Quick Verdict
Magnesium
Essential mineral involved in 300+ enzymatic reactions. Critical for muscle function, sleep, energy production. Most peo
Evidence: strong (600+ studies)
Vitamin D3
Actually a steroid hormone precursor. Critical for calcium absorption, immune function, hormone production. Widespread d
Evidence: strong (1000+ studies)
Side-by-Side Comparison
| Magnesium | Vitamin D3 | |
|---|---|---|
| Category | minerals | vitamins |
| Evidence Level | strong | strong |
| Studies | 600+ | 1000+ |
| Dosage | 200-400 mg | 1000-5000 IU |
Stack Compatibility
Magnesium: Vitamin D3, Zinc (evening), Glycine, Melatonin (sleep synergy)
Vitamin D3: Magnesium (essential cofactor), Vitamin K2 (MK-7), Calcium (if dietary intake low), Zinc
Which Should You Choose?
Both serve different purposes. Choose based on your priority.