Quick Verdict
Caffeine
Most consumed psychoactive. Adenosine antagonist. Well-established ergogenic aid across nearly all exercise modalities.
Evidence: strong (1300+ 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
| Caffeine | Zinc | |
|---|---|---|
| Category | performance | minerals |
| Evidence Level | strong | strong |
| Studies | 1300+ | 500+ |
| Dosage | 3-6 mg/kg | 15-40 mg |
Stack Compatibility
Caffeine: L-theanine (1:2 ratio caffeine:theanine), Creatine, Tyrosine
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.