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Why Leucine Matters More Than Just “Getting Protein” For years, people have focused almost entirely on total protein intake when it comes to building muscle. But there’s another piece of the puzzle that many overlook — and it may be one of the most important factors for muscle growth and recovery: Leucine. Leucine is one of the three branched-chain amino acids (BCAAs), but unlike the others, it acts as a powerful trigger for muscle protein synthesis — the process your body us