divi 100ml Scalp Serum - brand new sealed Divi’s award-winning, clinically tested Scalp Serum goes beyond a traditional hair serum to focus on a healthy scalp environment, not just existing hair. In fact, in an independent study over 12 weeks of daily use, 90% of participants noticed an improvement in the look of fullness of their hair and 87% of participants noticed an increase in how dense their hair looked. With amino acids, caffeine, peptides and rosemary oil, our serum designed for thinning hair works to reduce product and oil buildup and promote a clean, healthy environment for your best hair.