Magnesium Glycinate vs Citrate vs Malate: Which One Should You Take?
Three magnesium forms, three different jobs. Sleep, muscle cramps, energy — here's how to pick the right one without overpaying.
The Quick Answer
| Form | Best for | Notes |
|---|---|---|
| Glycinate | Sleep, anxiety, muscle relaxation | Highly absorbable, gentle on stomach |
| Citrate | Constipation, general supplementation | Can cause loose stools at higher doses |
| Malate | Energy, fibromyalgia, fatigue | Pairs magnesium with malic acid for ATP support |
| Oxide | Cheap label fluff | Poorly absorbed — about 4% bioavailability |
| L-Threonate | Cognition, brain fog | Crosses the blood-brain barrier; premium price |
The form matters more than the dose. 200 mg of glycinate beats 800 mg of oxide for sleep and muscle relaxation every time.
Why Magnesium Form Matters
Elemental magnesium can't enter cells on its own — it has to be bound to another molecule. That carrier molecule determines two things: how well it's absorbed and what it does inside the body.
Glycinate = magnesium bound to glycine (a calming amino acid). The glycine itself improves sleep, so you get a double effect.
Citrate = bound to citric acid. Cheap, well-absorbed, but draws water into the bowel — which is why it's the form in laxatives.
Malate = bound to malic acid, which is a key player in the cell's energy cycle. Popular with people who deal with fatigue or fibromyalgia.
Oxide = magnesium and oxygen. The cheapest form. The form most generic supplements use because it's high-percentage by weight. But only ~4% is absorbed.
L-Threonate = bound to threonic acid, the only form that meaningfully crosses the blood-brain barrier. Used in the few real cognitive studies on magnesium.
How Much You Need
The RDA is 400 mg for men, 310 mg for women. Realistic supplementation:
How 2THIRTY Handles Magnesium
Each 2THIRTY serving includes 50 mg of magnesium as citrate — enough to support hydration and recovery without pushing into laxative territory. For sleep, we recommend adding 200 mg of dedicated glycinate at night.
Frequently Asked Questions
Can I take magnesium and electrolytes together?
Yes. Magnesium is itself an electrolyte. Most quality hydration products include 30-100 mg per serving. You can pair them with a dedicated magnesium glycinate at night without overdoing it.
How much magnesium is too much?
From food, there's basically no upper limit. From supplements, the Tolerable Upper Intake Level is 350 mg per day. Higher doses are common in clinical use but should be discussed with a doctor — the main risk is diarrhea, not toxicity.
Is magnesium oxide a scam?
Not a scam, but a poor value. Its 4% bioavailability means a 500 mg pill delivers about 20 mg of usable magnesium. For the same money you can get 200 mg of glycinate, which is roughly 8x more effective.
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