EAAs
Essential Amino Acids
Complete essential amino acid blend that maximizes muscle protein synthesis — superior to BCAAs alone.
Essential Amino Acids (EAAs) include all 9 amino acids the body cannot produce: leucine, isoleucine, valine (the BCAAs), plus histidine, lysine, methionine, phenylalanine, threonine, and tryptophan. Unlike BCAAs alone, EAAs provide everything needed for complete muscle protein synthesis. Research shows EAAs are more effective than BCAAs for muscle building and recovery.
Mechanisms of Action
MPS Activation
Triggers muscle protein synthesis
Anti-Catabolic
Prevents muscle breakdown during training
Recommended Dose
10-15g EAAs (containing 3-4g leucine)
Optimal Timing
- Intra-workout
- Post-workout
- Between meals
Can be taken without food
Best Form
Free-form EAA powder (instantized for mixing)
Alternatives: EAA capsules, EAA tablets
Free-form amino acids absorb faster than protein. Powder allows precise dosing. Often flavored due to bitter taste.
Duration
Minimum: ongoing
Optimal: ongoing
Cycling: Not required
Note: Most beneficial during/around training or between meals when protein intake is low. Not necessary if protein intake is already adequate.
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Muscle Protein Synthesis
Increased MPS rates
Reduced Soreness
Less DOMS after training
Muscle Preservation
Reduced catabolism during dieting
Generally safe and beneficial
Who Should NOT Take This
- Maple syrup urine disease (BCAA metabolism disorder)
Drug Interactions
Amino acids may compete for absorption
Possible Side Effects
Tip: Reduce dose; dilute more
Tip: Use flavored products
Warnings
- Not a replacement for adequate protein intake
- Most benefit seen in those with low protein intake or training fasted
Top studies from 40+ peer-reviewed papers
Khani Y et al. • Journal of orthopaedic surgery and research (2025)
“Protein and amino acid supplementation can reduce muscle atrophy in hip or knee arthroplasty patients.”
Key Findings:
- Essential amino acids (EAA) significantly reduced muscle atrophy in quadriceps femoris muscle mass (SMD: 0.69; 95% CI: 0.44 to 0.95) and hamstring muscle mass (SMD: 1.04; 95% CI: 0.52 to 1.55).
- Protein and amino acid supplementation can reduce muscle atrophy in hip or knee arthroplasty patients.
- While effects on muscle strength and function are mixed, intravenous supplementation offers benefits.
- Further standardized research is needed to confirm these findings.
Wunderle C et al. • Nutrients (2024)
“Further studies should investigate the effect of supplementation of methionine in this patient group to improve outcomes.”
Key Findings:
- In a model adjusted for comorbidities, sex, nutritional risk, and trial intervention, low plasma methionine levels were associated with 30-day mortality (adjusted HR 1.98 [95% CI 1.16 to 3.36], p = 0.01) and with a decline in functional status (adjusted OR 2.06 [95% CI 1.06 to 4.01], p = 0.03).
- The results for lysine and threonine did not show statistically significant differences regarding clinical outcomes.
- These findings suggest that low levels of methionine may be critical during hospitalization among patients at nutritional risk.
- Further studies should investigate the effect of supplementation of methionine in this patient group to improve outcomes.
Hernández-Lepe MA et al. • Nutrients (2023)
“This systematic review was registered in PROSPERO, ID: CRD42022344284.”
Key Findings:
- A total of 16 studies met the inclusion criteria and were included in this systematic review.
- Regular resistance exercise together with daily essential amino acids or whey protein and vitamin D supplementation improve the maintenance or gains in appendiceal/skeletal muscle mass and total lean mass in sarcopenic older adults.
- The data suggest a synergistic effect not only on the primary outcome, but also on other variables such as strength, speed, stability, and other indicators of quality of life.
- This systematic review was registered in PROSPERO, ID: CRD42022344284.
Cunha N et al. • Nutrients (2023)
“Insect protein is an adequate protein source with promising health benefits; however, further research is needed to fully understand its potential and optimise its inclusion into the human diet.”
Key Findings:
- The effects on inflammatory markers and microbiota composition were inconclusive and the studies did not show significant effects on appetite regulation.
- Allergenicity assessments revealed a sensitisation and cross-reactivity between insect allergens and known allergens.
- A partial reduction of cross-allergenicity was observed via thermal processing.
- Insect protein is an adequate protein source with promising health benefits; however, further research is needed to fully understand its potential and optimise its inclusion into the human diet.
Piri Damaghi M et al. • The British journal of nutrition (2022)
“Whey protein supplementation significantly improved body composition via increases in lean body mass, without influencing fat mass, body mass and body fat percentage.”
Key Findings:
- Thus, we sought to perform a meta-analysis of published randomised clinical trials that examined the effect of whey protein supplementation and soya protein supplementation on body composition (lean body mass, fat mass, body mass and body fat percentage) in adults.
- We found a significant increase in lean body mass after whey protein supplementation (weighted mean difference (WMD: 0·91; 95 % CI 0·15, 1·67; P = 0·019).
- We observed no significant change between whey protein supplementation and body mass, fat mass and body fat percentage.
- Whey protein supplementation significantly improved body composition via increases in lean body mass, without influencing fat mass, body mass and body fat percentage.
Study Type Distribution
Goals This Supplement Supports
Related Goals
This information is for educational purposes only and is not intended as medical advice. Always consult a qualified healthcare provider before starting any supplement.