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GNC Amp Gold Series BCAA Supplement 400g is enriched with a perfect ratio of all three BCAAs with more emphasis on Leucine, which is one of the main amino acids when it comes to muscle strength and recovery. It activates protein production for muscle growth and repair along with three important nutrients. L-citrulline is a precursor to arginine that promotes vasodilation and pumping, which also helps deliver nutrients to muscles efficiently by increasing blood circulation to muscles. Leucine stimulates muscle production and strength, which influences blood sugar before and during exercise. Valine inhibits muscle breakdown during exercise and stimulates metabolism and muscle growth, while isoleucine helps produce energy and stimulates nitrogen growth in muscle cells.