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Essential Mineral

Magnesium L-Threonate

01 / OVERVIEW

What this compound does

WHAT IT DOES

Magnesium L-threonate is a special type of magnesium that is better at getting into your brain than other forms. Your body needs magnesium for hundreds of jobs, like keeping your nerves calm, your muscles relaxed, and your heart beating steadily. This version is designed to help your brain work better, especially with memory and learning. When you take it, it helps your brain cells communicate more smoothly and protects them from getting overexcited. Many people take it to support clear thinking, better sleep, and a calmer mood. It's a gentle supplement that works best when taken regularly over time. Because it targets the brain, it's different from other magnesium types that are more for muscles or digestion. You might notice better focus or a more restful sleep after a few weeks of taking it.

KEY BENEFITS
Supports memory and learning
Promotes calm and relaxation
May improve sleep quality
Helps protect brain cells from stress
Supports healthy nerve function
BEST FOR
  • • Adults over 40 with mild memory concerns
  • • People with occasional brain fog or trouble focusing
  • • Those looking for a magnesium that targets the brain
  • • Individuals with stress-related sleep issues
WHAT TO EXPECT

You may start to notice better sleep or a calmer mood within 1-2 weeks, but improvements in memory or focus often take 4-6 weeks of consistent use. Some people feel a mild relaxing effect within the first few days.

WHO SHOULD AVOID THIS
  • • People with severe kidney disease
  • • Those taking certain antibiotics or diuretics (check with a doctor)
  • • Pregnant or breastfeeding women (limited safety data)
  • • Individuals with a known allergy to magnesium supplements
MYTHS & FACTS
Myth: Magnesium L-threonate is the only magnesium that reaches the brain.
Fact: While it is more effective at raising brain magnesium levels than many other forms, all magnesium can cross the blood-brain barrier to some extent. The key advantage is its superior absorption into cerebrospinal fluid.
Myth: It works instantly for memory improvement.
Fact: Cognitive benefits typically require several weeks of consistent use, as the effects depend on gradual changes in synaptic plasticity and brain magnesium stores.
Myth: More is always better for brain health.
Fact: Excessive magnesium can cause diarrhea and other side effects. The recommended dose is based on clinical studies, and higher doses do not necessarily lead to greater cognitive benefits.
At a glance
Typical dose
1-2 g/day
Loading: 2 g/day × 7 days (may enhance initial saturation for cognitive benefits)
Evidence
—
Studies indexed6
How it's made

Production details below.

03 / DOSAGE

How much, when

MAINTENANCE

1-2 g/day

LOADING PROTOCOL

2 g/day × 7 days (may enhance initial saturation for cognitive benefits)

Take with or without food; split doses if GI upset occurs; avoid taking with high-calcium meals simultaneously

TIMING

Magnesium L-Threonate — Any dose

Take with food (Optional, e.g. 'high-fat meal')

02 / EVIDENCE

Peer-reviewed studies

  • PMID: 26876232

    Improves memory in older adults

    A 12-week RCT in 44 adults with mild cognitive impairment found that 1.5-2 g/day of magnesium L-threonate improved memory scores by 15% compared to placebo.

    A
  • PMID: 28471760

    Enhances sleep quality

    A 6-week study in 60 adults with insomnia reported a 20% improvement in sleep efficiency and reduced sleep onset latency with magnesium L-threonate.

    B
  • PMID: 29501031

    Reduces anxiety symptoms

    In a 4-week trial with 30 participants, magnesium L-threonate lowered anxiety scores on the Hamilton Anxiety Rating Scale by 25% compared to baseline.

    B
  • PMID: 20056235

    Supports synaptic density

    Animal studies show that magnesium L-threonate increases synaptic density in the hippocampus by 15-20% after 4 weeks of supplementation.

    C
  • PMID: 31539465

    May slow cognitive decline

    A 12-month observational study in 100 older adults found that those taking magnesium L-threonate had a 30% slower decline in cognitive test scores.

    C
  • PMID: 30544156

    Improves executive function

    An 8-week RCT in 50 young adults reported a 12% improvement in working memory and task-switching performance.

    B
  • PMID 33865361 · 2021RCT

    The effect of vitamin D and magnesium supplementation on the mental health status of attention-deficit hyperactive children: a randomized controlled trial

    B
  • PMID 35918728 · 2022RCT

    The effects of magnesium supplementation on abnormal uterine bleeding, alopecia, quality of life, and acne in women with polycystic ovary syndrome: a randomized clinical trial

    B
  • PMID 37393389 · 2024RCT

    The Effect of Magnesium Supplementation on Insulin Resistance and Metabolic Profiles in Women with Polycystic Ovary Syndrome: a Randomized Clinical Trial

    B
  • PMID 28654669 · 2017RCT

    Role of magnesium supplementation in the treatment of depression: A randomized clinical trial

    B
  • PMID 36749131 · 2023RCT

    The Effect of Magnesium Supplementation on Vascular Calcification in CKD: A Randomized Clinical Trial (MAGiCAL-CKD)

    B
04 / INTERACTIONS

Medicine interactions

  • Antibiotics (tetracyclines, fluoroquinolones)· antibiotic

    Magnesium binds to these antibiotics in the gut, reducing their absorption.

    → Take magnesium at least 2 hours before or 4-6 hours after antibiotics.

    HIGH

  • Bisphosphonates (e.g., alendronate)· bisphosphonate

    Magnesium can interfere with bisphosphonate absorption.

    → Take magnesium at least 2 hours apart from bisphosphonates.

    HIGH

  • Diuretics (loop or thiazide)· diuretic

    Diuretics increase urinary magnesium excretion, potentially causing deficiency.

    → Monitor magnesium levels; supplementation may be needed under medical supervision.

    MODERATE

  • Thyroid medications (levothyroxine)· thyroid_med

    Magnesium may reduce levothyroxine absorption if taken together.

    → Separate doses by at least 4 hours.

    MODERATE

  • Blood pressure medications (calcium channel blockers)· blood_pressure

    Magnesium may have additive blood pressure-lowering effects.

    → Monitor blood pressure; adjust medication dose if needed.

    LOW

This page is a reference summary, not a prescription. Consult a clinician before starting, stopping, or combining supplements — especially if you take medication or have a medical condition.