Guide
Magnesium glycinate vs orotate: what's actually different
Magnesium orotate carries less elemental magnesium per gram than glycinate and costs more to make. A 2025 EU novel-food safety review couldn't establish safety at the highest doses some manufacturers proposed. Here's the chemistry and what the review actually found.
Magnesium orotate pairs magnesium with orotic acid rather than glycine. Gram for gram it carries less elemental magnesium than glycinate — about 7% versus glycinate's 11–14% — and a 2025 EU food-safety review couldn't establish that a high-dose orotate product was safe at the level a manufacturer proposed, because of a long-standing safety question about orotic acid itself.
The two forms, side by side
| Magnesium glycinate | Magnesium orotate | |
|---|---|---|
| Formula | C4H8MgN2O4 | C10H6MgN4O8 |
| Molar mass | 172.42 g/mol (PubChem CID 84645) | 334.48 g/mol, anhydrous (PubChem CID 3036905) |
| Elemental magnesium by weight | ~11–14% | ~7% |
| Typically sold for | General daily supplementation | General daily supplementation, often marketed around heart and athletic-performance narratives |
| Recent independent human evidence vs. other forms | Tested directly against citrate and oxide (see below) | None found — no recent head-to-head trial against glycinate or any other form |
| Watch out for | Marketed as gentler than other forms, without a trial showing that | Lower elemental magnesium per gram means more raw material — and cost — is needed for the same elemental dose; a 2025 EU review flagged an unresolved safety question about orotic acid at high intakes |
Why orotate delivers less magnesium per capsule
Orotic acid is a much larger, heavier molecule than glycine, so each gram of magnesium orotate carries proportionally less actual magnesium. At roughly 7% elemental magnesium by weight, a capsule would need to contain about 60% more orotate than glycinate to deliver the same elemental dose — one reason orotate products are often formulated at lower elemental amounts than a glycinate capsule of comparable size.
What the 2025 EU safety review found
In 2025, EFSA's Panel on Nutrition, Novel Foods and Food Allergens reviewed an application to sell magnesium orotate dihydrate as a novel food, at a proposed maximum intake of 6,100 mg a day — roughly 5,000 mg of orotic acid and 400 mg of elemental magnesium daily. That magnesium amount alone exceeds the tolerable upper intake level EFSA sets for supplemental magnesium (250 mg/day), and the panel separately flagged a concern carried over from an earlier assessment: animal studies have shown orotic acid can promote tumor growth, and the safety margin between the no-observed-adverse-effect level from those studies and the exposure at the proposed use level was narrower than what the earlier review considered adequate, with no new data from the applicant to close that gap. The panel's conclusion: safety couldn't be established at the proposed use level, and it didn't get as far as assessing how well the magnesium in it is absorbed.
Two things worth being precise about. This review covers a specific proposed maximum use level, not every orotate product sold today — most commercial capsules are formulated well below 6,100 mg/day, partly because orotic acid is expensive to source at scale. And the tumor-promotion signal is about orotic acid, not magnesium itself; it doesn't apply to glycinate or any other magnesium salt.
What each is typically marketed for, and side effects
Magnesium orotate has a decades-old reputation in heart-health and athletic-performance marketing, built mostly on small studies from the 1990s and 2000s; we looked for a recent, independent human trial testing orotate against glycinate or any other form and didn't find one. Glycinate is marketed mainly on sleep support and gentleness — covered in full in magnesium glycinate and sleep: what the evidence actually shows. Both forms share magnesium's most common side effect at higher intakes, loose stools, more likely above the 350 mg/day supplemental upper limit for US adults; orotate carries the additional, separate orotic-acid question above.
Our product
Electric Tiger Magnesium Glycinate provides 275 mg of elemental magnesium per three-capsule serving, from 2,500 mg of magnesium glycinate — both numbers printed on the panel. 30 servings a bottle, as low as $16.31 a bottle on subscription. We don't sell an orotate product; this page compares the two forms as ingredients.
Questions people ask
What is the difference between magnesium glycinate and magnesium orotate?
Glycinate binds magnesium to the amino acid glycine and is about 11–14% elemental magnesium by weight. Orotate binds it to orotic acid and is about 7% elemental magnesium by weight — roughly half. They're marketed differently too: orotate leans on heart-health and performance narratives, glycinate on sleep and gentleness.
Is magnesium orotate better than glycinate?
We didn't find a recent independent human trial comparing the two directly on any outcome, so there's no head-to-head evidence either way. What we did find is a 2025 EU regulatory review that couldn't establish orotate's safety at a high proposed dose, because of an animal-based safety signal for orotic acid.
Is magnesium orotate safe?
At ordinary consumer doses, most commercial products are formulated well below the 6,100 mg/day level the 2025 EFSA review assessed and couldn't clear. That review's concern is specific to orotic acid at high intakes. If you're considering a high-dose orotate product, it's worth a conversation with a doctor or pharmacist first.
Related reading
- Types of magnesium compared
- Magnesium glycinate vs citrate
- How to choose a magnesium glycinate
- How much magnesium glycinate should you take a day?
Sources
- EFSA Panel on Nutrition, Novel Foods and Food Allergens. "Safety of magnesium orotate dihydrate as a novel food pursuant to Regulation (EU) 2015/2283 and bioavailability of magnesium from this source in the context of Directive 2002/46/EC." EFSA J. 2025;23(7):e9528. PMID 40642284.
- PubChem CID 84645 (magnesium glycinate) and CID 3036905 (magnesium orotate), National Library of Medicine.
- Electric Tiger Magnesium Glycinate Supplement Facts: product page.
Sources
- Safety of magnesium orotate dihydrate as a novel food pursuant to Regulation (EU) 2015/2283 and bioavailability of magnesium from this source in the context of Directive 2002/46/EC A 2025 EU food-safety review could not establish that magnesium orotate is safe at the highest dose a manufacturer proposed (roughly 5,000 mg/day of orotic acid), because of an animal-based tumour-promotion signal for orotic acid and too narrow a safety margin at that dose.
*These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.
