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Essential amino acids

Essential amino acids suppliers and sourcing guide

Essential amino acid (EAA) blends combine the nine amino acids the body cannot make: histidine, isoleucine, leucine, lysine, methionine, phenylalanine, threonine, tryptophan and valine. Each is made separately, mostly by bacterial fermentation, then the free crystalline amino acids are weighed and blended to a set ratio. Brands buy ready-made blends, often instantized and sometimes flavored, or buy the single amino acids and blend them in house.

See suppliersWhat to ask for on the COA
Also known as
EAA blend · EAAs · Essential amino acid blend
Facts checked
November 2026

Forms and grades of essential amino acids

Suppliers sell different products under the same name. Specify the one you need.

  • Unflavored blend

    A dry mix of the nine free amino acids at the supplier's or the buyer's ratio, for capsules and powders.

  • Instantized blend

    Blends in which the poorly wetting amino acids (mainly leucine) are lecithin-coated so the mix disperses in water; check the lecithin source for allergen labeling.

  • Custom-ratio premix

    Blends made to the buyer's own ratio by an amino acid supplier or blender, with a certificate stating each amino acid.

  • Fermented (plant-sugar) grade

    Blends made only from fermentation-derived amino acids, offered with vegan statements; keratin-derived amino acids are excluded.

What to check on the COA

Compare each result with your own specification when the lot arrives.

Amino acid profile
Each of the nine amino acids by HPLC or amino acid analyzer, reported against the label ratio; this confirms the blend was made as specified.
Blend uniformity
Assay results from several points in the batch, which show the amino acids were evenly mixed.
Loss on drying
Moisture by loss on drying; high moisture leads to caking.
Heavy metals
Lead, arsenic, cadmium and mercury by ICP-MS.
Microbiology
Total plate count, yeast and mold, E. coli and Salmonella.
Dispersibility (instantized blends)
Time to wet and disperse in water, plus lecithin content.

Storage, lots and expiry

Storage and shelf life

Store EAA blends in tightly closed, lined containers in a cool, dry place away from light and strong odors; the methionine in them carries a sulfur note that can build in sealed packs. Reseal opened packs promptly to stop caking. Shelf life or retest date is set by the supplier's specification; amino acid profile, moisture and micro are the usual retest points.

Lots and expiry dates

Record the amino acid profile for each lot and compare it to the label ratio, and keep the certificates for the single amino acids if you blend in house. Rotate stock FEFO.

Regulatory status

Facts from regulators and standards bodies, each linked to its source.

  • 21 CFR 172.320 lists L-histidine, L-isoleucine, L-leucine, L-lysine, L-methionine, L-phenylalanine, L-threonine, L-tryptophan and L-valine among the amino acids that may be safely used as nutrients added to foods.

    Source: ecfr.gov (opens in a new tab)

  • For amino acids used under 21 CFR 172.320, the label of the additive and any premix must state the amount of each amino acid in a mixture.

    Source: ecfr.gov (opens in a new tab)

  • Health Canada's Workout Supplements monograph groups histidine, isoleucine, leucine, lysine, methionine, phenylalanine, threonine, tryptophan and valine as essential amino acids, each with its own daily dose range.

    Source: webprod.hc-sc.gc.ca (opens in a new tab)

This is general information, not regulatory advice. Status differs by country and by how the ingredient is used, so check the rules for your product and market.

Essential amino acids suppliers

Manufacturers and distributors whose own websites say they sell it.

We are checking essential amino acids suppliers now

Every listing is checked against the supplier’s own website before it goes live, so this list fills in over the coming weeks. The specs and COA checklist above are ready today.

Sell essential amino acids? Request a listing

Frequently asked questions

What forms of essential amino acids can brands buy?

Common forms include unflavored blend, instantized blend, custom-ratio premix and fermented (plant-sugar) grade. Ask each supplier for the specification sheet of the exact grade they quote.

What should the COA for essential amino acids include?

Expect amino acid profile, blend uniformity, loss on drying, heavy metals, microbiology and dispersibility (instantized blends), each with its method, specification and result for that lot.

How should essential amino acids be stored?

Store EAA blends in tightly closed, lined containers in a cool, dry place away from light and strong odors; the methionine in them carries a sulfur note that can build in sealed packs. Reseal opened packs promptly to stop caking. Shelf life or retest date is set by the supplier's specification; amino acid profile, moisture and micro are the usual retest points.

What is the regulatory status of essential amino acids?

21 CFR 172.320 lists L-histidine, L-isoleucine, L-leucine, L-lysine, L-methionine, L-phenylalanine, L-threonine, L-tryptophan and L-valine among the amino acids that may be safely used as nutrients added to foods. For amino acids used under 21 CFR 172.320, the label of the additive and any premix must state the amount of each amino acid in a mixture. Health Canada's Workout Supplements monograph groups histidine, isoleucine, leucine, lysine, methionine, phenylalanine, threonine, tryptophan and valine as essential amino acids, each with its own daily dose range.

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