Important limitations
- Individual claims and source links have not yet completed editorial verification.
- Evidence level, applicable study model, formulation, route and population remain unassigned.
EAA
EAA is a complete blend of nine essential amino acids, the fundamental building blocks required for protein synthesis, tissue repair, and metabolic regulation.
Reported protocols for EAA
What published studies and recent community write-ups report about amounts, timing and course length. 5 clinical and 1 community-reported rows, each linked to its source. These are descriptions of what others report, not instructions, and nothing here is medical advice.
| Context | Dose | Frequency | Route | Course | Source |
|---|---|---|---|---|---|
| Clinical5 rows | |||||
| ISSN position stand on essential amino acid supplementationHealthy, athletic, ageing and clinical adult populations in the oral EAA literature | 1.5-3 g stimulates muscle protein synthesis at rest; the response plateaus at about 15-18 g | Single doses, repeated through the day in several studies | Oral free-form amino acids | Acute studies and multi-week trialsNot applicable | Journal of the International Society of Sports Nutrition (PubMed)2023 |
| The 2023 position stand concludes that free-form EAAs stimulate muscle protein synthesis more than the same amount of intact protein, that non-essential amino acids are not needed for the effect, that repeated EAA doses do not blunt the response to meals, and that older adults need a higher leucine share. It also states that EAA requirements rise during a caloric deficit, which is the context in which the injectable blend is marketed. | |||||
| EAA plus arginine in glucose-intolerant older adults12 glucose-intolerant adults, mean age 67 (7 women, 5 men) | 11 g EAA plus arginine | Twice daily, between meals | Oral | 16 weeksNone | Clinical Nutrition (PubMed)2008 |
| Lean body mass rose by 1.14 kg at week 12 and 0.60 kg at week 16, leg strength rose about 22%, and gait speed and transfer tests improved, all against baseline. There was no placebo group, so the authors compared participants with themselves. | |||||
| EAA plus carbohydrate during 28 days of bed rest13 healthy men aged 26-46 confined to bed for 28 days | 16.5 g EAA with 30 g carbohydrate | Three times a day (11:00, 16:00 and 21:00), between regular meals | Oral | 28 daysNone | Journal of Clinical Endocrinology and Metabolism (PubMed)2004 |
| Lean leg mass was maintained (+0.2 kg) in the supplemented group but fell 0.4 kg in controls, muscle protein synthesis stayed higher on day 28, and strength loss was roughly half that of controls (8.8 versus 17.8 kg). The supplement did not prevent strength loss entirely, and the participants were young men rather than the older adults the authors hoped to help. | |||||
| EAA during 10 days of bed rest in older adults22 older adults (mean age about 70) randomised to EAA (10) or placebo (12) during 10 days of bed rest | 15 g EAA | Three times a day | Oral | 10 daysNone | Clinical Nutrition (Scholars@Duke record)2010 |
| The analyses suggested that functional outcomes were preserved with EAA supplementation, and the authors proposed EAA as a way to raise protein intake above the RDA without affecting satiety. Groups were unbalanced by sex at randomisation and the trial was small, so the result is described as potential rather than proof. | |||||
| Leucine-enriched EAA gel after resistance exerciseHealthy younger (about 28 years) and older (about 71 years) men in a proof-of-concept crossover study | 15 g EAA (two 50 mL gels, about 6 g leucine, 40% of the dose) | Single dose after a resistance exercise bout | Oral gel | Single session with biopsies 2 hours after exerciseNot applicable | Nutrients (Leeds Beckett University repository)2020 |
| The two gels, described as equivalent to the EAA content of about 30 g of quality protein, produced peak blood leucine roughly 60-120 minutes after ingestion and an about eightfold rise in rpS6 phosphorylation at two hours in both age groups. It is an acute mechanistic study of an oral product and says nothing about repeated use. | |||||
| Community-reported1 row | |||||
| Community breakdown of a vendor EAA liquid | 0.5 mL (about 91 mg of amino acids at the listed 182 mg/mL) | One to two times a day, starting low and building up | Subcutaneous | Not specifiedNone described | Community resource2026 |
| A February 2026 Substack post lists the nine amino acids per millilitre, describes 0.5 mL subcutaneously once or twice a day as the typical research range, and says the product is stored at room temperature and needs no reconstitution. The author's own position is that the blend is unnecessary for anyone who trains and meets protein targets, and that it was something he used only when protein goals could not be met by food. | |||||
How a course is commonly described
- First days: start lowCommunity-reported
The community breakdown describes beginning at 0.5 mL subcutaneously once a day and building toward twice daily, mainly to judge injection-site tolerance of a concentrated amino solution. No systemic effect is described at this stage.
