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The Density Preserving Scalp Drops from Philip Kingsley contain an innovative active complex designed to help maintain follicle condition and protect hair density and quality over time*. The synergistic complex within this clinically tested, lightweight serum provides an instant feeling of stimulation and improves hair condition to help prolong the hair’s life cycle, reduce scalp visibility, and slow hair loss with continued use. Dermatologically tested. Suitable for sensitive skin. *when used for three months continuously