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    Ingredient guide · Ingredient reference

    Magnesium glycinate is not a fat-soluble vitamin

    The fat-soluble vitamin category does not describe magnesium glycinate. Its mineral content, chemical form and intestinal absorption are separate issues.

    Read the evidence ↓

    Supplement Science Insights Editorial Team

    Published September 23, 2026

    Separate a vitamin category from a mineral compound

    MedlinePlus identifies A, D, E and K as the fat-soluble vitamins. Magnesium is a mineral. Glycinate refers to a glycine-derived chemical form; the word does not turn magnesium into one of those vitamins. Describing a supplement as fat-soluble is therefore not an appropriate shortcut for explaining its magnesium delivery. [1][2][3]

    Absorption is a different question

    ODS describes intestinal magnesium absorption and differences among supplemental forms. A chemical name alone does not establish a particular person’s absorbed percentage, superiority to every other form or an obligation to take it with a fatty meal. The declared elemental magnesium amount is also different from the mass of the complete compound. [1]

    A hypothetical label distinction

    If a label declares magnesium 100 mg from a glycinate source, record 100 mg as the nutrient amount for that serving. Do not count an additional front-label compound weight as a second amount of magnesium. Follow the exact product and clinical instructions rather than applying advice written for fat-soluble vitamin D to a mineral. [1]

    Hypothetical example — interpret a specific hypothetical label or comparison
    TermMeaning
    Fat-soluble vitaminsA,D,E,K
    MagnesiumMineral nutrient
    GlycinateA glycine-derived chemical form
    Magnesium glycinate is not a fat-soluble vitamin — original article outline diagram
    Original editorial diagram of this article’s sections; no product photograph or clinical finding is depicted.

    Sources for this article

    1. Magnesium - Health Professional Fact Sheet
      Source consulted: 2026-09-20. This is a reference resource, not a claim that we conducted the studies or tested a product.
    2. glycinate (CHEBI:32508)
      Source consulted: 2026-09-20. This is a reference resource, not a claim that we conducted the studies or tested a product.
    3. Vitamins: MedlinePlus Medical Encyclopedia
      Source consulted: 2026-09-20. This is a reference resource, not a claim that we conducted the studies or tested a product.