Pre-workout supplements: what really works (and what is marketing)

Creator: Renzy
Published: 2026-07-05
Keywords: pre-workout supplements, pre workout, caffeine pre-workout, beta-alanine, citrulline malate, best pre-workout, which pre-workout to take

Renzy

July 5, 2026 · 12 min read

Medically reviewed by Renzy

Pre-workout supplements: what really works (and what is marketing) — pre-workout supplements

Quick answer

Of everything sold as a "pre-workout", only a few ingredients have solid evidence. The two kings: CAFFEINE (improves strength, power and endurance; 3-6 mg per kg about 30-60 min before) and CREATINE (the most studied supplement for strength and muscle, though you take it daily, not just before training). With smaller but real evidence: beta-alanine (helps in intense efforts of 1-4 minutes, but needs weeks of loading and causes tingling) and citrulline (a possible aid to muscular endurance and less soreness). The rest — "pump" blends, arginine, exotic ingredients — is mostly marketing. You do not need a commercial tub: caffeine + creatine cover almost all the benefit. Go deeper in the creatine guide and the evidence-based supplements guide.

The pre-workout shelf is one of the most profitable — and most inflated — in any supplement store. Colorful tubs with aggressive names, "proprietary blends" that never say how much of each thing they contain and promises of energy and "pump" that rarely deliver. The good news is that sports science is fairly clear about which ingredients genuinely help performance and which only decorate the label. This guide separates what works (little, but real) from what is pure marketing, with practical doses and safety warnings.

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What a pre-workout is and why almost all of them disappoint

A "pre-workout" is any supplement you take before training in search of more energy, strength or endurance. The problem is that most commercial tubs mix a dozen ingredients into "proprietary formulas" that never reveal how much of each they contain: that way they hide whether the things that actually work (like caffeine) are properly dosed, while padding the label with flashy but unsupported ingredients. The result is that you pay dearly for a long label when only two or three things do the work.

Caffeine: the one that really works

If you could only take one pre-workout, it would be caffeine. It is the most studied and reliable ergogenic aid: the official ISSN position (Guest et al., 2021) confirms it improves strength, power and endurance in almost every sport. The useful dose is 3-6 mg per kilo of bodyweight, about 30-60 minutes before training. You do not need a colorful tub: a strong coffee or an anhydrous caffeine tablet does exactly the same. The one important warning is sleep: caffeine has a long half-life, so avoid high doses in the late afternoon or evening so you do not sabotage your rest, which is when you actually recover (see how sleep affects your body).

Creatine: the king (even if it is not "pre")

Creatine deserves a place on this list even though it is technically not a pre-workout: it works by accumulating in the muscle, so what matters is taking it every day (3-5 g of monohydrate), not right before. It is by far the supplement with the most evidence and the best safety profile for gaining strength and muscle (Kreider et al., ISSN 2017). You do not need a loading phase or expensive brands: basic monohydrate is the most studied and the cheapest. The full guide is in the complete creatine guide.

Beta-alanine: for short, intense efforts

Beta-alanine helps in one very specific context: high-intensity efforts lasting between 1 and 4 minutes, like long sets to failure or repeated sprints. Per the ISSN (Trexler et al., 2015), it buffers the acidity that builds up in the muscle and delays fatigue in that range. It has two quirks: it needs "loading" (3-6 g a day for 2-4 weeks to saturate the muscle; it does not work on day one) and it causes a tingling in the face and hands that is scary the first time but completely harmless. Outside that effort range, it contributes little.

Citrulline: the "pump" with some basis

Citrulline malate is one of the few "pump" ingredients with some backing. At doses of 6-8 g before training it increases nitric oxide and, according to studies like Perez-Guisado and Jakeman (2010), may somewhat improve muscular endurance and reduce soreness. The evidence is modest and not always consistent, so treat it as an optional extra, not a must. And forget arginine for the same purpose: it is poorly absorbed and performs worse than citrulline.

What does NOT work (or barely)

A good part of what fills commercial pre-workout labels has no solid evidence:

Arginine: poor absorption, worse than citrulline for the "pump".
Proprietary blends: they hide the doses and usually underdose the good stuff.
Trendy exotic ingredients: lots of marketing, little science behind them.
"Energizing" doses of B vitamins: they do not improve performance unless you have a deficiency.

