Side-by-side comparison of mechanisms, dosing, interactions, and stacking potential.
| Caffeine (Anhydrous) | Electrolyte Complex (Sodium, Potassium, Magnesium) | |
|---|---|---|
| Category | Training Compounds | Training Compounds |
| Standard Dose | 100-400mg daily (1-3mg/kg bodyweight for cognitive; 3-6mg/kg for athletic performance) | Varies by activity level: 500-1500mg sodium, 200-400mg potassium, 100-200mg magnesium per liter of fluid during exercise |
| 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. | Before, during, and after exercise. Daily electrolyte support for low-carb/ketogenic diets (increased electrolyte excretion). First thing in morning for general hydration. |
| Cycle Duration | ongoing with periodic tolerance resets (1-2 weeks off every 8-12 weeks) | ongoing during training; increased during heat, prolonged exercise, or ketogenic diet |
| Evidence Level | strong_human | strong_human |
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)
Electrolytes maintain critical physiological functions: Sodium (Na+) is the principal extracellular cation regulating plasma volume, blood pressure (via RAAS system), nerve impulse conduction (fast sodium channels), and glucose absorption (SGLT1 co-transporter). Potassium (K+) maintains resting membrane potential via Na+/K+-ATPase, essential for cardiac rhythmicity and muscle contraction. Magnesium (Mg2+) is required for ATP function (Mg-ATP), muscle relaxation (calcium antagonism), and >600 enzymatic reactions. Sweat contains ~40-60 mmol/L sodium, ~4-8 mmol/L potassium, and trace magnesium. Hyponatremia from excessive water intake without sodium replacement during prolonged exercise is potentially fatal.
Varies by activity level: 500-1500mg sodium, 200-400mg potassium, 100-200mg magnesium per liter of fluid during exercise
Before, during, and after exercise. Daily electrolyte support for low-carb/ketogenic diets (increased electrolyte excretion). First thing in morning for general hydration.
ongoing during training; increased during heat, prolonged exercise, or ketogenic diet
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