Our hair changes as we get older - it's just biology. We've formulated products designed to work with our unique hair biology, for women who know that spirit and confidence don't stop as we get older, and neither should beautiful hair. Hair Biology Strengthening Treatment Spray strengthens your color-treated or grey hair to protect against breakage caused by combing and heat. Free of parabens and dyes and safe for color-treated grey hair. Infused with Biotin. Reduces hair loss caused by styling. Discover the complete line of age-inspired hair care products from Hair Biology and fall in love with your hair again.