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Eaa7.5
EAAs Research
Likely helpsHigh safety
40 peer-reviewed studies
What the evidence says
Likely helps
EAAs appears to help in 7 of 8 studies with measurable effects — the evidence leans clearly favourable.
Most evidence is from high-quality meta-analyses and randomised trials published 2008–2026 with a typical study size of 38 participants.
Based on 40 studies · 9 meta-analyses · 18 RCTs · 6,655 total participants
Confidence
High
What the studies found
7helped1didn't help· 32 more without graded effect data
By outcome
Lean body mass & muscle growthEnhanced muscle protein synthesis · Acute and cumulative
Likely helps27 studies
Muscle strength & powerEnhanced muscle protein synthesis · Acute and cumulative
Likely helps17 studies
Therapeutic & clinical
Probably helps13 studies
RecoveryFaster recovery between sessions · Acute
Mostly mechanism / observational6 studies
Weight management
Too few graded studies2 studies
Cognitive function
Too few graded studies2 studies
Endurance & exercise performanceReduces muscle breakdown during prolonged exercise · During exercise · Supports protein synthesis and training adaptations · Ongoing
Too few graded studies1 study
Energy & fatigueProvides substrate for energy production during exercise · During exercise
Too few graded studies1 study
By the numbers
Pulled from 35 studies with measurable effects
Likely real effects
83%
across studies
People studied
6,655
typical study: 38 people
Strongest designs
27
9 pooled, 18 randomised
Showed benefit
88%
7/8 studies
How long studies ran
1–3 months
5
3+ months
2
Populations Studied
Adults3
Older adults with sarcopenia3
Young adults2
Untrained young adults2
Active research area
28 studies in the last 5 years · Latest meta-analysis: 2026
200820172026
1Muscle atrophy reduction in quadriceps femorisMeta-AnalysisCited 7×n=903 · large study2025
Protein and amino acid supplementation can reduce muscle atrophy in hip or knee arthroplasty patients.
Khani Y et al. · Journal of orthopaedic surgery and research (2025)
Large benefit
← WorseNo effectBetter →
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.
2Kidney functionMeta-AnalysisCited 2×n=1,574 · large study2022
The very low-protein diets supplemented with nitrogen-free analogs had significantly better kidney functions results compared to the conventional low-protein diets in subjects with chronic kidney disease.
Yang W · Therapeutic apheresis and dialysis : official peer-reviewed journal of the International Society for Apheresis, the Japanese Society for Apheresis, the Japanese Society for Dialysis Therapy (2022)
The very low-protein diets supplemented with nitrogen-free analogs had significantly better kidney functions results compared to the conventional low-protein diets in subjects with chronic kidney disease.
Further studies are required to validate these findings.
3Lean body massMeta-AnalysisCited 6×n=596 · large study2022
Whey protein supplementation significantly improved body composition via increases in lean body mass, without influencing fat mass, body mass and body fat percentage.
Piri Damaghi M et al. · The British journal of nutrition (2022)
Noticeable benefit
← WorseNo effectBetter →
Likely real
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.
4Lean body massMeta-AnalysisCited 14×n=910 · large study2021
A mixture of macronutrients and an intervention duration as long as 48 weeks had some significant effects on improving lean body mass of patients undergoing dialysis.
Lu Y et al. · Journal of advanced nursing (2021)
A mixture of macronutrients and an intervention duration as long as 48 weeks had some significant effects on improving lean body mass of patients undergoing dialysis.
No effect of oral nutritional supplement on muscle strength or physical performance were found but with limited evidence.
Understanding the mechanisms that regulate skeletal muscle mass will help in developing effective treatments for muscle weakness.
Baumert P et al. · Journal of cachexia, sarcopenia and muscle (2024)
Like the hypertrophy stimulation with IGF-1 in myotubes in vitro, the concentration of the dipeptide l-carnosine was decreased by 26.6% (P = 0.001) during skeletal muscle growth in vivo.
