Training Compounds

Caffeine (Anhydrous)

Evidence: strong_human

Mechanism of Action

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.

Dosing Protocol

Standard: 100-400mg daily (1-3mg/kg bodyweight for cognitive; 3-6mg/kg for athletic performance)

Maintenance: 100-200mg/day for regular users

Administration: oral

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.

Duration: ongoing with periodic tolerance resets (1-2 weeks off every 8-12 weeks)

Notes

CYP1A2 genotype determines caffeine metabolism speed: -163C>A (rs762551) — AA homozygotes are 'fast metabolizers' who benefit most from pre-exercise caffeine, while AC/CC 'slow metabolizers' may experience more side effects and even reduced performance. Genetic testing is highly recommended before optimizing caffeine protocols. Tolerance develops in 7-14 days of regular use — periodic washouts (caffeine holidays) restore sensitivity. The lethal dose is approximately 10g for adults — bulk caffeine powder should NEVER be recommended. Coffee provides beneficial polyphenols beyond caffeine.

Stacking

  • L-Theanine (anxiolysis without sedation)
  • Creatine
  • Beta-Alanine
  • L-Tyrosine

Interactions

  • Ephedrine/sympathomimetics [HIGH] — Synergistic sympathomimetic stimulation — risk of tachycardia, hypertension, cardiac events
  • MAO inhibitors [HIGH] — Reduced caffeine metabolism — risk of excessive stimulation
  • Fluoroquinolone antibiotics (ciprofloxacin) [MEDIUM] — Ciprofloxacin inhibits CYP1A2, dramatically reducing caffeine clearance
  • Oral contraceptives [MEDIUM] — OCs inhibit CYP1A2, increasing caffeine half-life by ~50%
  • Adenosine (IV, for SVT) [HIGH] — Caffeine directly antagonizes therapeutic adenosine — higher doses needed

Contraindications

  • Uncontrolled hypertension
  • Cardiac arrhythmias (especially SVT)
  • Anxiety disorders (GAD, panic disorder)
  • Pregnancy (>200mg/day associated with increased miscarriage risk)
  • GERD/peptic ulcer disease

Side Effects

  • Insomnia
  • Anxiety/jitteriness
  • Tachycardia/palpitations
  • GI upset/acid reflux
  • Dependency/withdrawal headaches
  • Increased blood pressure (acute)
  • Diuresis
  • Tremor

Key Papers

  • 10.1186/s12970-020-00383-4
  • 10.1080/15502783.2018.1550422
  • 10.1111/bcp.13661

Source Quality

Caffeine anhydrous (pure, powdered) provides precise dosing vs coffee (~80-150mg variable per cup). Sustained-release caffeine (Infinergy/caffeine malate) reduces peak-trough fluctuations. Capsule form prevents accidental overdose (pure caffeine powder is dangerous — 10g can be lethal). Brands: Thorne Caffeine, ProLab Caffeine, Nutricost.

Disclaimer: This information is for educational purposes only and is not medical advice. BioAccelera Labs does not diagnose, treat, or prescribe. Consult a licensed healthcare provider before using any compound.

Should Caffeine (Anhydrous) Be in Your Stack?

Take the free assessment and get personalized recommendations based on your biology and goals.

Get Your Free Protocolor take the assessment →
← Browse All 231 Compounds