I think it depends on how much hair u have. I used a little over an ounce. The main thing is make sure to rinse it fully out and dont rinse protein out with cold water (cold water will lock it in, this is best for moisturizing conditioners). I rinse for a full 5 minutes which is what was suggested in a hair book I read....that way I can be sure its all out. and be sure to follow up with a moisturizing conditioner to bring back your hairs moisture and counteract any dryness caused by the protein. Im sure it will be fine, I dont see why stylists claim only they should do protein treatments bc its not much different than any other treatment. Just a way to make more money! They charge a lot for each treatment too! I have this conditioner and plan to use it in a week, Im overdue for one and had some breakage this touch up so its time!