Mag Threonate by Ortho Molecular: Dosing & Who It Suits

Quick answer: Mag Threonate is Ortho Molecular's magnesium L-threonate capsule: two capsules deliver 2 g of Magtein® magnesium L-threonate, which supplies 144 mg of elemental magnesium. It's built for adults who want magnesium aimed at focus, memory, sleep quality and mood rather than general mineral intake. The label dose is 2 capsules a day, so a 60-count bottle lasts a month, and at Covenant Health Products it's available through our clinic after a free appointment.

Clinical review pending — Holistic Health Partners

The call with the clinic took eleven minutes, and most of it was Renata Lindqvist reading labels out loud. She is 52, tunes pianos for three school districts, and keeps her supplements in a tackle box on the passenger seat. She had heard "mag threonate" on a sleep podcast somewhere between two elementary schools and written it on the back of an invoice. The first question on the call wasn't about the podcast. It was how much magnesium was already in the tackle box. Renata didn't know. That turned out to be the useful answer.

Here is what she learned before anything shipped.

What is Mag Threonate?

Mag Threonate is a two-ingredient capsule from Ortho Molecular Products®: magnesium bound to L-threonic acid (threonate), sold under the patented ingredient name Magtein®. Each two-capsule serving holds 2 g of magnesium L-threonate, which works out to 144 mg of elemental magnesium. The other ingredients are the vegetable capsule and magnesium stearate, and the product contains no gluten, corn, yeast, or artificial colors or flavors (Ortho Molecular Products).

Ortho Molecular positions it for brain function rather than general magnesium intake: mental focus and clarity, memory, sleep quality and mood. That's the difference between this and a magnesium glycinate or citrate, which are usually chosen for everyday mineral intake, relaxation or regularity.

Ortho Molecular sells only through licensed practitioners, so at Covenant this capsule comes through our partner clinic, Holistic Health Partners. A free appointment sets up your access.

Mag Threonate 60c

$62.10

Mag Threonate by Ortho Molecular Products – Brain-Targeted Magnesium Support Mag Threonate by Ortho Molecular Products delivers a clinically studied form of brain-targeted magnesium formulated… Click here to read more

What does magnesium L-threonate do, and why the threonate?

Magnesium L-threonate is magnesium paired with threonate, a sugar acid that researchers have studied for its ability to carry magnesium into the brain. Magnesium itself is a cofactor in more than 300 enzyme reactions, and in the brain it helps with nerve signaling, the making of neurotransmitters, and calming excitatory signals. Blood magnesium is tightly regulated, so how much reaches brain tissue is a separate question from how much you swallow.

The threonate form traces back to a 2010 study from MIT researchers, done in rats, which found that raising brain magnesium with this newly developed compound improved learning and memory in the animals. Ortho Molecular's product sheet cites that work, calls it the only magnesium complex shown to specifically raise magnesium within the brain, and says it has raised magnesium in the cerebrospinal fluid within about two weeks. Animal findings are a reason to run human trials, not proof on their own, so here is what the human trials show.

How much magnesium are you actually getting?

Less than the 2 g on the front suggests. Most of the weight of magnesium L-threonate is the threonate, so 2 g of the compound gives you 144 mg of elemental magnesium, about a third of the daily value. That's the number to add up against any other magnesium you take, which is exactly the question Renata couldn't answer.

What does the research on magnesium L-threonate show?

Three placebo-controlled human trials have tested magnesium L-threonate at doses from 1 g to 2 g a day, and they point toward support for memory, focus and sleep quality, with some honest gaps.

• Cognition and sleep in younger adults, 2 g a day. In a six-week trial, 100 adults aged 18 to 45 who were dissatisfied with their sleep took 2 g of Magtein® daily or a placebo. The magnesium group improved more on an overall cognition score from the NIH Cognitive Toolbox, with the largest effects on working and episodic memory, and had faster reaction times. They also reported less sleep-related impairment during the day, but the sleep-tracking ring showed no difference in measured sleep, and a reasoning test didn't change. The study was funded by Threotech, the company behind the Magtein ingredient, which also supplied the product (Lopresti and Smith, 2026).
• Sleep quality in midlife adults, 1 g a day. In a 21-day trial, 80 adults aged 35 to 55 with self-reported sleep complaints took 1 g of magnesium L-threonate daily or a placebo. Ring data showed better deep sleep and REM sleep scores in the magnesium group, and participants reported better mood, energy, alertness and productivity during the day. It was well tolerated. Three of the six authors work for AIDP, which distributes Magtein (Hausenblas et al., 2024).
• Memory and executive function in adults 50 to 70. In a 12-week trial, 44 adults whose test scores, especially for executive function, ran below age-matched norms took a magnesium L-threonate preparation called MMFS-01 or a placebo. Dosing was about 25 mg per kilogram of body weight: 1.5 g a day for people weighing 50 to 70 kg and 2 g for 70 to 100 kg. Overall cognitive scores improved more than with placebo. Effects on sleep and anxiety couldn't be judged because the placebo group improved too, and digestive complaints were about as common on placebo as on the supplement (Liu et al., 2016).

What the research doesn't show: there are no published trials of Ortho Molecular's finished capsule itself, the studies are small and mostly industry-funded, and measured sleep improved in one trial but not the other. The evidence is for the Magtein® ingredient at the doses above.

How do you take Mag Threonate?

Take 2 capsules a day, or as your health care professional recommends. That's the full label direction, and the table below fills in the practical questions around it.

