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But caffeine is a net vasodilator.

[–] 0 pt

I don't think so. Caffeine is a vasoconstrictor. That is why it raises blood pressure.

https://endurelite.com/blogs/free-nutrition-supplement-and-training-articles-for-runners-and-cyclists/does-caffeine-decrease-blood-flow

It doesn't have to be a vasoconstrictor to raise blood pressure if it is stimulating the heart to pump harder or faster.