The Necessary™ | Care For Your Body™ | Care For Your Planet™ Treat Your Scalp Like Your Skin™. The Scalp Serum (60 Day Supply) is a clinical 5% Capixyl™ serum for visibly thicker, fuller, healthier hair. 1% Hyaluronic Acid hydrates a dry scalp, while Vitamin B3 | B5 | ApiScalp supports the scalp's protective barrier. The Scalp Serum has been awarded The Seal of Acceptance by The National Eczema Association. No Alcohol. No Phthalates. No Parabens. No PEGs. No Silicones. No Synthetic Fragrance. Color-Safe. Water-Light. Non-Sticky. Non-Greasy. No Residue. 30-Day Supply.