I never have trouble with wheat protein. But soy protein and products with keratin high on the list are a death wish. My curls are limp and straighten out and sometimes my hair looks just full and flat. I used Wen with soy and it took a day for my curls to disappear. It's not high on the list and my hair was shiny and straight. Keratin just does the build up look. So did a gel that had protein high on the list. But when I switch to the other Wens my hair goes back to normal. Weird.