Essential Amino Acid (EAA) Blend
Also known as: EAA, EAAs, essential amino acids, free-form EAA
A free-form blend of all nine essential amino acids, typically leucine-weighted, that provides the complete substrate for muscle protein synthesis without the bulk of a full protein serving. Small EAA doses stimulate muscle protein synthesis roughly as well as much larger whole-protein doses, which makes EAAs useful in intra-workout, low-calorie, and older-adult formulas. Quality is determined by total EAA content and leucine share.
Research summary
Supplies all essential amino acids required for muscle protein synthesis, with leucine as the signaling trigger.
Dosage
Daily amounts, of compound.
| Lowest studied | Typical range | Highest studied | Upper limit |
|---|---|---|---|
| 6 g | 6–15 g | 15 g | — |
Research has used 6–15 g of free EAAs per serving, with leucine making up about 35–40% of the blend. A 10 g serving with 3.5–4 g leucine matches the anabolic effect of a 25–30 g whey serving. Many commercial blends are diluted with non-essential amino acids, so specify the EAA fraction when sourcing.
Standardization: Specify leucine share (commonly 35–40% of EAA mass)
Source material: fermentation-derived amino acids
Format suitability
- Capsule
- Powder
- Tablet
- Softgel
- Gummy
- Liquid
Gram-scale dose; powder is standard. Methionine, tryptophan, and the BCAAs make the blend bitter and sulfurous, so instantized grades and strong flavoring are needed.
Formulation notes
Replaces or supersedes a separate BCAA dose in the same formula. Pairs with electrolytes in intra-workout mixes and with creatine in muscle-support stacks.
Sources
Related ingredients
Creatine Monohydrate
Sports performanceThe most researched sports supplement in existence.
Typical: 3–5 g
HMB (Beta-Hydroxy Beta-Methylbutyrate)
Sports performanceA metabolite of leucine studied for reducing exercise-induced muscle protein breakdown and supporting strength and lean mass, particularly in untrained people, older adults, and during intense training blocks.
Typical: 3 g
L-Leucine
Amino acidThe branched-chain amino acid that most directly triggers muscle protein synthesis through mTOR signaling.
Typical: 2.5–5 g
Whey Protein Isolate
ProteinWhey filtered to 90% or more protein by weight, with most lactose and fat removed.
Typical: 20–30 g
Whey Protein Concentrate
ProteinWhey concentrated by ultrafiltration to 70–80% protein, retaining more lactose, fat, and native bioactive fractions than isolate.
Typical: 25–35 g