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Label data · how much magnesium per serving

Magnesium: elemental mg per serving on every magnesium label we carry

The number that matters on a magnesium label is elemental magnesium per serving, not the weight of the compound: 'magnesium glycinate 400 mg' can mean ~60 mg of magnesium, while a label that says 'Magnesium (as glycinate) 200 mg' means 200 mg. Forms differ in what they're used for — glycinate and bisglycinate for evenings, citrate for regularity, L-threonate marketed for focus. The table shows the printed amount per serving for every magnesium product we track.

5 labels we read

Lowest
120 mg
Median
200 mg
Highest
400 mg

Magnesium per serving as printed on the Supplement Facts panel of each product below.

What to check on the label

  • 'Magnesium (as …) X mg' on the Supplement Facts line = elemental; 'magnesium glycinate X mg' = compound weight
  • The form: glycinate / bisglycinate / citrate / L-threonate / oxide
  • Serving size — some labels need 2–3 capsules for the printed amount

High doses of some forms (citrate, oxide) loosen stools; people with kidney issues should ask a doctor first.

Magnesium on each label we carry

Sorted by the printed amount. Tap a row to see it on eBay; the product page has the full label.

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  1. Double Wood Supplements Magnesium Glycinate 400 mg

    Double Wood Supplements Magnesium Glycinate 400 mg

    Magnesium glycinate: 400 mg per serving

    Things to consider: The 400 mg on the label is the glycinate compound, not elemental magnesium (about 60 mg per capsule) — don't compare it with elemental doses.

    Magnesium glycinate 400 mgServing 1 capsuleAmazon Full facts →
  2. Natural Vitality CALM Magnesium Citrate Drink Mix, Original

    Natural Vitality CALM Magnesium Citrate Drink Mix, Original

    Magnesium: 350 mg per serving

    Things to consider: Magnesium citrate can have a laxative effect — start with half a dose and build up.

    Magnesium 350 mgForm CitrateAmazon Full facts →
  3. Nature Made High Absorption Magnesium Glycinate

    Nature Made High Absorption Magnesium Glycinate

    Magnesium: 200 mg per serving

    Things to consider: Check with your doctor first if you have kidney disease or take any medication (label advice).

    Magnesium 200 mgForm BisglycinateAmazon Full facts →
  4. Life Extension Neuro-Mag Magnesium L-Threonate

    Life Extension Neuro-Mag Magnesium L-Threonate

    Magnesium: 144 mg per serving

    Things to consider: Magnesium can have a laxative effect at higher doses.

    Magnesium 144 mgFrom 2,000 mg MagteinAmazon Full facts →
  5. Pure Encapsulations Magnesium (Glycinate)

    Pure Encapsulations Magnesium (Glycinate)

    Magnesium: 120 mg per serving

    Magnesium 120 mgForm GlycinateAmazon Full facts →
  6. Doctor's Best High Absorption Magnesium

    Doctor's Best High Absorption Magnesium

    Form GlycinateChelated 100%Amazon Full facts →
  7. Thorne Magnesium Bisglycinate

    Thorne Magnesium Bisglycinate

    Form BisglycinateFormat PowderAmazon Full facts →

Go deeper

Questions people ask

Magnesium glycinate vs citrate — which is better?

Glycinate (also sold as bisglycinate) is the gentle evening form; citrate is well absorbed but more laxative. Both are compared head-to-head on our comparison page.

How much elemental magnesium is in magnesium glycinate 400 mg?

Glycinate is about 14% magnesium by weight, so a label listing 400 mg of the compound delivers roughly 56–60 mg of magnesium. Labels that print 'Magnesium 200 mg (as glycinate)' are already elemental — the Supplement Facts panel is the one to read.

Part of the open label dataset (CC BY 4.0) · how we read labels · other ingredients: Creatine monohydrate · Whey protein · Plant protein · Collagen peptides · Melatonin · Ashwagandha · Vitamin D3 · Omega-3 (EPA + DHA)