EAAs (Essential Amino Acids Blend)
Commonly used for
Muscle & StrengthAthletic Performance
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What is it? / Overview
EAAs, particularly leucine, activate mTORC1 signaling; because the body can't synthesize essential amino acids, supplying a free-form EAA blend rapidly raises plasma EAA levels and directly drives muscle protein synthesis more efficiently than an equivalent amount of intact protein. This is an established mechanism per the ISSN's own position stand, with the strongest functional benefit in older or anabolic-resistant adults.
How is it used? / Administration
Form: Free-form blend of all 9 essential amino acids, typically leucine-enriched -- superior to standalone BCAAs (which lack the other 6 EAAs required for sustained muscle protein synthesis)
Typical dose studied: 1.5-3 g stimulates muscle protein synthesis at rest; ~10-15 g leucine-enriched used around exercise
Timing: Around exercise and/or between meals; requirements rise during a caloric deficit
Distinct from the existing BCAAs entry (see that separate entry), which already recommends EAAs/complete protein as the more physiologically complete alternative for muscle-building goals -- this entry is that recommended alternative, made explicit as its own database item.
How well does it work? / Evidence
✓ Well-established
Who should avoid it?
Avoid with: Chronic kidney disease (Stage 3, 4, or 5) — NOT on dialysis; Dialysis (Hemodialysis or Peritoneal Dialysis); End-stage liver disease / Cirrhosis
Interacts with: Levodopa -- amino acids compete for absorption; separate dosing
Already taking it? Reasonable to continue -- the ISSN position stand endorses EAAs as preferred over standalone BCAAs. Benefit is most evident in older adults, dieters in caloric deficit, or those with otherwise inadequate protein intake; well-fed young athletes already eating enough protein see a smaller marginal benefit.
Research & references
Ferrando AA et al. (2023). International Society of Sports Nutrition Position Stand: Effects of Essential Amino Acid Supplementation on Exercise and Performance. Journal of the International Society of Sports Nutrition. Pasiakos SM et al. (2011). Leucine-Enriched Essential Amino Acid Supplementation During Moderate Steady State Exercise Enhances Postexercise Muscle Protein Synthesis. American Journal of Clinical Nutrition. Churchward-Venne TA et al. (2012). Supplementation of a Suboptimal Protein Dose With Leucine or Essential Amino Acids. The Journal of Physiology.
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