Quick Verdict
Beta-Alanine
Increases intramuscular carnosine levels, buffering acid (H+) during high-intensity exercise. Delays neuromuscular fatig
Evidence: strong (200+ 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
| Beta-Alanine | Vitamin D3 | |
|---|---|---|
| Category | performance | vitamins |
| Evidence Level | strong | strong |
| Studies | 200+ | 1000+ |
| Dosage | 2-5 g | 1000-5000 IU |
Stack Compatibility
Beta-Alanine: Creatine (synergistic — different mechanisms), Sodium bicarbonate, Citrulline malate
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.