If you're unfamiliar with them, here's a little info on how they work. Protein treatments are specialized conditioners meant to fortify and rebuild the structure of the hair. Your hair is mostly made from protein and when it becomes stressed from styling, chemicals--yes, hair coloring counts--and aging, some of that protein is lost, creating gaps along the hair shaft. These weak spots are sensitive to breakage, which can create a challenge if you're trying to grow your hair out. What protein treatments do is fill these gaps just like concrete on a cracked sidewalk to increase hair's strength and structure.
If your hair is fairly healthy, try incorporating a protein treatment in after a wash at least once a week. But if you have chemically-treated hair or hair that is prone to breakage due to genetics, health deficiencies, etc., then you want to up it by throwing one in every-other to every wash.
glo essentials Reparative Keratin Leave-In Treatment