Pre-workout

What it is

A pre-workout is a mixed-ingredient powder taken before training, promising energy, focus and "pumps". It's less a single supplement than a bundle — and the bundle's value depends entirely on what's in it and at what dose.

What the evidence shows

The proven ingredients. Well-supported· human data Most of a good pre-workout's real effect comes from ingredients that work in their own right: caffeine (the bulk of the kick), beta-alanine for repeated high-intensity efforts, and citrulline as a modest maybe. The benefit is those ingredients, not the brand.

Proprietary blends and the long extra ingredient list. Marketing claim Many products bury effective ingredients in an underdosed "proprietary blend" and pad the label with extras that have little or no evidence. A big ingredient list is not the same as a big effect.

Focus/nootropic and "explosive" claims. Preliminary· human data Mostly down to the caffeine; the rest is largely unproven at the doses used.

Who it suits

People who like the convenience and ritual of a pre-workout and choose one with transparent, sensible doses of the proven ingredients — not those chasing the proprietary-blend hype.

Practical notes

Read the safety box: most of the punch is caffeine, often in high doses, so mind your total daily intake and timing (our caffeine calculator helps). You can replicate a good pre-workout by buying the evidence-based ingredients separately and controlling the doses.

Sources

• PubMed: multi-ingredient pre-workout supplements — performance evidence and ingredient dosing