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Magnesium-L-Threonate: Can it Help with Brain Fog and Fibromyalgia Pain?

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Magnesium-L-Threonate and Cognition

Cognitive function tends to declines as we age. For most people, the decline is modest. This “semi-normal” decline is thought to be due in part to a decrease in the ability of cells to form communication contacts called synapses between one cell and another. A similar defect is seen with Alzheimer’s disease.

Animal studies show that one way to increase the number and function of synapses is to raise the brain’s level of the mineral magnesium. When scientists increase brain magnesium in lab rats, the rats become smarter, that is, they are thinking more rapidly and accurately than they did before. But, most forms of oral magnesium don’t pass easily from the blood into the brain. An exception is a form of magnesium developed by a research team from MIT, specifically for this purpose. This form is magnesium-L-threonate, which is being developed by Neurocentria, Inc., a pharmaceutical company, under the brand name of MMFS-01.

The Study

Neurocentria’s team with collaborating researchers from both the U.S. and China recently published a very important study. Their results strongly suggest that MMFS-01 can substantially improve mild cognitive function in aging humans. MMFS-01 is not yet commercially available. However, generic magnesium-L-threonate is available from several companies.

What is truly remarkable about the MMFS-01 study is that improvement in over-all cognitive function was seen within just six weeks. Improvement continued through 12 weeks — the full length of the study. Subjects treated with placebo did not improve much overall.

Volunteers for the Neurocentria study were ages 50 to 70. All had test score evidence of mild cognitive impairment. 25 subjects took MMFS-01 and 26 took a placebo. The treatment dose was between 1.5 and 2.0 grams per day in divided doses. Four different cognitive tests were taken before treatment and again at six and 12 weeks. These tests measured executive function, working memory, attention and a concept called episodic memory.


With magnesium-L-threonate, executive function significantly improved compared to placebo at six and 12 weeks. Working memory improved significantly at six weeks, but at 12 weeks, the placebo group had improved also. So, the difference between the groups at 12 weeks was no longer statistically significant. Attention improved in the MMFS-01 group compared to baseline, but this improvement was not statistically better than for those taking placebo. Episodic memory improved with MMFS-01 by week 12, but was not significantly better than that seen with placebo.

When overall cognitive ability was calculated by combining results from the four tests, subjects taking MMFS-01 scored significantly better than subjects taking placebo. This was true at week six (P=.017) and at week 12 (p=.003).  Also important, subjects taking MMFS-01 who had the largest increase in red blood cell magnesium levels were also the subjects most likely to show major cognitive improvement. There were no major side effects.

Magnesium and Fibromyalgia symptoms

Separate research suggests that magnesium might also help treat fibromyalgia (FM) pain. This might be because magnesium tends to inhibit the activity of NMDA (N-methyl-D-aspartate) receptors. Activation of NMDA receptors is believed to be one mechanism that creates the chronic pain associated with fibromyalgia. A 2015 clinical study from Mayo Clinic found that transdermal magnesium chloride spray taken twice daily for three weeks was followed by a reduction in fibromyalgia pain.

Take Home Thoughts

Should physicians treating fibromyalgia symptoms, including brain fog, offer magnesium-L-threonate as a potential treatment?

The arguments against:

  1. We don’t know whether brain fog in fibromyalgia has any relationship to the cognitive decline that is common with aging.
  2. We only have one clinical study to support the beneficial effects of magnesium-L-threonate.

The argument for:

  1. Brain fog is a major problem for our patients
  2. We have no proven fibromyalgia treatments for this distressing symptom.
  3. For most (but not all patients), side effects from magnesium are minimal — mainly diarrhea if we get the dose up too high.

Should patients with FM try magnesium-L-threonate on their own? I strongly recommend that all patients work with their doctor. Certain patients should not take extra magnesium, especially those with any degree of kidney dysfunction. Also, it would be useful to obtain a baseline red blood cell magnesium level and monitor that level as treatment proceeds.

Since MMFS-01 is not available, using other generic equivalents is reasonable. Of course, ideally, some angel would fund a good controlled study. But, as usual, that’s not likely to happen anytime soon.

In the meantime, if any readers of this decide to work with their doctors to try magnesium-L-threonate, I and other readers would be grateful to learn whether or not it helped. In the absence of research funding, the best way for us to learn which fibromyalgia treatments help will be for each of us to report our personal anecdotal experience along to each other. You can let us all know by posting a comment below.

This article was first published on ProHealth.com on June 10 13, 2016 and was updated on August 16, 2019.

Richard Podell, M.D., MPH, is a graduate of Harvard Medical School and the Harvard School of Public Health. He has been treating patients with ME/CFS and Fibromyalgia for more than 20 years. A clinical professor at New Jersey’s Robert Wood Johnson Medical School, Dr. Podell see patients at his Summit, NJ and Somerset, NJ offices.


Engen DJ, McAllister SJ, Whipple MO, et al. Effects of transdermal magnesium chloride on quality of life for patients with fibromyalgia: a feasibility study. Journal of Integrative Medicine. 2015 Sep; 13(5): 306-13. doi: 10.1016/S2095-4964(15)60195-9.


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3 thoughts on “Magnesium-L-Threonate: Can it Help with Brain Fog and Fibromyalgia Pain?”

  1. Ceejay101 says:

    I was drawn to this article because I have had Fibromyalgia for over 20 years and suffer from varying degrees of brain fog. However, upon reading about how this particular form of magnesium resulted in improved cognitive function and memory, I wondered if it would be safe and helpful for my 5 yr. old grand-daughter? She was developing normally until she was 18 months old, when she suffered a series of seizures. Following the seizures, she went through a prolonged period of episodic screaming, crying, banging her head, and though she had been weaned from a bottle, insisted on only drinking from one again. In short, she suffered a developmental reversal. She has been seen by top neurologists at top hospitals throughout the country. Last year they discovered she had a tethered cord, for which she had surgery. Over the past year she has experienced remarkable improvement in language and learning skills, though EEGs show her brain function is slower than normal. She also has memory problems, so she is constantly re-learning things, such as counting, and has difficulty remembering events or names much of the time. If anyone could tell me if my daughter should bring this magnesium to her doctor’s attention, I’d be grateful!

  2. aservant1 says:

    I wonder if Magnesium-L-Threonate has side effects on the digestive system. Whenever I have tried any kind of magnesium supplement, the effect has been severe diarrhea. (Think about Milk of Magnesia.)

  3. dbolam1 says:

    I’ve been taking Mg Threonate at bedtime for several months now to help with xanax withdrawal. It took me from 4 hrs. sleep to 6 hrs. immediately and made me feel less depressed. There was no improvement in cognition for me, and I continue to decline. When I tried to go off it after only 4 nights, I had withdrawal symptoms, so beware if you have low GABA levels. I cut to the starting dose of 2 caps. and am still on that, since I need the sleep so badly after 3 yrs. in benzo w/d. It did not affect my bowels, and I still have to take Mg citrate for that twice daily. I only wish the effects had stayed as strong as in the beginning. I honestly don’t see much effect anymore. I used my husband as a control and he had no changes at all on the threonate.

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