I don't know which ingredient it was... but a few months back alot of ladies had problems with excessivly dry skin and scalp...so bad that they got redness-itching and skin peeling. If you decide to surge make sure you keep your hair moisturized and maybe increase the number of times you wash your hair to make sure the product doesn't stay on your scalp too long and irritate your skin.
I think Boadicea was one of the people who had problems with Surge. You might PM her.
Good Luck