The upper limit applies only to magnesium from supplements and medicines, not food, according to the NIH Office of Dietary Supplements. If you already take a multivitamin with magnesium, a separate magnesium glycinate at night, or a magnesium-containing antacid, the totals can climb past 350 mg without anyone noticing. Sorting that out is a good use of your clinic appointment, and it's how you get access to Mag Threonate at Covenant in the first place.

A few habits help:

• Write down every magnesium source first. Multivitamins, sleep formulas, electrolyte powders and antacids all count.
• Pick a time and keep it. If your goal is sleep, many people split the dose and take the larger part in the evening.
• Keep a two-week log. Note how you slept and how focused you felt for a week before you start and for a few weeks after. It gives your practitioner something better than "I think it helps."

Who is Mag Threonate for, and who should skip it?

It's for adults who want a magnesium chosen for the brain side of things: focus, memory, sleep quality and mood. That usually looks like:

• Adults in midlife who want nutritional support for focus and memory
• People who want magnesium as part of an evening wind-down routine
• Someone already taking magnesium glycinate or citrate for general intake who wants a form aimed at the brain
• Anyone whose practitioner is building a focus or sleep plan and wants a magnesium piece in it

Skip it, or talk with your practitioner first, if you:

• Are pregnant or nursing. Ortho Molecular's product sheet says to consult your physician first, and our store listing says not to use it while pregnant or nursing. Skip it unless your physician has said otherwise.
• Have reduced kidney function. Healthy kidneys clear extra magnesium. The NIH notes that the risk of magnesium toxicity rises when kidney function is impaired, because that clearance is reduced or lost.
• Take bisphosphonates or certain antibiotics. Magnesium can reduce absorption of oral bisphosphonates such as alendronate; the NIH advises separating them by at least 2 hours. Tetracycline and quinolone antibiotics should be taken at least 2 hours before or 4 to 6 hours after a magnesium supplement.
• Take diuretics or a long-term acid-reducing medicine. Some diuretics change how much magnesium you lose, and long-term proton pump inhibitor use can lower magnesium. Your prescriber should know before you add any magnesium.
• Are buying for a child. The trials enrolled adults, and this is an adult formula.

The side effect most often linked to magnesium supplements is loose stools, sometimes with nausea or cramping, and it's more common at higher doses and with forms like magnesium oxide. In the trials above, magnesium L-threonate was reported as well tolerated. If your stomach complains, splitting the dose or taking it with food is the first fix.

How does Mag Threonate compare with other magnesium L-threonate options we carry?

Every capsule option below uses the same Magtein® ingredient and reaches 2 g a day at its full label dose; the differences are capsule count, added ingredients and how you get it. Quicksilver Scientific® makes a liquid version at half the dose.

None of these is the right one for everybody. Magtein L-Threonate Plus by Integrative Therapeutics matches the 2 g dose and adds vitamins C and D3, so it suits people who don't already take a vitamin D supplement. Mag L-Threonate by Metagenics lets you start at two capsules and move to three. Liposomal Magtein by Quicksilver Scientific is the pick if you'd rather drink it than swallow capsules; our Liposomal Magtein guide covers it in more depth. Mag Threonate is the simplest of the capsules, two a day with nothing added, and it comes with a clinic team that looks at everything else you take.

Magtein L-Threonate Plus 90c

$42.00

Magtein® L-Threonate Plus by Integrative Therapeutics® – Cognitive Support Magnesium Magtein® L-Threonate Plus by Integrative Therapeutics® is a magnesium L-threonate supplement formulated to support cognitive… Click here to read more

Mag L-Threonate 120c

$76.95

Magtein® Magnesium L-Threonate by Metagenics – Cognitive and Brain Health Support Magtein® Magnesium L-Threonate by Metagenics provides a specialized form of magnesium formulated to support… Click here to read more

Liposomal Magtein 15.2 oz

$85.00

Liposomal Magtein – Magnesium L-Threonate for Brain & Sleep Support Liposomal Magtein by Quicksilver Scientific is a premium liquid magnesium supplement designed to support brain… Click here to read more

Why is Mag Threonate only available through our clinic?

Ortho Molecular sells its formulas only through licensed health care practitioners, so a licensed practice has to stand between the bottle and you. At Covenant, that practice is Holistic Health Partners. On a short, free call, the clinic team sets up your access, asks what else you take, and helps you decide whether magnesium L-threonate is the right next step or whether the magnesium you already take simply needs a different form or time of day. The right supplements, not more supplements, is the way we put it.

Once you're set up, the full Ortho Molecular line, including Mag Threonate, opens on your account. Questions later? Call 800-627-6518.

Bottom line: is Mag Threonate worth trying?

If you want magnesium for focus, memory or sleep quality rather than general intake, Mag Threonate is a straightforward way to get the 2 g Magtein® dose used in the most recent cognition trial: two capsules, nothing added, a one-month bottle. The human research is encouraging but small, mostly industry-funded, and stronger for memory and how people feel during the day than for measured sleep. It's the wrong pick if you're pregnant or nursing, have reduced kidney function, or already take enough supplemental magnesium to push you past 350 mg a day. Results vary, and supplements aren't cures, but the right guidance and high-quality products can make a meaningful difference in how you feel and function.

Renata, for the record, counted. The tackle box held 260 mg of magnesium before anyone added a capsule.

Keep reading

• Pure Encapsulations Magnesium Glycinate: dosing and who it suits
• Pure Encapsulations Magnesium Citrate: a gentle, effective option
• Bergamot BPF by Ortho Molecular: benefits and side effects
• Natural D-Hist by Ortho Molecular: what's in it and who it suits

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.