After reading several research papers stating that procyanidin can promote hair growth, I wanted to give it a try. Since apple polyphenols contain procyanidin, I ordered apple polyphenol extract. Unfortunately, I had very adverse reactions like histamine sensitivity, increased hair loss, and body rashes from just one dose. My food sensitivity from April revealed that I was very slightly allergic to apple (almost normal). This makes me wonder if there is an ingredient or metabolism mechanism of polyphenol that is not suitable for my body. Is polyphenol metabolized by our body in a special manner? Phenols do not have sulfur, which is one element I have huge trouble with (http://phenol-explorer.eu/compounds). I am not sure why I had such negative reactions. Has anybody tried this and experienced something similar? Please share your experience. Thank you.