Buy high-quality L-Leucine (L-2-Amino-4-Methylpentanoic Acid), CAS 61-90-5. With ≥98.5% purity (HPLC), our L-Leucine meets USP/EP/JP standards, suitable for pharmaceutical and nutritional applications. This white crystalline powder, molecular formula C₆H₁₃NO₂, is essential for muscle protein synthesis and overall health.