However, phosphorylated sugar (glucose-6-phosphate, fructose-6-phosphate or glucose-1-phosphate) decreased by 32.2% (P = 0.004) in the overloaded muscle in vivo while increasing in the IGF-1-stimulated myotubes in vitro.
We demonstrated that labelled carbon from [U-13C6]glucose is increasingly incorporated by ~13% (P = 0.001) into the non-essential amino acids in hypertrophying myotubes, which is accompanied by an increased depletion of media serine (P = 0.006).
6Health effects of insect consumptionSystematic ReviewCited 10×2023
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.
Cunha N et al. · Nutrients (2023)
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.
7Post-exercise rating of perceived exertionMeta-AnalysisCited 33×n=206 · medium study2020
Citrulline supplements significantly reduced post-exercise RPE and muscle soreness without affecting blood lactate levels.
Rhim HC et al. · Journal of sport and health science (2020)
Likely real
Citrulline supplementation significantly reduced RPE (n = 7, p = 0.03) and muscle soreness 24-h and 48-h after post-exercise (n = 7, p = 0.04; n = 6, p = 0.25, respectively).
However, citrulline supplementation did not significantly reduce muscle soreness 72-h post-exercise (n = 4, p = 0.62) or lower blood lactate levels (n = 8, p = 0.17).
8Muscle strength and performance measuresSystematic ReviewCited 27×n=167 · medium study2020
The limited quality of the studies makes firm conclusions difficult, however protein and/or EAA supplementation may improve important outcome measures related to sarcopenia.
Nichols S et al. · European journal of nutrition (2020)
The limited quality of the studies makes firm conclusions difficult, however protein and/or EAA supplementation may improve important outcome measures related to sarcopenia.
High-quality randomised controlled studies are needed.
9Physical function outcomesSystematic ReviewCited 10×2022
Physical function was also influenced by beef and nutrients found in beef.
Hawley AL et al. · Meat science (2022)
Physical function was also influenced by beef and nutrients found in beef.
Eight of the studies found focused on specific nutrients found in beef, and not beef itself in older adults with one or more chronic diseases.
This study identified a need for further research regarding the effect of beef and nutrients found in beef on defined functional outcomes of wellbeing in healthy adults ≥50 years of age.
10Mood and emotional functioning improvementSystematic ReviewCited 44×2021
In order to estimate the optimum amount of TRP intake more accurately, further studies need to be conducted with more appropriate settings of intake period, intake frequency, and intake method.
Kikuchi AM et al. · Journal of dietary supplements (2021)
This suggests that TRP intake may be an effective approach to decrease anxiety and increase positive mood in healthy individuals.
On the other hand, the effectiveness of TRP for aggressive feelings was not recognized.
Reviewing these 11 RCTs, we concluded that taking 0.14-3 g of TRP per day in addition to the usual meal can be expected to improve the mood of healthy individuals.
11Appendiceal/skeletal muscle mass maintenanceSystematic ReviewCited 32×n=16 · very small study2023
This systematic review was registered in PROSPERO, ID: CRD42022344284.
Hernández-Lepe MA et al. · Nutrients (2023)
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.
13Muscle mass improvement with leucineMeta-AnalysisCited 192×n=15 · very small study2021
Best evidence is available to recommend leucine, because it has a significant effect on muscle mass in elderly people with sarcopenia.
Gielen E et al. · Nutrition reviews (2021)
Best evidence is available to recommend leucine, because it has a significant effect on muscle mass in elderly people with sarcopenia.
Protein supplementation on top of resistance training is recommended to increase muscle mass and strength, in particular for obese persons and for ≥ 24 weeks.
Effects on sarcopenia as a construct were not reported in the included reviews.
14Muscle mass and muscle functionSystematic ReviewCited 416×n=17 · very small study2017
Physical exercise has a positive impact on muscle mass and muscle function in healthy subjects aged 60 years and older.
