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Magnesium aspartate

Magnesium aspartate suppliers and sourcing guide

Magnesium aspartate is the magnesium salt of the amino acid L-aspartic acid. It is made by reacting aspartic acid with magnesium oxide, hydroxide or carbonate in water and drying the product, which is sold as the dihydrate, tetrahydrate or a hydrochloride form. It is a white, water-soluble powder with a fairly low magnesium content, so brands use it in capsules, powders and drink mixes rather than high-dose tablets.

See suppliersWhat to ask for on the COA
Also known as
Magnesium L-aspartate · Magnesium aspartate dihydrate · Magnesium aspartate tetrahydrate
Facts checked
November 2026

Forms and grades of magnesium aspartate

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

  • Dihydrate

    A common pharmaceutical and supplement grade with magnesium stated on the specification.

  • Tetrahydrate

    A more hydrated form with less magnesium per gram.

  • Magnesium aspartate hydrochloride

    A mixed salt with chloride, offered as a separate grade with its own specification.

What to check on the COA

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

Magnesium assay
Magnesium by complexometric titration or ICP-OES.
Aspartic acid content and identity
Aspartic acid by HPLC or titration, plus IR identity.
Loss on drying
Confirms the hydrate form.
Chloride and sulfate
Limit tests for process impurities.
Heavy metals and microbiology
Lead, arsenic, cadmium and mercury by ICP-MS, plus total plate count, yeast and mold.

Storage, lots and expiry

Storage and shelf life

Store magnesium aspartate in tightly closed containers in a cool, dry place; it is hygroscopic and cakes if left open. Reseal packs promptly. Shelf life is set by the supplier's specification, with assay and moisture the usual retest checks.

Lots and expiry dates

Record the hydrate form and magnesium assay for each lot, since they set the elemental magnesium dose. Keep the hydrochloride form on a separate item code.

Regulatory status

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

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.

Magnesium aspartate suppliers

Manufacturers and distributors whose own websites say they sell it.

We are checking magnesium aspartate 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.

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Frequently asked questions

What forms of magnesium aspartate can brands buy?

Common forms include dihydrate, tetrahydrate and magnesium aspartate hydrochloride. Ask each supplier for the specification sheet of the exact grade they quote.

What should the COA for magnesium aspartate include?

Expect magnesium assay, aspartic acid content and identity, loss on drying, chloride and sulfate and heavy metals and microbiology, each with its method, specification and result for that lot.

How should magnesium aspartate be stored?

Store magnesium aspartate in tightly closed containers in a cool, dry place; it is hygroscopic and cakes if left open. Reseal packs promptly. Shelf life is set by the supplier's specification, with assay and moisture the usual retest checks.

What is the regulatory status of magnesium aspartate?

Health Canada's Multi-Vitamin/Mineral Supplements monograph for natural health products lists magnesium aspartate and its hydrates among the source ingredients for magnesium (Table 2). 21 CFR 101.9(c)(8)(iv) sets the Reference Daily Intake for magnesium at 420 mg for adults and children 4 years and older.

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