Improve the health of your hair with Living Proof Perfect Hair Day (PhD) Shampoo, an innovative cleanser that helps you to wash your locks less often. Powered by the brand’s own Healthy Hair Molecule to smooth the cuticle and protect strands against damage, the nourishing shampoo expertly lifts away dirt and excess oil to leave behind a fresh and clean feel. Expect healthier-looking results, both instantly and over time. Safe for coloured and chemically-treated hair. Free from parabens, silicones and phthalates. Cruelty-free.