If you can stand the taste of it – people seem to either love it or hate it – licorice tea is thought to suppress the effects of aldoterone, which is a hormone that regulates the way the body handles salt. If you hope to raise your blood pressure with licorice tea, aim for 30 grams or more per day over a period of four weeks and then get tested to see if you’ve moved the needle. Licorice in any form is not recommended for people with high blood pressure, but if yours is low, it’ll take a lot to push it to a dangerously high level.
Caffeine is a stimulant that can temporarily boost your blood pressure, though medical professionals aren’t entirely sure how. One idea is that it narrows arteries by blocking a certain hormone. Others think that caffeine causes the body to release more adrenaline, which also raises blood pressure. In any case, the effects are strongest in people who don’t regularly consume caffeine, so you may want to reduce your overall caffeine intake in order to have it as a tool for managing blood pressure crashes.