Magnesium Citrate Powder for Muscle, Electrolyte and Bone Health Supplement Formulas

Magnesium citrate is the magnesium salt of citric acid, used in dietary supplements for muscle, electrolyte, nervous-system and bone health support. Purecium supplies the commercial nonahydrate form, magnesium citrate nonahydrate, CAS 153531-96-5, molecular formula C12H28Mg3O23 (Mg3(C6H5O7)2·9H2O), molecular weight 613.25 g/mol, with approximately 12% elemental magnesium. Typical servings supply 100 mg to 400 mg elemental magnesium per day.

Magnesium citrate exists as hydrates with different crystal water content. The nonahydrate form, Mg3(C6H5O7)2·9H2O, is a stable commercial grade covered by the European Pharmacopoeia monograph for magnesium citrate nonahydrate, while anhydrous magnesium citrate contains no crystal water and carries a different CAS number and higher elemental magnesium content per gram. Buyers must confirm the hydrate form on the specification, because it determines the elemental magnesium assay and the required label calculation.

Magnesium citrate nonahydrate provides approximately 12% elemental magnesium by weight, calculated from the molecular formula Mg3(C6H5O7)2·9H2O with molecular weight 613.25 g/mol. This means that to supply 200 mg of elemental magnesium a formulator needs approximately 1.7 g of the salt. The exact assay is reported on each batch Certificate of Analysis.

Magnesium citrate dissociates readily and is highly water soluble, and published research indicates good absorption of the citrate salt compared with less soluble inorganic forms such as magnesium oxide. The NIH Office of Dietary Supplements discusses magnesium absorption and the role of the mineral in normal muscle and nerve function, energy metabolism and bone health; EFSA has authorized health claims for magnesium covering these functions.

It means each batch is standardized so that elemental magnesium represents approximately 12% of the salt's weight, confirmed by assay against the European Pharmacopoeia monograph for magnesium citrate nonahydrate. This gives formulators a consistent basis for label declarations: a 500 mg serving of the salt supplies roughly 60 mg of elemental magnesium.

Because of its high water solubility, magnesium citrate is the preferred magnesium form for effervescent tablets, drink powders, stick-packs and liquid supplements. It is also used in conventional tablets and capsules for bone health, muscle support and sleep-adjacent formulas. The mildly acidic taste of the citrate is typically balanced with flavors in drink formats.

Magnesium citrate has a long history of use in foods and food supplements, and the European Pharmacopoeia includes a monograph for magnesium citrate nonahydrate. The NIH Office of Dietary Supplements recognizes magnesium's physiological roles, and EFSA has authorized health claims for the mineral in the EU. As with any mineral, formulators should follow market-specific guidance on dosage and claim wording.

Magnesium oxide is a dense inorganic salt with a much higher elemental magnesium content of about 60%, but it is poorly water soluble and less efficiently absorbed. Magnesium citrate has lower elemental content of approximately 12% but dissolves readily and is considered more bioavailable. The choice depends on the format: oxide suits low-cost dense tablets, while citrate suits effervescent, powder, liquid and high-bioavailability products.

Yes. Common pairings are vitamin D3 and calcium for bone health blends, potassium for electrolyte formulas, and taurine or glycine-containing compounds for muscle support products. Because magnesium citrate is highly soluble, it blends cleanly into effervescent and drink formats. Formulators should verify ingredient compatibility and calculate total elemental magnesium across the formula.

Yes. Purecium's magnesium citrate is produced synthetically from food-grade citric acid and a food-grade magnesium source with no animal-derived materials, carriers or processing aids. It carries clear vegan, non-GMO, allergen-free and gluten-free statements and is suitable for vegan and vegetarian formulations.

Identity is confirmed by chemical testing against the European Pharmacopoeia monograph for magnesium citrate nonahydrate, including magnesium identification and citrate identification reactions. Elemental magnesium is quantified by titration or atomic absorption/ICP methods, and each batch is tested for heavy metals, sulfated ash and microbial limits, all reported on the Certificate of Analysis.

Request a current specification sheet, a batch-specific Certificate of Analysis showing identification, elemental magnesium assay, heavy metals and microbial results, an SDS, allergen and gluten statements, and non-GMO declarations. Also request Kosher and Halal certificates, ISO 9001 and FSSC 22000 certificates, and stability data for registration.

The minimum order quantity is 25 kg. The salt is packed in 25 kg drums with food-grade polyethylene inner bags, and samples and technical documentation are available before you commit. Standard production lead time is typically 7 to 15 working days after order confirmation, with faster dispatch for stocked items. For North American customers, Purecium holds inventory at its US warehouse, enabling pickup or delivery within approximately two days.

Store in tightly sealed original containers in a cool, dry place below 25 degrees Celsius, protected from moisture. Magnesium citrate nonahydrate is hygroscopic and should be kept in its sealed inner bag until use. Shelf life is generally 36 months from the date of manufacture. Each shipment's CoA states the production date and expiry date for inventory planning.

Purecium supplies magnesium citrate in the EP-grade nonahydrate form with every batch released on a full Certificate of Analysis including identification, elemental magnesium assay, heavy metal and microbial results, an SDS and supporting documentation. Production follows ISO 9001 and FSSC 22000 certified systems with Kosher and Halal certification available. The minimum order is 25 kg, inventory is staged at our US warehouse for fast fulfillment, and global delivery covers Hong Kong, mainland China, the EU and beyond. For long-term supply relationships, Purecium provides consistent quality, batch traceability, regulatory documents and direct technical communication.