscle building while also decreasing the rate of protein degradation, or muscle breakdown.

Clinical trials have found the supplementing the diet with BCAAs both before and after exercise sessions supports the hormone balance needed during high-intensity resistance training.

Exercise can increase serotonin levels in the body and cause fatigue. But BCAAs have been found to decrease serotonin levels, staving off fatigue and actually enhancing exercise performance.

The BCAAs are also used by those seeking to support mental focus and concentration, promote weight loss through exercise and physical activity and maintain muscle in older users engaged in weight-training activities.

BCAA Branched Chain Amino Acids - Pure Powder in Bulk Quantities (1 Kg (35.2 ounces))

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