I know I should do protein treatments regularly about every 6 weeks. Sometimes I procrastinate and go a little longer. But is it more important in the summer or winter?
I dont think you have to do pts in certain amount of time. I think you should just do it when your hair seems to be asking for one. I did a pt once because I felt it was time and my hair became like straw because it didnt need it. Now Ive learned to keep my balance better I gave away my pts. I find ro's with protein are enough for my hair.
What I learned this hot/humid NYC summer was that my hair LOVES/NEEDS protein. Also, as long as you follow a protein treatment with a good moisturizing conditioner you will have few problems. But you have to do both.
On the rec of a forum poster, I also occasionally do my protein treatment as a pre-poo, followed by a moisturizing shampoo and then moisturizing conditioner.
Can't say what will happen this winter. But my hair seems to love protein. My hair doesn't behave well without it.