Magnesium is one of the most purchased mineral supplements, and glycinate and citrate are two of the most common forms on the shelf. They are not the same, and the difference matters for formulation, tolerability, and labeling.
Bioavailability and tolerance
Magnesium glycinate (magnesium bound to glycine) is generally associated with good tolerability, which makes it popular for daily wellness formulas. Magnesium citrate is well absorbed and has a long track record, but at higher doses some users find it has a stronger laxative effect.
Elemental magnesium content
Labels should state elemental magnesium, not the weight of the full salt. The same 200 mg "magnesium" claim can mean very different amounts of actual magnesium depending on the form. Buyers should specify the target elemental amount and confirm it on the assay.
Form and flow
Both forms are available as powders and are compatible with tablets, capsules, and some gummy systems. Powder flow, taste, and hygroscopicity differ, so pilot your format before committing to a production run.
Questions to ask your supplier
- Elemental magnesium percentage and test method
- Heavy metals, especially lead, per your market's limits
- Particle size and flow properties for your dosage form
- Stability and recommended storage
Building a magnesium product? Share your format and we will recommend a grade and specification.
