All Supplements
Magnesium L-Threonate vs Selenium
Side-by-side comparison — benefits, dosage, forms, and research.
Feature
Magnesium L-Threonate
Selenium
Typical Dosage
1,500-2,000mg (providing ~144mg elemental Mg)
55–200 mcg daily
Best Form
Magnesium L-Threonate (Magtein)
Selenomethionine
Key Benefits
5
5
Evidence Rating
★★★
★★★★
Best Time
Evening — has calming/sleep-promoting effects
With meals to enhance absorption; consistent daily timing
Magnesium L-Threonate Benefits
✓Crosses blood-brain barrier
✓May improve memory and learning
✓Sleep quality improvement
✓Brain magnesium levels
✓Potential neuroprotective effects
Selenium Benefits
✓Antioxidant protection through selenoprotein synthesis
✓Thyroid hormone metabolism and immune function
✓Reduced inflammation and oxidative stress
✓Male fertility and sperm motility support
✓Potential cognitive and cardiovascular health support
Can You Take Both Together?
In most cases, Magnesium L-Threonate and Selenium can be taken together safely. However, always check the interactions section of each supplement and consult a healthcare professional if you take medication.
Which Should You Choose?
Choose Magnesium L-Threonate if your primary goal is: crosses blood-brain barrier. Choose Selenium if your primary goal is: antioxidant protection through selenoprotein synthesis. Many people take both as they target different aspects of health.
Disclaimer: This comparison is for educational purposes only. Always consult a healthcare professional before starting any supplement.