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Magnesium L-threonate in human trials

Three small, short randomized placebo-controlled trials, each with industry ties to the ingredient, plus the rat work that launched the compound. Promising, not independently replicated.

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Editorial section. Research summaries are not product claims and contain no product links or offers. A summary is never proof that any product works.

The question
What do randomized human trials show for magnesium L-threonate on sleep and memory, and who ran them?
Study design
A rat study (Slutsky 2010) and three randomized, double-blind, placebo-controlled human trials: 44 adults aged 50 to 70 with cognitive complaints for 12 weeks (Liu 2016), 80 adults aged 35 to 55 with self-reported sleep problems taking 1 g a day for 21 days (Hausenblas 2024), and 109 healthy adults aged 18 to 65 taking 2 g a day of a formula for 30 days (Zhang 2022). [1][2][3][4][5]
What they found
In rats, the compound raised brain magnesium, increased hippocampal synapse density and improved learning and memory. In the 12-week human trial, a composite cognition score improved more than with placebo, but strong placebo effects meant the authors could not determine any effect on sleep or anxiety. In the 21-day sleep trial, the magnesium L-threonate group kept stable sleep quality and daytime function while the placebo group declined, with better Oura ring deep and REM sleep scores and better self-rated mood, energy and alertness. In the 30-day trial, a formula that also contained phosphatidylserine and vitamins C and D improved memory test scores versus a starch placebo. [1][2][3][4][5]
Limitations
Every human trial has an industry link: Liu 2016 was run by researchers at Neurocentria, the developer of the tested product; three of six Hausenblas 2024 authors work at AIDP, an ingredient supplier; Zhang 2022 was funded by Wu-xi Magtein Bioscience. Samples were small, follow-up was 3 to 12 weeks, many outcomes were measured, and the largest trial tested a multi-ingredient formula, so its result cannot be credited to magnesium L-threonate alone. Sleep ring scores are consumer-device estimates, not lab sleep studies.
What this does not mean
These trials do not show that magnesium L-threonate treats insomnia, memory loss or any disease, or that it beats cheaper magnesium forms, which were not compared head to head. Our claim is structure/function only: supports relaxation and restful sleep. NIH's Office of Dietary Supplements sets the adult upper limit for supplemental magnesium at 350 mg a day; high doses can cause diarrhea, and people with kidney disease or on prescription drugs should ask a clinician first.
Sources
  1. Slutsky I et al. Neuron. 2010;65(2):165-177. doi.org/10.1016/j.neuron.2009.12.026
  2. Liu G et al. J Alzheimers Dis. 2016;49(4):971-990. doi.org/10.3233/JAD-150538
  3. Hausenblas HA et al. Sleep Med X. 2024;8:100121. doi.org/10.1016/j.sleepx.2024.100121
  4. Zhang C et al. Nutrients. 2022;14(24):5235. doi.org/10.3390/nu14245235
  5. NIH Office of Dietary Supplements: Magnesium fact sheet for health professionals. ods.od.nih.gov/factsheets/Magnesium-HealthProfessional/

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