I’ve read that the ethnic Xhosa people in our country have figured out how to use coumarin-containing plants medicinally
The trick lies in decocting a crushed infusion of flowers and simmering water many times over until the base reduction is as gooey and conform as possible, then making a tincture with only enough liquid to cover 3/4ths of a human thumb nail. If the dosage is just marginally higher than this, serious intoxication can occur, and sometimes, even death