Paused · Down, Down, Stream
PerformanceLimited evidence
Mixes built around caffeine, often with beta-alanine and other extras. Most of the effect comes from the caffeine.

Pre-workouts are powder blends taken before training. Most are built around caffeine, often with beta-alanine, citrulline and other extras.
Most of the effect comes from the caffeine. The rest is often under-dosed or hidden in a blend, which is why the evidence for the mix as a whole is limited.
That is usually the beta-alanine. It is harmless and fades.
The caffeine can keep you awake for hours, so evening sessions are a good reason to choose a caffeine-free one or skip it.
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