I can tell you some that my dear departed Mom gave to my hubby and I that we tried and regretted! Like, mixing black powder with water and applying to poison ivy. Yeah, never again, and if anyone ever tells you that vicks salve is good for hemorrhoids, just go ahead and smack them and get it over with!
But, crushed cayenne pepper in vinegar taken once a day will control blood pressure, but so does a much more palatable banana/pineapple/honey/yogurt smoothie.