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Muscle protein synthesis (MPS) — the process your body uses to repair and build muscle after exercise — doesn't just need protein. It needs the right protein. Specifically, it needs all 9 essential amino acids present at the same time, in adequate amounts. Your body can't produce essential amino acids on its own. You have to eat them. And if even one is missing or too low, MPS stalls — like a production line missing a critical part. Pea protein is high in leucine (the primary trigger for MPS) but critically low in methionine. That methionine deficiency acts as a bottleneck: even if every other amino acid is abundant, your body can't fully complete the protein synthesis process without adequate methionine. This is why plant proteins are often labeled "incomplete" — and why most plant protein powders fail to deliver the muscle-building results people expect.