Believe it or not, I am a type A, and I have used as much as two tablespoons of cayenne in one day to a gallon of lemon-maple syrup water for the Master Cleanse, and I feel terrific when I am doing that fast. But I don't know much about the Blood Type Diet . I know some foods do not agree with me or make me tired. I don't know if that is food allergies , or just something I shouldn't eat because of the makeup of my blood. A little cayenne shouldn't hurt anyone unless you are severely allergic, I would think. I use the 90,000 heat unit stuff that I buy in bulk.