One reason why they say not to use aphogee besides the protein is because of the pH of the product. Going very acidic constricts the cuticle, making it less flexible. The product is very acidic and without proper balancing and again depending on the base line of your hair and how many cuticle layers it has, using it every week might not be a good option. Its part of the general formula. This is also why other treatments that have comparable effects of aphogee can be used more frequently on damaged hair like emergencee and dudleys DRC. You can use those weekly on extremely damaged hair until you don't need it anymore and if your hair is severly damaged or your cuticle layer is just all kinds of messed up, using aphogee every 4 weeks for a couple of months might be a better option for you.