EAA · EAAs
Essential amino acids (EAAs) are the nine amino acids that humans cannot synthesize and must obtain from diet: leucine, isoleucine, valine (the three branched-chain amino acids - BCAAs), lysine, methionine, phenylalanine, threonine, tryptophan, and histidine. EAAs are the rate-limiting substrates for muscle protein synthesis (MPS), tissue repair, and synthesis of neurotransmitters and other amino acid-derived compounds.
Starting dose. 5-10g — EAA blend
Pre/intra/post-workout for athletic use. Between meals for older adults to maintain MPS triggers throughout day. Fasted training: useful intra-workout to prevent muscle breakdown without breaking fast (minimal calories). Mix in cool water - bitter taste is common.
Start here. Every protocol below is ordered lowest-first. Begin at the smallest effective dose, hold about a week to assess tolerance, and step up only if needed.
Leucine triggers MPS via mTOR/p70S6K activation - the same mechanism as whey but delivered as free leucine without need for proteolytic digestion. ~3g leucine per serving optimally triggers MPS.
All 9 EAAs are required for actual protein synthesis to occur after MPS is triggered - leucine starts the signal, but lysine, methionine, threonine, etc. are needed as building blocks. This is why pure leucine alone is suboptimal vs full EAA blend.
Free amino acid absorption: EAAs in free form bypass gastric digestion and are rapidly absorbed in upper small intestine via amino acid transporters (LAT1, B0AT1, others). Plasma amino acid levels rise within 30-60 minutes (vs 60-90 min for whey, 90-120 min for whole protein).
Nitrogen efficiency: EAA blends have higher nitrogen retention efficiency than mixed proteins because they contain only essential amino acids - no 'wasted' non-essentials. This is particularly relevant in protein-restricted contexts (kidney disease, fasting).
Branched-chain prominence: EAA blends are typically 40-50% BCAAs by mass (with leucine 20-25%, isoleucine and valine ~10% each). The remaining 50-60% are the other 6 EAAs in roughly proportional amounts.
Insulin response: EAAs cause less insulin spike than whey (which contains rapidly absorbed peptides and lactose). Useful for intra-workout where insulin spike isn't desired.
Substrate for neurotransmitters: tryptophan → serotonin, phenylalanine → catecholamines, methionine → SAMe. EAA blends provide these precursors.
Acute: amino acid availability, MPS spike.
Each reference below was re-fetched from its PubMed record, and the quoted sentence was confirmed to appear in that abstract and to support the claim it sits under. Follow any of them to read the source.
Six grams of oral EAAs at 1 and 2 hours after exercise falls within the 5-10 g serving range.
This study tests the hypothesis that a dose of 6 g of orally administered essential amino acids (EAAs) stimulates net muscle protein balance in healthy volunteers when consumed 1 and 2 h after resistance exercise.
Essential amino acids and muscle protein recovery from resistance exercise.
Evidence scope. Healthy volunteers; acute post-exercise drinks, not chronic 1-3x/day use.
EAAs stimulated muscle protein synthesis dose-dependently, without requiring nonessential amino acids.
Because the NB response was double the response to two doses of a mixture of 3 g of EAA + 3 g of nonessential AA (NEAA) (14), we conclude that NEAA are not necessary for stimulation of NB and that there is a dose-dependent effect of EAA ingestion on muscle protein synthesis.
Essential amino acids and muscle protein recovery from resistance exercise.
Evidence scope. Human acute resistance-exercise physiology study.
Claims we could not support
No abstract we checked supports these for this molecule at this route. That is not the same as saying they are false — it marks where the evidence is missing.
Frequency/timing: 1-3x daily, between meals, or fasted training. The abstract supports two post-exercise drinks only.
Primary safety and kidney nitrogen risk. No checked abstract established the card safety profile at this regimen.
Two different questions: what is documented about running these together, and what is documented about drawing them into the same syringe. A good pharmacological partner can still have to be pinned separately.
Check any specific pair in the Stack & Interaction Checker, which answers both questions separately. Absence of a documented conflict is not evidence of safety.
Plasma amino acids peak ~30-60 min, return to baseline ~2-3 hours.
(faster than intact protein).
Most amino acids cleared within 2-3 hours - either incorporated into protein, oxidized for energy, or used for synthesis of other compounds.
For free amino acid blends - bypasses digestion, directly absorbed.
MPS effect: 2-4 hours per dose. Multiple daily doses recommended for sustained MPS support, particularly in older adults.
Standard amino acid metabolism - protein synthesis, oxidation, gluconeogenesis, transamination.
Storage. Store at room temperature (20-25C) in a cool, dry place. Protect from moisture. Powder shelf-stable 1-2 years. Capsules longer.
Classified as a dietary supplement / food product in the US - no prescription required. Specialized medical formulations for PKU, MSUD, and other inborn errors are prescription medical foods.
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