Dr Stacy Sims on Magnesium L-Threonate: What Women Should Know
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Dr. Stacy Sims has built her career on rewriting the rules of performance, recovery, and health for women. As an exercise physiologist and nutrition scientist, she’s spent decades uncovering the physiological differences that make women’s needs unique and translating that science into practical, actionable advice.
Her mantra, “Women are not small men,” has become a rallying cry in the world of female sports and wellness, and it’s one she applies to everything from training strategies to supplementation. One supplement she frequently highlights for women is Magnesium L-Threonate.
This specific form of magnesium, known for its ability to support brain health, sleep, and mood, is especially relevant for women navigating stress, perimenopause, or sleep disruptions. In this article, we’ve curated Dr. Sims’ advice on magnesium L-threonate, why it matters, and how to use it effectively.
What Magnesium L-Threonate Is and Why Women Need It
Magnesium is an essential mineral involved in over 300 biochemical reactions in the body, from energy production to muscle and nerve function. Yet, most people, especially women, don’t get enough through diet alone.
What makes magnesium L-threonate unique is its bioavailability to the brain. Unlike other forms such as citrate or oxide (which mainly support digestion), magnesium L-threonate is highly effective at crossing the blood–brain barrier. This means it can have a great impact on cognitive health, mood, and sleep regulation.
Dr. Sims often points out that women, particularly during times of hormonal fluctuation, like perimenopause and menopause, experience changes in sleep quality, cognitive sharpness, and emotional stability. Magnesium L-threonate can offer a targeted way to support the body and brain during these times and help women dealing with brain fog, anxiety, or poor sleep.
What the Research Says
Research on magnesium L-threonate has shown improvements in sleep quality, working memory, and attention after several weeks of supplementation. In one placebo-controlled trial, participants who took magnesium L-threonate experienced deeper slow-wave and REM sleep and reported feeling more refreshed and focused the next day.
While most of the existing data involves older adults, the mechanisms (i.e.improved neural communication and sleep architecture) are directly relevant to women of all ages, especially those in perimenopause or menopause. This is when declining estrogen can disrupt sleep patterns and cognitive performance.
For Dr. Sims, magnesium L-threonate fits squarely into her broader philosophy of optimizing women’s recovery and performance through evidence-based, physiology-driven interventions.
How to Choose and Use a Magnesium Supplement
With many different types of magnesium on the market, knowing which one to pick can feel confusing. Dr. Sims simplifies it: “If you’re looking for better sleep, mood, or brain health, magnesium L-threonate is the form to go for.”
Here’s how she recommends approaching it:
Choose based on your goal: For sleep, focus, and calm, go with magnesium L-threonate. It’s designed for cognitive and neural support.
Check the form and dosage: Most studies use 1,500–1,800 mg per day of magnesium L-threonate (which delivers around 100–150 mg of elemental magnesium).
Time it right: Dr. Sims suggests taking it in the evening, about 30 to 60 minutes before bed, to support relaxation and deep sleep.
Stack it smartly: She often pairs magnesium L-threonate with calming compounds like L-theanine and apigenin, a combination that can help quiet the mind and promote more restorative sleep.
Look for purity and transparency: Choose supplements that are third-party tested, such as NSF Certified for Sport®.
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Mind total magnesium intake: The general upper limit for supplemental magnesium is 350 mg of elemental magnesium per day, though magnesium L-threonate contains much less elemental magnesium than that. Still, check your other supplements and talk to your healthcare provider if you have kidney issues, are pregnant, or take medications.
Practical Guidance for Women
| Strategy | Why It Matters |
|---|---|
| Start in your 30s–40s | Supports sleep and brain function before perimenopausal changes intensify |
| Use magnesium L-threonate for brain and sleep | Crosses the blood–brain barrier; targets neural health, not digestion |
| Take it in the evening | Helps promote calm and restorative sleep |
| Combine with L-theanine + apigenin | Enhances relaxation and sleep onset |
| Choose tested, transparent brands | Ensures purity, accuracy, and consistency across batches |
| Stay consistent | Benefits build over weeks as magnesium stores replenish |
Magnesium L-threonate isn’t a magic bullet, but for women navigating stress, hormonal transitions, or sleep struggles, it can be a powerful ally.
Dr. Sims’ approach is always rooted in context: understanding your physiology, matching your supplements to your goals, and choosing products that back up their claims with science and transparency.
“Women deserve better data and better tools. When used correctly, magnesium L-threonate can help support brain health, calm, and restorative sleep—all things women need more of.”
Shop Momentous Magnesium L-Threonate
Ready to put Dr. Sims’ advice into practice and help support your sleep, brain health, and recovery?
Try Momentous Magnesium L-Threonate, formulated with transparency, backed by science, and crafted to help you feel calmer, sharper, and more rested, night after night.
Dr. Sims has partnered with Momentous for many years and regularly uses Momentous Nightly Sleep, which is a combination of Magnesium L-Threonate, Apigenin, and L-Theanine.
She also co-developed The Women’s Three, a daily stack of Iron, Calcium, and Vitamin D3, designed to support foundational health for performance-driven women across all phases of life.
