PURA D'OR Hair Thinning Therapy Energizing Scalp Serum 4oz is an intense treatment that nourishes the scalp and strengthens hair. Exclusive formula delivers 15 key active ingredients specifically developed to maximize the results of the Hair Thinning Therapy system. Caffeine, Catalase, and Cayenne invigorate the scalp, while Apple Fruit Stem Cell and Pea Protein Extract increase hydration and help protect strands from future damage. Free from harsh chemicals, environmentally responsible, hypo-allergenic, vegan and cruelty free.