l arginine vs l citrulline vs l carnitine Yes — the ones we were talking about are L-Citrulline and L-Arginine. 1. L- — more efficient, that's what watermelon converts to anyway. Usually sold as L-Citrulline or Citrulline Malate powder/capsule. 2 L-Citrulline vs. L-Arginine: What's the
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