Quick Verdict
Caffeine
Most consumed psychoactive. Adenosine antagonist. Well-established ergogenic aid across nearly all exercise modalities.
Evidence: strong (1300+ studies)
Magnesium
Essential mineral involved in 300+ enzymatic reactions. Critical for muscle function, sleep, energy production. Most peo
Evidence: strong (600+ studies)
Side-by-Side Comparison
| Caffeine | Magnesium | |
|---|---|---|
| Category | performance | minerals |
| Evidence Level | strong | strong |
| Studies | 1300+ | 600+ |
| Dosage | 3-6 mg/kg | 200-400 mg |
Stack Compatibility
Caffeine: L-theanine (1:2 ratio caffeine:theanine), Creatine, Tyrosine
Magnesium: Vitamin D3, Zinc (evening), Glycine, Melatonin (sleep synergy)
Which Should You Choose?
Both serve different purposes. Choose based on your priority.