These Are the Best Magnesium Supplements | Rhonda Patrick, Ph.D.
FoundMyFitnessPublished on June 19, 2025
Summary authored by editor@wellifi.com
TLDR Summary
Magnesium is crucial for many bodily functions, and while dietary sources are best, supplements can help fill gaps. Organic magnesium salts like citrate, glycinate, taurate, and malate are recommended for their higher bioavailability. Magnesium threonate, interesting for its potential brain health benefits, requires further research to confirm its effectiveness. Individuals should choose supplements based on their health goals and the bioavailability of different magnesium forms.
Key Points
- The upper safe limit for daily supplemental magnesium intake is set at 350 milligrams to avoid gastrointestinal issues.
- For optimal absorption, magnesium supplements should be taken in smaller, divided doses throughout the day.
- Organic magnesium salts, including magnesium citrate, glycinate, taurate, and malate, are more bioavailable than inorganic forms like magnesium oxide, chloride, and sulfate.
- Magnesium threonate is particularly noted for its potential to improve brain function by crossing the blood-brain barrier more effectively.
- Human studies on magnesium threonate have shown mixed results, highlighting the need for more research to establish its benefits for cognitive health.
- Choosing a magnesium supplement that combines different forms of magnesium salts may offer broader benefits.
Understanding Magnesium Supplements: Types, Benefits, and Dosage
Magnesium is a vital mineral that plays numerous roles in the body, including muscle and nerve function, blood glucose control, and bone health. However, not everyone gets enough magnesium from their diet, leading to questions about supplementation. This article explores the different types of magnesium supplements, their bioavailability, and their potential health benefits, especially for brain health.
Magnesium Supplementation: How Much Is Too Much?
The US Institute of Medicine's Food and Nutrition Board has set the upper safe limit for daily supplemental magnesium intake at 350 milligrams. This dose is considered safe for most people, minimizing the risk of diarrhea or gastrointestinal issues, which are common with excessive magnesium intake. Notably, this guideline does not apply to dietary magnesium, suggesting that higher intakes from food sources may not only be safe but beneficial.
Maximizing Magnesium Absorption
For optimal absorption, it's recommended to take magnesium in divided, smaller doses throughout the day rather than a single large dose. This strategy enhances absorption and minimizes gastrointestinal discomfort. Among the various forms of magnesium supplements, organic magnesium salts like magnesium citrate, magnesium glycinate, magnesium taurate, and magnesium malate are more bioavailable than inorganic forms such as magnesium oxide, magnesium chloride, and magnesium sulfate. The term 'organic' in this context refers to the chemical presence of carbon, not the agricultural standard of organic production.
Magnesium Threonate: A Special Focus on Brain Health
Magnesium threonate has attracted attention for its potential impact on brain function. Due to the body's regulatory mechanisms, only a small portion of ingested magnesium reaches the brain. However, magnesium threonate may more effectively cross the blood-brain barrier, potentially improving cognition and decreasing amyloid-beta plaques in animal models. Despite this promise, human studies on magnesium threonate are limited and have shown mixed results, necessitating further research.
Choosing the Right Magnesium Supplement
To enhance bioavailability, opting for organic magnesium salts like magnesium glycinate or magnesium taurate is advisable. These forms not only provide magnesium but also offer additional health benefits from accompanying compounds like glycine and taurine. While magnesium threonate may not be the best option for meeting daily magnesium needs due to its low elemental magnesium content, it remains of interest for its potential brain health benefits.
Personal Supplement Choices
Choosing the right magnesium supplement can be daunting given the variety of forms available. Some individuals prefer supplements that combine different forms of magnesium salts for broader benefits. For example, products like Magnesi-Om by Moon Juice and Magnesium Glycinate by Pure Encapsulations are popular choices among those looking to supplement their magnesium intake.
Conclusion
Magnesium supplements can play an essential role in addressing dietary deficiencies and potentially support brain health. However, choosing the right form based on bioavailability and individual health goals is crucial. While magnesium threonate offers intriguing possibilities for cognitive support, more research is needed to fully understand its benefits.