All Supplements
Magnesium vs Selenium
Side-by-side comparison — benefits, dosage, forms, and research.
Feature
Magnesium
Selenium
Typical Dosage
200-400mg elemental magnesium daily
55–200 mcg daily
Best Form
Magnesium Glycinate
Selenomethionine
Key Benefits
5
5
Evidence Rating
★★★★★
★★★★
Best Time
Evening for sleep benefits, split doses for absorption
With meals to enhance absorption; consistent daily timing
Magnesium Benefits
✓Sleep quality improvement
✓Muscle relaxation and cramp prevention
✓Stress and anxiety reduction
✓Blood pressure regulation
✓Energy production
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 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 if your primary goal is: sleep quality improvement. 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.