Beaudart C et al. · Osteoporosis international : a journal established as result of cooperation between the European Foundation for Osteoporosis and the National Osteoporosis Foundation of the USA (2017)
In 79% of the studies (27/34 RCTs), muscle mass increased with exercise but an additional effect of nutrition was only found in 8 RCTs (23.5%).
Muscle strength increased in 82.8% of the studies (29/35 RCTs) following exercise intervention, and dietary supplementation showed additional benefits in only a small number of studies (8/35 RCTS, 22.8%).
Finally, the majority of studies showed an increase of physical performance following exercise intervention (26/28 RCTs, 92.8%) but interaction with nutrition supplementation was only found in 14.3% of these studies (4/28 RCTs).
This review examines the interplay between EAAs and CD pathogenesis, highlighting their roles in immune modulation, gut barrier maintenance, systemic metabolic effects, and potential as disease biomarkers.
Bakhtiari S et al. · Critical reviews in clinical laboratory sciences (2026)
EAA imbalances may serve as biomarkers for disease activity, severity, and treatment response.
Altered plasma and fecal amino acid profiles correlate with disease progression, offering diagnostic and monitoring potential.
Addressing EAA deficiencies through targeted supplementation or dietary interventions could enhance intestinal healing, mitigate complications, and improve outcomes beyond a gluten-free diet (GFD).
Kamalakannan M et al. · Journal of the science of food and agriculture (2025)
Moreover, regulatory inconsistencies across global food safety frameworks complicate the commercialization process.
Additionally, evaluating their role in muscle protein synthesis, endurance enhancement, and post-exercise recovery will determine their efficacy as sustainable alternatives in strength- and muscle-building regimens.
This review explores the nutritional composition of edible insects, their environmental benefits, and their potential health risks.
Mukhtiar A et al. · Zeitschrift fur Naturforschung. C, Journal of biosciences (2024)
Future research should focus on optimizing inclusion levels in animal and human diets, elucidating molecular mechanisms of action, and advancing green extraction technologies to enhance its efficacy and sustainability.
This study highlights the multifaceted applications of M. oleifera across diverse sectors and its potential to revolutionize sustainable agriculture, healthcare, and environmental conservation.
Addressing existing challenges through cutting-edge research and technological innovation will unlock its full potential as a key natural resource for enhancing global food security, promoting sustainable development, and pioneering pharmaceutical breakthroughs.
1830-day mortalityRCTCited 8×n=237 · medium study2024
Further studies should investigate the effect of supplementation of methionine in this patient group to improve outcomes.
Wunderle C et al. · Nutrients (2024)
Huge harm
← WorseNo effectBetter →
Likely real
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.
19Behavioral and psychological symptoms of dementia (BPSD)RCTCited 8×n=36 · small study2022
Our results did not show a beneficial effect of the mixture containing nine essential amino acids on BPSD as a primary endpoint; however, it may improve executive function in patients with AD.
Takada M et al. · International journal of geriatric psychiatry (2022)
Our results did not show a beneficial effect of the mixture containing nine essential amino acids on BPSD as a primary endpoint; however, it may improve executive function in patients with AD.
20Whole-body anabolism after resistance exerciseRCTn=12 · very small study2025
Dileucine-supplemented EAA and BCAA support greater whole-body anabolism compared with COL after resistance exercise independent of attenuation in urinary estimates of myofibrillar protein breakdown.
Aguilera JA et al. · Journal of the International Society of Sports Nutrition (2025)
Dileucine-supplemented EAA and BCAA support greater whole-body anabolism compared with COL after resistance exercise independent of attenuation in urinary estimates of myofibrillar protein breakdown.
Exploratory ex vivo experiments reveal a potential anabolic effect of DIEAA in stimulating MPS.
Collectively, these findings suggest that consuming dileucine with sufficient EAA and BCAA increases exogenous leucine retention to support whole-body anabolism during postexercise recovery in individuals performing resistance training.