Quick Verdict
Vitamin D3
Actually a steroid hormone precursor. Critical for calcium absorption, immune function, hormone production. Widespread d
Evidence: strong (1000+ studies)
Zinc
Essential trace mineral for 300+ enzymes. Critical for testosterone, immune function, protein synthesis. Most athletes a
Evidence: strong (500+ studies)
Side-by-Side Comparison
| Vitamin D3 | Zinc | |
|---|---|---|
| Category | vitamins | minerals |
| Evidence Level | strong | strong |
| Studies | 1000+ | 500+ |
| Dosage | 1000-5000 IU | 15-40 mg |
Stack Compatibility
Vitamin D3: Magnesium (essential cofactor), Vitamin K2 (MK-7), Calcium (if dietary intake low), Zinc
Zinc: Magnesium (sleep + hormone synergy), Vitamin D3, Copper (if long-term Zn use), Boron
Which Should You Choose?
Both serve different purposes. Choose based on your priority.