Side-by-side comparison of mechanisms, dosing, interactions, and stacking potential.
| Caffeine (Anhydrous) | Peak ATP (Adenosine 5'-Triphosphate Disodium) | |
|---|---|---|
| Category | Training Compounds | Training Compounds |
| Standard Dose | 100-400mg daily (1-3mg/kg bodyweight for cognitive; 3-6mg/kg for athletic performance) | — |
| Timing | 30-60 min before exercise or cognitive demand. Avoid within 8-10 hours of bedtime (half-life: 5-6 hours, but CYP1A2 polymorphisms cause wide variation). Morning preferred. | — |
| Cycle Duration | ongoing with periodic tolerance resets (1-2 weeks off every 8-12 weeks) | — |
| Evidence Level | strong_human | Moderate |
Caffeine is a methylxanthine that primarily acts as a competitive adenosine A1 and A2A receptor antagonist. By blocking adenosine's inhibitory effects on neural activity, caffeine increases alertness, reduces perceived exertion, and delays fatigue. Downstream effects include: increased dopamine, norepinephrine, and acetylcholine release; enhanced calcium release from sarcoplasmic reticulum (direct muscle contraction enhancement); increased fat oxidation via enhanced lipolysis (HSL activation through cAMP/PKA pathway from PDE inhibition); and central drive enhancement (reduced RPE). Caffeine also inhibits phosphodiesterase (PDE), raising intracellular cAMP.
100-400mg daily (1-3mg/kg bodyweight for cognitive; 3-6mg/kg for athletic performance)
30-60 min before exercise or cognitive demand. Avoid within 8-10 hours of bedtime (half-life: 5-6 hours, but CYP1A2 polymorphisms cause wide variation). Morning preferred.
ongoing with periodic tolerance resets (1-2 weeks off every 8-12 weeks)
Oral ATP supplement that increases extracellular ATP levels, improving blood flow via purinergic receptor activation on endothelial cells. Enhances muscular excitability, recovery, and lean body mass. Does not significantly raise intracellular ATP (that's produced endogenously).
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