Magnesium Hydroxide Purity: ≥ 98% (on dry basis) Suppliers & Bulk Manufacturers

Available Forms: White, odorless powder

Available Strengths: Purity: ≥ 98% (on dry basis)

Reference Brands:

Category: Active Pharmaceutical Ingredient

Pharmacopoeial-grade magnesium hydroxide powder, at least 98% pure on dried basis, used as an API in antacid and laxative products. Intended for formulators, contract manufacturers and API distributors.

Product Description:

Magnesium hydroxide, Mg(OH)2, is an inorganic base supplied here as a white, odourless powder of at least 98% purity on the dried basis. It is practically insoluble in water and dissolves in dilute acids. This page is for the raw material, not a finished medicine. Formulators use it as the active ingredient in antacid suspensions and chewable tablets, in osmotic laxatives such as milk of magnesia, and in combination antacids with aluminium hydroxide.

For medicines the material should meet a pharmacopoeial monograph, normally Ph. Eur., BP or USP, covering assay, loss on ignition, soluble substances, carbonate, calcium and iron. Elemental impurities are assessed against ICH Q3D. Particle size and bulk density matter: fine, even particles give smooth, stable suspensions, while denser grades compress better into tablets. The powder slowly absorbs carbon dioxide from air, so reseal containers promptly. Industrial grades made for flame retardants and water treatment are not suitable for medicines.

Sourcing notes. Specify pharmacopoeial grade in writing and ask which monograph and edition the supplier certifies against. Request a CoA for every batch with assay, impurity and microbial results, the GMP certificate for API manufacture to ICH Q7, and a DMF or CEP where one exists. Ask for a TSE/BSE statement and residual solvent declaration. Medical-device marks such as CE do not apply to an API, so treat such a claim as a warning sign. Packing is usually double polyethylene liners in fibre drums or bags. State quantity, particle size and intended use.