Comparison
Magnesium Threonate vs Glycinate: What Trials Show
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Magnesium L-threonate is a newer, pricier form that gets a lot of attention for sleep and thinking, while glycinate is a popular everyday form. This page lines up what trials show and what they don’t. This is information only. For magnesium in general, see our magnesium guide, for products see best magnesium supplements, and for the other common comparison see glycinate vs citrate.
Side by side
| Magnesium L-threonate Magnesium bound to threonate, sold as Magtein and other brands | Magnesium glycinate Magnesium bound to the amino acid glycine (also called bisglycinate) | |
|---|---|---|
| What it is | Magnesium combined with L-threonic acid, a form that trial authors say raises brain magnesium in lab studies. | Magnesium combined with glycine, an amino acid. Labels may say glycinate or bisglycinate. |
| Human trials on sleep and thinking | Two 3-to-6-week placebo-controlled trials in adults with self-reported sleep problems, plus a formula trial on memory in healthy adults. | We found no trial testing glycinate specifically for sleep or thinking. |
| What those trials found | Mixed. One trial reported better sleep scores, including from a wearable ring. Another found better overall thinking-test scores but no group difference in sleep measured by a ring. | No glycinate-specific result to report. A review of magnesium for sleep in older adults found low-quality evidence for all forms. |
| Who funded the research | The larger trial was funded by the product's owner. Another was funded by a Magtein maker, and some authors of the third are affiliated with a company. | Not applicable: no glycinate-specific trial found. |
| Typical cost (per 365 mg elemental magnesium) | Not shown: no magnesium threonate products in our product data yet. | From £0.190 (UK, a glycinate, citrate and malate blend) or $0.694 (US) to $1.58 (US, NSF Certified for Sport), checked Nov 1 to 3, 2026. |
| Who might prefer it | We found no evidence on who should choose each form, so we make no claim. | Same: compare on elemental magnesium, testing and price. |
Our verdict
We can't say which is better for sleep or anything else, because no trial compared them. The threonate trials are small, mostly short and several have links to the companies that sell it, while we found no glycinate-specific trial at all. Consider both unproven for sleep, and compare products by elemental magnesium, named testing and price.
Where to buy
What magnesium L-threonate trials show
80 adults aged 35 to 55 with self-reported sleep problems (21 days, 1 g a day). The authors reported better sleep quality and daytime functioning than placebo, measured by questionnaires and a wearable ring. Some authors are affiliated with a company (AIDP, Inc.), and an erratum (a correction notice) was published for the paper; the notice we could open does not say what it changed. Source: Hausenblas HA et al., Sleep Med X, 2024 (PubMed · DOI).
100 adults aged 18 to 45 with dissatisfied sleep (6 weeks, 2 g a day). Compared with placebo, the group had a greater improvement in an overall thinking-test score (p = 0.043) and in a self-reported measure of sleep-related impairment. There were no group differences in sleep measured by a ring, or in several other sleep questionnaires. The trial was funded by Threotech Inc, which supplied the product and helped design the study. A correction was later published for the paper. Source: Lopresti AL et al., Front Nutr, 2025 (PubMed · DOI).
109 healthy Chinese adults (30 days, 2 g a day of a formula). A threonate and phosphatidylserine formula was linked to better memory-test scores. Because the formula contained other ingredients, we can’t say threonate alone caused it. It was funded by Wu-xi Magtein Bioscience. Source: Zhang C et al., Nutrients, 2022 (PubMed · DOI).
The amounts above are grams of the whole compound, not elemental magnesium, and we haven’t verified an elemental figure.
What we know about glycinate
We found no trial testing magnesium glycinate for sleep or thinking tests, so we make no claim for it. A review of three trials of magnesium for sleep in older adults found low to very low quality evidence, and did not compare forms. Source: Mah J et al., BMC Complement Med Ther, 2021 (PubMed · DOI). A review of how well magnesium forms are absorbed compared organic and inorganic forms, not glycinate with threonate. Source: Pardo MR et al., Nutrition, 2021 (PubMed · DOI).
Why we can’t pick a winner
No trial compared the two forms, and the threonate trials differ in dose, product, length and funder. Sleep is hard to measure, and in the 100-adult trial the objective ring data did not differ between groups. Small trials with company links are early evidence, not proof.
Talk to your doctor or pharmacist
Talk to your doctor or pharmacist before you start any supplement, especially if you are pregnant or breastfeeding, take prescription medicine, or have a health condition. Ask first if you have kidney problems or take osteoporosis tablets, certain antibiotics, water tablets or acid-reducing medicine, because magnesium can interact with them. If you have ongoing sleep problems, speak to a doctor or pharmacist rather than relying on a supplement.
FAQ
Magnesium threonate vs glycinate: which is better for sleep?
No one can say. We found no trial comparing them. Threonate has a few small trials, some company-linked, with mixed sleep results, and we found no glycinate-specific sleep trial.
Does magnesium threonate help with thinking tests?
Two trials reported better test scores than placebo, but they were small, short and linked to companies that sell it. One formula contained other ingredients too. That makes it early evidence.
Is magnesium threonate worth the higher price?
We can’t say. The evidence is early and no trial compared it with cheaper forms. If you try magnesium, compare products on elemental magnesium and named testing, and ask a doctor or pharmacist first.