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    Ingredient guide · Ingredient reference

    Magnesium in cocoa powder: a tablespoon is not 100 grams

    Unsweetened cocoa is concentrated, but typical recipe portions are small. Use the powder amount, preparation and product identity when estimating magnesium.

    Read the evidence ↓

    Supplement Science Insights Editorial Team

    Published September 23, 2026

    Start with the powder description

    USDA SR Legacy 2018 lists unsweetened cocoa powder at 499.0 mg magnesium per 100 g. The unsweetened powder processed with alkali entry has 476.0 mg per 100 g. These are reference descriptions, not a controlled test proving the effect of alkalization or current values for every brand. [1]

    Convert to the amount in the recipe

    Both entries use 5.4 g for a reference tablespoon. That gives about 26.9 mg magnesium for ordinary unsweetened powder and 25.7 mg for the alkali-processed record. A sweetened hot-cocoa mix contains other ingredients and needs its own composition. The magnesium in a finished drink also depends on the liquid and other additions. [1]

    A hypothetical recipe portion

    A recipe using 10 g unsweetened cocoa contributes an estimated 49.9 mg magnesium from the powder. Split equally into two portions, that is about 24.9 mg each. This is recipe arithmetic; a high per-100-g concentration does not mean that a small spoonful contains the full 499 mg. [1]

    Hypothetical example — divide cocoa in a two-portion recipe
    Powder allocationEstimated magnesium
    10 g total unsweetened powder49.9 mg
    5 g in each equal portion24.9 mg
    Magnesium in cocoa powder: a tablespoon is not 100 grams — 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. USDA FoodData Central — SR Legacy April 2018 food composition dataset
      Source consulted: 2026-09-20. This is a reference resource, not a claim that we conducted the studies or tested a product.