Best Magnesium: How to Choose the Right Form for Your Needs
Reference guide to magnesium forms, absorption and daily need.
The best magnesium depends on what you want from it. Organic forms such as glycinate, citrate and malate are absorbed better than inorganic magnesium oxide. Glycinate is gentle on the stomach and suits the evening. Citrate suits a sluggish gut. Oxide is cheap but poorly absorbed.
Quick facts
- Gentlest on the stomach: Magnesium glycinate, bound to the amino acid glycine, rarely causes stomach upset.
- Lowest absorption: Magnesium oxide is absorbed at roughly 4 percent in a classic absorption study.
- Adequate intake: 300 mg of magnesium per day for women and 350 mg for men, according to the Swedish Food Agency.
- Upper limit from supplements: 250 mg per day, because more can cause diarrhoea.
- Label rule: Compare mg of magnesium per dose, not the weight of the whole compound.
The main magnesium forms compared
Supplement magnesium is always bound to a carrier, which sets absorption and stomach feel.
| Form | Absorption | Stomach feel | Fits |
|---|---|---|---|
| Glycinate (bisglycinate) | Good, organic form | Gentle | Evening, sensitive stomach |
| Citrate | Good, organic form | Can loosen stools at high doses | Sluggish gut, general top-up |
| Malate | Good, organic form | Usually gentle | Daytime, active days |
| Taurate | Good, organic form | Usually gentle | Bound to the amino acid taurine |
| Oxide | Low, around 4 percent | Often loosens stools | Cheap tablet, not a first choice |
Which magnesium is absorbed best?
Organic magnesium salts are absorbed better than inorganic ones. Citrate, glycinate and malate dissolve better in the gut than oxide, which carries a lot of magnesium per tablet but was absorbed at about 4 percent in a classic study. Figures for the organic forms vary between studies. The full comparison is in the guide magnesium glycinate vs oxide.
Which magnesium is gentlest on the stomach?
Magnesium glycinate is usually the gentlest on the stomach. Unabsorbed magnesium draws water into the gut, which loosens stools, so oxide and high-dose citrate cause the most trouble. Splitting the dose and taking it with food helps.
Which form fits which need?
- Evening and a sensitive stomach: glycinate. For sleep specifically, read the article on magnesium for sleep.
- Sluggish gut: citrate.
- Active days: malate, which is usually gentle and suits daytime use.
- Several needs at once: a complex with several forms.
- Oxide: only when price matters more than absorption.
How much magnesium do you need per day?
The Swedish Food Agency sets an adequate intake of 300 mg of magnesium per day for women and 350 mg for men (NNR 2023). The EU reference value used on labels is 375 mg. The upper limit for magnesium from supplements is 250 mg per day. Magnesium contributes to normal muscle function, normal functioning of the nervous system and the reduction of tiredness and fatigue.
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Heey! Rest & Recover is a vegan powder with four magnesium forms: 225 mg of magnesium per 7 g serving (60 percent of the reference value) plus 3,000 mg of glycine. 30 servings, 259 SEK, made in Sweden. Rest & Recover
Frequently asked questions
Which magnesium is best?
It depends on the need. Glycinate is gentle on the stomach and suits the evening, citrate suits a sluggish gut and malate suits daytime. Magnesium oxide is the least absorbed of the common forms.
Which magnesium is best for sleep?
Magnesium glycinate is the form most often chosen for the evening, because it is gentle on the stomach. Dose, timing and how long it takes are covered in the article on magnesium for sleep.
What does elemental magnesium on the label mean?
Elemental magnesium is the actual amount of magnesium in the dose. 1,000 mg of magnesium citrate contains roughly 160 mg of magnesium. Compare mg of magnesium per dose between products, not the weight of the compound.
Can you take too much magnesium?
Yes. The upper limit for magnesium from supplements is 250 mg per day, because more can cause diarrhoea. If you have kidney disease or take prescription medicines, check with a doctor first.
Magnesium glycinate or citrate?
Both are well absorbed. Glycinate is gentler on the stomach and suits the evening. Citrate can loosen stools at higher doses, so it fits a sluggish gut better.
Do you need a magnesium supplement if you eat a varied diet?
Usually not. Magnesium deficiency is very rare, and wholegrains, legumes, leafy greens and nuts provide plenty of magnesium. A supplement can top up a low intake.
Related pages
Sources
- Swedish Food Agency (Livsmedelsverket). "Magnesium" (adequate intake per NNR 2023, upper limit from supplements). livsmedelsverket.se
- Firoz M, Graber M. "Bioavailability of US commercial magnesium preparations." Magnesium Research, 2001. pubmed.ncbi.nlm.nih.gov
- Blancquaert L, Vervaet C, Derave W. "Predicting and Testing Bioavailability of Magnesium Supplements." Nutrients, 2019. pmc.ncbi.nlm.nih.gov
- Commission Regulation (EU) No 432/2012 on permitted health claims. eur-lex.europa.eu
Last updated: 14 September 2026.