How to build your pre-workout without overspending

The recipe with the best evidence-to-price ratio is simple: caffeine before training (coffee or a tablet) + creatine daily. If you do intense 1-4 minute efforts, add beta-alanine; if you feel like trying the "pump", citrulline. That is all. Buying those ingredients separately costs a fraction of a commercial tub and you know exactly what you are taking and how much. The IOC consensus on supplements (Maughan et al., 2018) points exactly that way: few with evidence, known doses, and healthy distrust of miracle formulas.

What matters more than any supplement

No pre-workout makes up for a bad training program, short sleep or missing your protein. Supplements are the icing, not the cake: they add a small extra percentage on top of a solid base. Before spending on tubs, make sure you train with progressive overload, sleep 7-9 hours and eat according to your goal — whether that is body recomposition or a bulking or cutting phase. With that base, caffeine and creatine add up; without it, no supplement works miracles.

The supplements that work have to be taken consistently — creatine every day, beta-alanine for weeks — and that is where memory fails. In the Wellness section of Renzy you can log your supplements and the app reminds you to take them and tracks your adherence, so that consistency, which is what delivers results, does not depend on remembering.

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Key takeaways

1From the pre-workout shelf, only a few ingredients work: caffeine and creatine are the kings.
2Caffeine: 3-6 mg/kg, 30-60 min before, for strength, power and endurance — do not overdo it late in the day or you will harm your sleep.
3Creatine: 3-5 g daily (not just before), the supplement with the most evidence for strength and muscle.
4Beta-alanine (intense 1-4 min efforts, weeks of loading) and citrulline (modest help) are optional extras.
5Commercial tubs with "proprietary blends" are usually marketing: buy the ingredients that work separately.
6No supplement replaces training well, sleeping and eating your protein: that decides the result.

Frequently asked questions

Which pre-workout supplement actually works?▼

Caffeine and creatine are the two with the most evidence. The official ISSN position on caffeine (Guest et al., 2021) confirms it improves strength, power and endurance. Creatine (Kreider et al., ISSN 2017) is the most studied supplement for gaining strength and muscle. Beta-alanine and citrulline help less and in specific contexts. The remaining ingredients in most commercial pre-workouts lack solid backing.

How much caffeine should I take before training?▼

Between 3 and 6 mg per kilo of bodyweight, about 30-60 minutes before. For 70 kg that is 210-420 mg (an espresso has ~80-100 mg). You do not need an expensive tub: coffee or anhydrous caffeine tablets work the same. Avoid high doses in the late afternoon or evening so you do not wreck your sleep, which is key to recovery. See [[how-much-caffeine-per-day-is-healthy|how much caffeine per day is healthy]].

Does beta-alanine work? Why does it cause tingling?▼

Yes, but only for high-intensity efforts lasting between 1 and 4 minutes (long sets, repeated sprints). Per the ISSN position (Trexler et al., 2015), it buffers muscle acidity and delays fatigue. It needs "loading": 3-6 g a day for 2-4 weeks to saturate the muscle; it does not work on day one. The tingling in the face and hands (paresthesia) is a harmless, passing effect.

What about citrulline and the "pump" effect?▼

Citrulline malate (6-8 g before training) increases nitric oxide and may somewhat improve muscular endurance and reduce soreness, though the evidence is modest and not unanimous. The "pump" (the swollen-muscle feeling) is real but temporary and does not necessarily translate into more muscle. Arginine, heavily sold for the same purpose, is poorly absorbed and works worse than citrulline.

Do I need a commercial pre-workout?▼

No. Almost all the benefit comes from caffeine and creatine, which you can buy separately for much less. Many tubs use "proprietary blends" that do not reveal the real doses of each ingredient, and they tend to underdose what works while loading up on filler. The IOC consensus on supplements (Maughan et al., 2018) recommends prioritizing the few with evidence and distrusting miracle formulas.

Is creatine a pre-workout?▼

Not exactly: creatine works by accumulation, so what matters is taking it every day (3-5 g), not right before training. The time of day makes no difference. It is by far the supplement with the best evidence-to-price ratio for strength and muscle. All the details are in the [[creatine-complete-guide|complete creatine guide]].

Scientific sources

Medical disclaimer

Nutritional information and health calculations in Renzy are for informational purposes only and are based on recognized scientific sources (USDA Food Database, ESPEN, WHO). They do not replace professional advice from a qualified doctor, nutritionist, or dietitian. Always consult a health professional before changing your diet or following medical recommendations.

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