
Most shampoos contain sulfates that may cause damage to thinning hair. Sulfates are chemicals that make shampoos lather and foam to remove dirt and debris. While sulfates help get your hair squeaky clean, they can also be quite harsh and strip your hair.
If you have thin hair that is also color-treated, shampoos with sulfates may cause even more damage. “Using sulfates on color-treated hair can be too strong and will likely strip the color,” says cosmetic chemist Ginger King.