EAA (Essential Amino Acids)
A product containing all nine essential amino acids that the body cannot synthesize on its own. Research suggests that having the full complement of essential amino acids available is advantageous for muscle protein synthesis. BCAAs alone may leave other essential amino acids in short supply, and EAA is thought to provide a more complete substrate.
An ingredient with growing research
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Effects reported in research
Research reports promotion of muscle protein synthesis in individuals who train
Provides a more complete amino acid profile compared to BCAAs alone
May support muscle repair and recovery when taken around training sessions
Can serve as an alternative protein source in the peri-workout window when solid food is impractical
Dosage & timing
- 10–15 g per serving (aim for a product providing at least 2–3 g leucine).
- Commonly taken before, during, or after training.
- Additional benefit may be limited if total daily protein from food is already adequate.
Cautions
- •Generally considered safe, but excessive intake may cause gastrointestinal symptoms such as nausea or diarrhea in some individuals.
- •Anyone with kidney concerns or pre-existing medical conditions should consult a doctor before use.
- •Pregnant or breastfeeding individuals should seek medical advice prior to supplementation.
Supporting research
Branched-chain amino acids and muscle protein synthesis in humans: myth or reality?
Journal of the International Society of Sports Nutrition, 2017
The claim that dietary BCAA intake alone stimulates muscle protein synthesis is unwarranted. While leucine activates mTOR signaling, the absence of other essential amino acids (EAAs) means the body must catabolize existing muscle to obtain missing substrates. Maximal MPS requires the full complement of EAAs.
Protein supplementation augments resistance-training-induced gains in muscle mass and strength (meta-analysis)
British Journal of Sports Medicine, 2018
A synthesis of 49 RCTs (1,863 participants). Protein supplementation significantly increased gains in lean mass and 1RM from resistance training; benefits plateaued beyond about 1.6 g/kg/day of total protein.
Last checked: 2026-06-26