The Necessary™ | Care For Your Body™ | Care For Your Planet™ Treat Your Scalp Like Your Skin™.  The Scalp Duo is a 2-step clinical system for scalp and hair health. The Shampoo and The Conditioner are infused with Hyaluronic Acid, Vitamin B3, Vitamin B5 and ApiScalp to balance a dry, sensitive scalp and support follicle health. No Sulfates. No Phthalates. No Parabens. No PEGs. No Silicones. Color-safe. Keratin-Safe. Fragrance-Free.  Both formulas hold The Seal of Approval by The National Eczema Association. 2 x Full-Size. Clinical Perception Study | The Hair Essentials. 50+ participants used The Shampoo, The Conditioner and The Scalp Serum for 90 days. USA 2022. Topline below. 90% Saw Thicker Hair 94% Saw Fuller Hair 96% Saw Healthier Hair