Grow Long Scalp & Hair Serum: This anti-breakage Scalp & Hair Serum from Marc Anthony promotes hair length by strengthening hair fibers at the root, creating a great foundation for stronger, longer growing hair. Does not grow new hair. 2 fl oz. Long Hair, Don’t Care: Formulated to help you achieve those perfect lengths without limits, our Grow Long collection features moisturizing, anti-breakage formulas blended with Caffeine and Ginseng for stronger, longer, healthier looking hair.