The pre-workout market is one of the most confusing in supplementation — labels full of flashy ingredients, dosages hidden in “proprietary blends” and promises that are difficult to verify. This article separates real-evidence ingredients from filler ingredients and shows you what to look for when choosing or putting together your pre-workout.
What pre-workout should do
Direct answer: An effective pre-workout must provide, in proven doses, ingredients that improve acute performance (caffeine for alertness and reduction of perception of effort; citrulline for vasodilation and muscular endurance) and/or cumulative (beta-alanine for capacity for prolonged intense effort; creatine for strength and power). Secondary ingredients can contribute, but without the main ingredients in the right dose, the product has limited value.
Ingredients with strong evidence
Caffeine — the key ingredient
- Effective dose: 3 to 6 mg/kg body weight (200 to 600 mg in most cases)
- Mechanism: adenosine receptor antagonist; increases alertness, reduces perception of effort, mobilizes fat
- Best use: 30 to 45 minutes before training
- Evidence: Robust meta-analyses for strength, power, endurance and cognition
Important variables:
- Genetics (fast vs slow metabolizers)
- Acquired tolerance
- Time of day (caffeine at night can harm sleep)
Beta-alanine — for muscular endurance
- Effective dose: 3 to 5 g/day continuously (6 to 10 weeks to saturate)
- Mechanism: increases muscle carnosine; improves H+ buffering capacity
- Best in: efforts of 60 to 240 seconds (long series, circuits, medium duration modalities)
- Effect: improves performance by 2 to 4% in these ranges
Typical side effect: paresthesia (tingling) that passes in 15–30 min, harmless.
Citrulline malate — for multiple series
- Effective dose: 6 to 8 g of citrulline malate (or 4 to 6 g of pure L-citrulline)
- Mechanism: arginine precursor; increases NO (nitric oxide) and blood flow
- Effect: improves performance in multiple sets of the same exercise (more reps in final sets)
- Evidence: consistent in acute studies
Caution: many pre-workouts contain 2 to 3 g (underdose).
Creatine monohydrate — the basis of any supplementation
- Effective dose: 3 to 5 g/day continuously
- Can be in pre-workout or consumed separately
- Doesn’t depend on timing (pre, post, fasting — whatever)
- Evidence: the most robust among all ergogenic supplements
Ingredients with moderate evidence
Taurine
- Dose: 1 to 2 g
- Effect: antioxidant, possible improvement in resistance and hydration
- Evidence: moderate and mixed
Tyrosine
- Dose: 1 to 3 g
- Effect: dopamine/noradrenaline precursor; May improve cognition under stress
- Evidence: moderate, useful in specific situations (tactical sports, high cognitive demand)
Betaine
- Dose: 2.5 g/day (chronic)
- Effect: possible improvement in strength and power; inconsistent evidence
- Evidence: moderate to weak
Caffeine + L-theanine (combination)
- Dose: 200 mg caffeine + 100–200 mg theanine
- Effect: reduces caffeine jittery, keeping you alert
- Evidence: good for cognition; benefit in physical performance is secondary
Weak evidence or marketing ingredients
Arginine isolated
- It is usually “sold” for the same role as citrulline
- Bioavailability is lower; citrulline generates more arginine in plasma than direct oral arginine
- Typical pre-workout doses (2 to 3 g) are insufficient
AAKG (Arginine alpha-ketoglutarate)
- Weak evidence
- 2000s fashion
Yohimbine
- Some effects on fat mobilization
- Risk of anxiety, tachycardia
- Low benefit/risk ratio for general pre-workout
”Proprietary Blend”
- Total sum of ingredients listed without individual dose
- Opaque label by design
- Typically hides underdosing of main ingredients
- Avoid whenever possible
Low dose amino acids (BCAA/EAA 2–3 g)
- Subtherapeutic dose
- Label filling
How to read pre-workout label
- Check specific dose per ingredient (not proprietary blend)
- Compare with doses of evidence from the table above
- Caffeine must be expressed in mg
- Beta-alanine in 3 to 5 g; below that is underdose
- Citrulline in 6 to 8 g; below that too
- “Exotic” ingredients (plant extracts, mixtures) are often marketed
Homemade vs commercial pre-workout
Homemade (minimum functional)
- Caffeine: 1 cup of strong coffee (~150 mg) + 1 200 mg tablet for a person weighing 80 kg
- Beta-alanine: 3 g (sachet or powder)
- Creatine: 5 g (daily dose, can be pre-workout)
Cost: low. Efficacy: high. Disadvantage: less practical.
Commercial (well formulated)
Look for: caffeine ≥200 mg, beta-alanine 3–5 g, citrulline 6–8 g, possibly creatine 3–5 g.
Cost: intermediate to high. Efficacy: high if well formulated.
Dose and practical timing
| Ingredient | Dose | Timing |
|---|---|---|
| Caffeine | 3–6 mg/kg | 30–45 min antes |
| Beta-Alanine | 3–5 g/dia | Anytime; chronic |
| Citrulline | 6–8 g | 30–60 min antes |
| Creatine | 3–5 g/dia | Anytime; continuous |
| Taurine | 1–2 g | 20–30 min antes |
When NOT to take pre-workout
- At night (caffeine compromises sleep)
- On days without training (unnecessary)
- Pregnancy, lactation, uncontrolled hypertension (be careful with caffeine)
- Individual sensitivity to stimulants
- Before very short or light workouts (low return)
Strategy to maximize long-term effect
Cycle caffeine
- 8 weeks using, 2 weeks with reduced dose (or break)
- Maintains sensitivity
- Alternatively, “caffeine-free” days once a week
Continuous Beta-Alanine
- No need to cycle
- Effect persists as long as there is supplementation
Continuous creatine
- Always daily, does not cycle
Common mistakes
Buying pre-workout with expensive proprietary blend. Most of the price goes to marketing.
Caffeine every day in a high dose. Quick tolerance, effect drops.
Pre-workout shortly before training. Caffeine needs 30–45 min to peak.
Underdose of beta-alanine and citrulline. Ingredients only take effect in the right dose.
Expect acute effect of beta-alanine. Requires 6 to 10 weeks for saturation.
Ignore hydration. Pre-workout does not replace water.
Tips used by personal trainers
- For beginners: strong coffee + daily creatine is 90% of the benefit of any commercial pre-workout
- Those who train at night should avoid caffeine or reduce it a lot; theanine can help
- Ethical recommendation: transparent about dose and evidence of each ingredient; avoid selling “magic” pre-workout
- Deficit athlete may benefit more from caffeine due to its effect on alertness and effort capacity
- “If the pre-workout doesn’t have caffeine in dose and beta-alanine + citrulline, it’s filler” — useful initial filter
Key Takeaway Points
- Caffeine, beta-alanine, citrulline and creatine are the core ingredients with evidence
- Doses matter: caffeine 3–6 mg/kg, beta-alanine 3–5 g/day, citrulline 6–8 g
- Proprietary blend hides underdosage of the main ones; avoid
- Homemade pre-workout (coffee + beta-alanine + creatine) delivers maximum efficiency
- Cycling caffeine maintains sensitivity over time
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