Amino acid supplementation

Amino acid supplements are most useful when they fill a specific dietary gap; they generally aren’t necessary if your overall protein intake is adequate.

• Essential amino acids (EAAs) vs. BCAAs: If total protein is low, EAAs are a better first choice than BCAAs. They may be used around training, but adding them on top of adequate protein is optional and may offer only a small benefit. 1
• Leucine and muscle: For muscle support, the discussion emphasizes getting enough leucine with meals—roughly 700–3,000 mg per meal—preferably from food. Supplementation may help when a meal is low in protein, but relying on leucine alone is discouraged because the broader amino-acid supply matters. 2 3
• Glutamine: Galpin describes 20 g/day, often split into 10 g morning and evening, as a recovery-related option in specific high-stress or injury contexts—not simply as a protein-synthesis supplement. Huberman also discusses glutamine for sugar cravings, while noting the evidence is still limited; increase it gradually because larger doses can cause stomach distress. 4 5

In short, prioritize adequate protein from food, and consider amino acid supplements mainly when a specific need makes it difficult to meet that target.