Quick Verdict
Vitamin D3
Actually a steroid hormone precursor. Critical for calcium absorption, immune function, hormone production. Widespread d
Evidence: strong (1000+ studies)
Omega-3 (Fish Oil)
EPA and DHA are long-chain omega-3 fatty acids with potent anti-inflammatory, brain health, and cardiovascular benefits.
Evidence: strong (800+ studies)
Side-by-Side Comparison
| Vitamin D3 | Omega-3 (Fish Oil) | |
|---|---|---|
| Category | vitamins | fats |
| Evidence Level | strong | strong |
| Studies | 1000+ | 800+ |
| Dosage | 1000-5000 IU | 1000-3000 mg combined EPA+DHA |
Stack Compatibility
Vitamin D3: Magnesium (essential cofactor), Vitamin K2 (MK-7), Calcium (if dietary intake low), Zinc
Omega-3 (Fish Oil): Vitamin E (antioxidant protection of oils), Curcumin (anti-inflammatory synergy), CoQ10
Which Should You Choose?
Both serve different purposes. Choose based on your priority.