Hyland’s Leg Cramp Relief contains chinchona officinalis. It really works for the leg cramps, but i don’t know how much quinine you get.
Looks like you can get a pure decoction of chinchona bark on Amazon for 18.99 the little dropper bottle.
Again no way to tell how much you’re getting so I’d be cautious about exceeding the recommended dose.
thanx for the tips