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If you’re looking to build muscle and cut fat then you really need to be thinking about BCAA’s. Branch Chained Amino Acids (also known as BCAA’s) are the building blocks of protein. Like with most supplements, all the amino’s required to build muscle can be found in regular food. If you’re looking to build muscle and cut fat then you really need to be thinking about BCAA’s. Branch Chained Amino Acids (also known as BCAA’s) are the building blocks of protein. Like with most supplements, all the amino’s required to build muscle can be found in regular food.