Anything that has mucopolysaccharides. Last year I read abt the growth promoting benefits of mps and purposely started buying products with them and my hair began drying out and becoming brittle. When I used aloe vera gel my hair texture completely changed. It lost its natural curl pattern and was a weird dry kind of feeling. When I started taking msm internally my 4a/b hair started growing in 4zz. I stopped and then started on it again thinking it may have been smthin else and the same results. Anything I use w mps changes the texture, look and feel of my hair. Why? Could I b allergic?