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EAAs (Essential Amino Acids) — Frequently Asked Questions

This content is for informational purposes only and does not constitute medical advice. Consult your healthcare provider before starting any supplement. Full disclaimer

Frequently Asked Questions

Are EAAs better than BCAAs?

Yes, for muscle protein synthesis. BCAAs (leucine, isoleucine, valine) initiate the mTOR signaling cascade but cannot sustain full MPS without the other 6 essential amino acids. Wolfe (2017) demonstrated that BCAAs alone provide only a transient, incomplete anabolic response. EAAs contain all 9 essential amino acids and stimulate complete MPS. If choosing one, EAAs are the better investment.

Do I need EAAs if I eat enough protein?

If you consistently consume 1.6-2.2 g/kg protein daily from complete sources (meat, eggs, dairy, soy), additional EAAs provide minimal benefit. EAAs are most useful when total protein is suboptimal, during fasted training, between meals with no protein, or for older adults who may have reduced MPS response to standard protein meals.

How much EAA equals a serving of protein?

Approximately 6-10 g of EAAs provides an anabolic stimulus comparable to 20-25 g of whey protein. However, EAAs are not a complete protein replacement — they lack non-essential amino acids and calories. They are best used as a targeted MPS trigger rather than a meal replacement. A 10 g serving of EAAs has roughly 40 calories vs 120 for a whey shake.

Full EAAs (Essential Amino Acids) Guide

References

  1. (). Branched-chain amino acids and muscle protein synthesis in humans: myth or reality?. Journal of the International Society of Sports Nutrition. DOI
  2. (). Essential amino acids and muscle protein recovery from resistance exercise. American Journal of Physiology-Endocrinology and Metabolism. DOI
  3. (). Amino acid ingestion improves muscle protein synthesis in the young and elderly. American Journal of Physiology-Endocrinology and Metabolism. DOI