Here's my 2 cents.
Caffeine is a vasoconstrictor. If you have high blood pressure then I would recommend that you find something without caffeine in it to drink after a workout. When you work out your blood pressure increases, add caffeine on top of it and for someone with high blood pressure this could get dangerous for your heart.
Caffeine is often use in diet pills because it increases the metabolism. This is temporary though so if you use them to loose weight and then go back to your normal regime you will gain the weight back quite quickly once your metabolism returns to normal.
If you aren't using it for diet purposes, you don't have high blood pressure, this could be just fine. Caffeine does contribute to your body producing more endorphines so if you get sore after a workout you may not feel it quite as much after drinking the coffee because the endorphines block the pain receptors. The effect is quite mild so unless you drink a lot of coffee you probably won't really notice a difference.
I found
this site informative. Look at how coffee/caffeine works in your body and make your own decision if it's helpful or hurtful.
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