Pre-workout supplements: what works, what is theatre

The pre-workout tub is fitness marketing's loudest product: neon powder, aggressive branding, and an ingredient list that reads like a chemistry exam. Audited honestly, most tubs contain one or two proven ingredients at effective doses, several at fairy-dusting levels, and a fair amount of sensation engineered to feel like efficacy.

What actually has the evidence

Caffeine is the whole show: performance benefits across endurance and strength are among the most replicated in sports science, at roughly 3–6mg per kg of body weight, taken 30–60 minutes before. A typical scoop delivers 150–300mg — a large coffee to a strong one. That means the honest version of pre-workout is often a coffee plus change. The caffeine guide covers the individual variation and the sleep math that caps the dose. Citrulline malate (6–8g) has genuine support for high-rep endurance and reduced soreness; creatine works — but as a daily supplement, not a pre-workout one, and the creatine guide covers it properly. Beta-alanine helps efforts of one to four minutes specifically, with the famous tingles being a harmless side effect doing a lot of marketing work.

The theatre layer

Several ingredients exist mainly to be felt rather than to perform: high-dose niacin flushes, tingle-inducing compounds, stimulants that raise heart rate so the product announces itself. Feeling altered is not evidence of training benefit — it is evidence of a dose of something. The structural problem is the proprietary blend: a total weight for a mix without per-ingredient amounts, which makes under-dosing invisible and is why independent testing of pre-workouts routinely finds label drift. The supplements audit applies its general rule here: if the label won't tell you the dose, assume there isn't one.

The honest verdict

For most trainees the effective stack is boring and cheap: caffeine from coffee or tablets, dosed sensibly and never near bedtime; creatine monohydrate daily if you want it at all; food as fuel, per the pre-workout eating guide, which matters more than any powder. If a tub still appeals, read it as a label audit: named doses for citrulline and caffeine, no proprietary blends, and a stimulant level you can sleep over. What no pre-workout fixes is the thing that actually limits sessions — under-recovery and under-fuelling — which is why the best-performing pre-workout in every study remains the unmarketable one: sleep, breakfast and a plan.

Sources

• WHO — Physical activity (fact sheet)
• CDC — Physical Activity Basics

Every link checked 2026-09-25; sources favour primary and public-health bodies.