Is cayenne pepper OK for ultimate cleanse even though I'm type A blood?

Hi! I have followed the Blood Type Diet for a while now...It has worked wonders for me. I'm type A blood and according to the diet cayenne pepper has a negative affect on me. Can I replace it with anything else? Like ginger or garlic?
Also, I've fasted many times before and am going to do a 40 day fast this time. Is it Ok to do the ultimate fast for this long? And shoud I do the liver cleanse at the end of the 40 days? Thanks so much!