- Weeks 1-4: trial courses of this lengthClinical
The bed rest trials ran 10 and 28 days of oral EAA at 15-16.5 g three times a day and reported preserved lean mass or function within that window. These used 45-50 g of EAA per day, several hundred times a 0.5 mL injection of the blend.
- Weeks 12-16: longest supplementation courseClinical
In the 16-week older-adult study, lean mass gain peaked at week 12 (+1.14 kg) and had faded to +0.60 kg by week 16 even though supplementation continued, while strength and function gains persisted. The authors did not explain the week-16 fall-off.
- All human EAA evidence is oral, at 1.5-3 g for a measurable protein-synthesis response and 11-18 g per dose in the trials that changed lean mass. A 1 mL injection of this blend carries roughly 0.2 g of amino acids, so the trial findings describe a different dose range and route.
- The legacy page for this product gave 1-2 mL daily after training and a laboratory framing of 0.5-1.0 mL per session, 3-5 sessions a week for 2-4 weeks. No published study has examined subcutaneous or intramuscular EAA at any dose.
- Injectable amino acids with regulatory approval exist only as intravenous parenteral nutrition solutions compounded in hospital pharmacies; the research-vendor liquid is not FDA-evaluated and its sterility and stability rest on the vendor's own testing.
Sources for this section (9)
- International Society of Sports Nutrition Position Stand: Effects of essential amino acid supplementation on exercise and performance
- Effect of amino acid supplementation on muscle mass, strength and physical function in elderly
- Essential amino acid and carbohydrate supplementation ameliorates muscle protein loss in humans during 28 days bedrest
- EAA supplementation to increase nitrogen intake improves muscle function during bed rest in the elderly
- Novel Essential Amino Acid Supplements Following Resistance Exercise Induce Aminoacidemia and Enhance Anabolic Signaling Irrespective of Age: A Proof-of-Concept Trial
- TROPHAMINE (10% Amino Acid Injection): Prescribing Information
Plus 3 community resources (dosing guides, forum threads and vendor write-ups), reported above but not linked.
Overview
EAA is a ready-to-use injectable blend of all nine essential amino acids (valine, isoleucine, leucine, methionine, phenylalanine, tryptophan, threonine, histidine and lysine) sold by research vendors. This calculator lists it at 215 mg/mL in a 10 mL vial; a 2026 community breakdown of one vendor EAA gives 182 mg/mL in a 20 mL vial (histidine 45, threonine 35, lysine 35, methionine 25, phenylalanine 20, leucine 10, valine 5, isoleucine 5 and tryptophan 2 mg/mL), and because the legacy page for this product stated no breakdown the per-ingredient amounts are left blank here. Free-form essential amino acids have a substantial oral literature: a few grams stimulate muscle protein synthesis, 11-16.5 g doses taken two or three times a day preserved lean mass in older adults and during bed rest, and the International Society of Sports Nutrition issued a position stand in 2023. The only approved injectable amino acid products are intravenous parenteral nutrition solutions such as 10% amino acid injections, which contain all nine essential amino acids plus non-essential ones in gram quantities; a sub-gram subcutaneous blend has never been studied.
What researchers are exploring
These themes organize the educational information currently available. Individual claims remain under source review and are not treatment claims.
- 1
Research
THIS PRODUCT IS INTENDED AS A RESEARCH CHEMICAL ONLY AND IS NOT APPROVED FOR HUMAN USE Human and animal studies have shown that EAA supplementation enhances muscle recovery and helps prevent age-related muscle loss…
What is known and what still needs verification
Available context is organized without assigning unsupported study models or evidence grades.
- Not graded
Research
THIS PRODUCT IS INTENDED AS A RESEARCH CHEMICAL ONLY AND IS NOT APPROVED FOR HUMAN USE Human and animal studies have shown that EAA supplementation enhances muscle recovery and helps prevent age-related muscle loss (sarcopenia).…
Limitations and unknowns
Sources
1 link carried over from the earlier page, awaiting verification.