Educational dose math only — not medical advice, not bioavailability modeling, and not a pass/fail on whether a form works for you.
Elemental magnesium
56.4mg
Elemental estimate
Formula
elemental = compound × 14.1%
Daily value reference
Magnesium form
Label dose
400 mg glycinate × 14.1% ≈ 56.4 mg elemental magnesium ≈ 18% of the 320 mg daily value (women). Approximate by mass only — not a measure of how much you absorb.
Example: 400 mg glycinate → ~56.4 mg elemental
Educational only — not medical advice. Disclaimer.
How to use this
- Form — pick the salt on the Supplement Facts panel (glycinate, citrate, oxide, …).
- Compound mg — the milligrams of that magnesium compound for the serving, if the label lists compound weight instead of elemental.
- If the label already says “elemental magnesium” — you do not need this conversion; use that number.
- Oxide — high elemental % by mass, typically poor absorption. Do not treat the converted number as “what you get.”
Evidence context
Human bioavailability work consistently finds citrate and amino-acid chelates outperform oxide on absorption markers. The calculator only does mass percent — the form still decides GI effect, tolerance, and whether the dose is useful for repletion versus a label contest.