The evidence is convergent. Multiple independent sources reach the same conclusion, the underlying mechanism is well-characterized, and even the field's most cautious voices treat it as worth doing.
For somebody who's caffeine adapted and is used to drinking caffeine, it won't have that vasoconstriction effect, that's what the data point too, because I'm adapted to it but it will cause vasodilation and will allow me to dump body heat.
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Native comments, Twitter mentions, and Reddit threads about this claim — surfaced together so the conversation isn't fragmented across platforms.
Bookmarking — the dossier-vs-overview split is the right call. Most of the time I want overview; sometimes I want receipts.
Would love a "what would change this verdict" RSS feed. Sign me up if it exists.
If you enjoy caffeine before your workouts and you're accustomed to caffeine, meaning you drink it three or five times or more a week. 100 to 300 milligrams this is a typical daily dose of caffeine. Some of you are ingesting more, some less. If you do that regularly, well, then it's going to be just fine to ingest caffeine before you train.
If you're caffeine adapted however, there's this kind of interesting phenomenon where ingestion of caffeine serves more as a performance enhancer, both by increasing alertness, but also by way of dilating vasculature of allowing more blood flow.
I notice more the general alertness, but it's probably hard to to separate those. I think we see more performance benefits if you go from being, you know, caffeine naive, and I am not. Um, I'm very habituated at this point, so I'm probably not seeing that many performance benefits, but yeah, I definitely feel it when I don't have caffeine pre-workout.