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BCAA (Branched-Chain Amino Acids) — three branched aminos: leucine, isoleucine, and valine. These are the only amino acids the muscle uses directly as energy, without liver processing. That is why they became the "magic trio" of 1990s sports nutrition.
Why BCAA? Leucine is the primary trigger of protein synthesis. Isoleucine and valine are anti-catabolic, reducing muscle breakdown during intense training. Dose: 5-10g before, during, or after training.
When choosing BCAA, the key factors are correct ratio and a clean formula.
Leucine / isoleucine / valine at 2:1:1 — the optimal ratio per research. Example in a 5g BCAA serving: 2.5g leucine, 1.25g isoleucine, 1.25g valine. Some formulas push 4:1:1, 8:1:1, or higher — these are marketing ratios, no real advantage over 2:1:1.
If you already hit your daily protein target (1.6-2.2g/kg), BCAA-s additional benefit is small. Research shows BCAA-s main value appears: on low-protein diets, for fasted training (empty stomach), and during caloric deficits. If your protein intake from food or whey is sufficient, paying for separate BCAA is often a waste.
Modern research shows EAA (all 9 essential amino acids) is more effective for protein synthesis activation. BCAA-s three aminos are not enough — complete protein synthesis requires all 9 EAAs. If you want an amino acid supplement, EAA is the optimal choice.
