Caffeine is a heart-healthy habit — EurekAlert!
Caffeine improves systemic lupus erythematosus endothelial dysfunction by promoting endothelial progenitor cells survival — Rheumatology
How Much Caffeine Is In a Cup of Coffee? — Food Network
How much caffeine is in tea? — GoodFood
Personally, I find staying away from salt a straw-man for lower BP and heart health.
More important is eliminating added sugars and keeping daily carb intake low.
I now add salt, plenty of it, and drink caffeinated tea daily, with a resulting average to low BP.