Caffeine
Also known as: Caffeine Anhydrous, 1,3,7-trimethylxanthine
Lower numbers = closer to natural. Higher numbers = more enhanced.
Why this rating?
Caffeine is genuinely ergogenic, it reliably improves endurance and strength performance, and it is also legal, unrestricted, permitted in sport, and consumed daily by most of the population. It works on adenosine receptors rather than on hormones, so it changes how hard you can train without changing your physiology. Rated 1 (basically natty), alongside creatine as part of the natural baseline.
Overview
The most widely used performance drug in the world, and one of the few whose ergogenic effect is beyond dispute. It belongs in this archive both because it genuinely improves training and because it is the missing third component of the classic ECA fat-loss stack alongside ephedrine and aspirin.
Important Warnings
- •Dose by body weight (3-6 mg/kg); fixed pre-workout scoops ignore this
- •Doses around 9 mg/kg cause high side-effect incidence without additional performance benefit
- •Sleep disruption undermines the recovery you are training for, set a daily cutoff
- •Additive cardiovascular load with other stimulants and with blood-pressure-raising cycles
- •Abrupt cessation after regular use causes headache and fatigue. Taper instead
Purpose & Use Cases
Training Performance
The best-supported use. The ISSN position stand notes benefits across muscular endurance, movement velocity, muscular strength, sprinting, jumping and throwing, with aerobic endurance showing the most consistent moderate-to-large benefit.
Fat Loss Stacks
The "C" in ECA. Caffeine contributes appetite suppression and thermogenesis, and is combined with ephedrine and aspirin in the classic protocol.
Benefits
- Consistently improves exercise performance at doses of 3-6 mg/kg body mass
- Improves endurance by 2-4% across dozens of studies at those doses
- Benefits span muscular endurance, movement velocity, strength, sprinting, jumping and throwing
- Effective in both trained and untrained individuals
- Supported for endurance exercise in the heat (3-6 mg/kg) and at altitude (4-6 mg/kg)
- Legal, unrestricted and permitted in competition
- Extremely cheap
Good to Know
Dose by body weight, not by scoop
The evidence is built on 3-6 mg/kg body mass. For an 80kg lifter that is roughly 240-480mg. Pre-workout products are sold in fixed scoops that ignore body weight entirely, which is how people end up either under-dosed or well past the point of diminishing returns.
More is not better past 6 mg/kg
Very high doses such as 9 mg/kg produce a high incidence of side effects and do not appear necessary for the ergogenic effect. The performance ceiling arrives well before the side-effect ceiling does.
The sleep trade is usually a losing one
With a 3-7 hour half-life and wide genetic variability in clearance, late dosing costs sleep quality. For anyone whose goal is recovery and growth, systematically trading sleep for a marginally better session is a bad exchange.
It is the C in ECA
The classic ephedrine-caffeine-aspirin fat-loss stack requires all three. Caffeine contributes thermogenesis and appetite suppression alongside ephedrine's adrenergic effect.
Dosage Guidelines
| Experience Level | Dosage Range |
|---|---|
| Beginner | 100 – 200 mg/day |
| Intermediate | 200 – 400 mg/day |
| Advanced | 400 – 600 mg/day |
The evidence-based dose is body-weight-scaled rather than fixed: 3-6 mg/kg body mass is the range shown to improve performance, which works out to roughly 240-480mg for an 80kg lifter. The fixed milligram ranges above are that scaling expressed for a typical adult. Minimal effective doses may be as low as 2 mg/kg. Going higher is not better. Very high doses such as 9 mg/kg are associated with a high incidence of side effects and do not appear to be required for the ergogenic effect. Tolerance to the subjective stimulant effect develops with daily use, and periodic deloads are common practice for that reason though not formally established as necessary.
Half-life varies substantially with genetics (CYP1A2 activity), smoking status, oral contraceptive use and pregnancy. This variability is why the same afternoon dose ruins one person's sleep and not another's, and sleep disruption is the main way caffeine can quietly cost you more than it gives.
Side Effects
Sleep disruption
very commonThe most consequential effect by far, and the most underestimated. With a half-life of 3-7 hours, an afternoon dose is still meaningfully present at bedtime. Poor sleep degrades recovery, training quality and hormonal health, which can easily cost more than the pre-workout gained.
Set a daily cutoff time, commonly 8-10 hours before bed. Reduce total daily intake.
Anxiety / jitteriness
commonDose-dependent, and worse when combined with other stimulants such as ephedrine or yohimbine.
Reduce dose. Be especially careful with stacked stimulants.
Elevated heart rate and blood pressure
commonMeaningful in this population specifically, because AAS cycles already elevate blood pressure and hematocrit. Stacking stimulants on top compounds the cardiovascular load.
Monitor blood pressure on-cycle. Reduce stimulant load when running compounds that raise it.
Tolerance and withdrawal
very commonRegular use produces tolerance to the subjective effects; abrupt cessation commonly causes headache and fatigue for several days.
Taper rather than stopping abruptly.
GI upset
uncommonStomach discomfort, particularly on an empty stomach at higher doses.
Take with food.
General Mitigation Strategies
Caffeine is safe at ordinary doses for most adults; the practical issues are sleep disruption and cardiovascular load. The sleep point deserves emphasis in this context. Anyone running a cycle is trying to maximise recovery, and dosing caffeine late systematically undermines that. The cardiovascular point matters when stimulants are stacked on top of compounds already raising blood pressure. Very high doses add side effects without adding performance.
Post Cycle Therapy (PCT)
No HPT axis interaction. No PCT implications.
How It Works
Caffeine antagonises adenosine receptors in the central nervous system, blocking the accumulating signal of fatigue and reducing perceived exertion. This lowers the subjective cost of a given effort, allowing more work at the same perceived intensity. It also increases catecholamine release, which underlies its thermogenic and lipolytic contribution in fat-loss stacks. It has no hormonal or anabolic action.
Hormonal & Androgenic Profile
N/A: not an androgen.
Not a hormonal compound.
Acutely raises heart rate and blood pressure. Additive with other stimulants and with the blood pressure elevation caused by AAS cycles. The combination is where the real risk sits, not caffeine alone.
Fundamentals
Reference on the practices relevant to Caffeine: how they are done and where they go wrong. Not a recommendation to use it.
Common Stacks
- Caffeine + Ephedrine + Aspirin: the classic ECA fat-loss stack
- Caffeine 3-6 mg/kg taken 60 minutes pre-training
- Watch total stimulant load when combining with clenbuterol or yohimbine on-cycle
Legal Status
Unrestricted and available in food, beverages and supplements worldwide. Not on the WADA Prohibited List: caffeine was removed from it and is permitted in competition.
Legal status varies by country and changes over time. This is a general summary, not legal advice.
WADA Status
Caffeine is not on the WADA Prohibited List and is permitted in competition.