Easy to weave into your haircare routine, reach for the Redken Acidic Grow Full System Hair Serum 100ml & Redken Acidic Grow Full System Instant Densifying Spray Duo. Made with azelaic acid and a densifying complex, the two-piece strives to volumise hair, rebalance the scalp and reduce the appearance of breakage. Set Contents: Redken Acidic Grow Full System Hair Serum for Thin Hair, Strengthens & Thickens 100ml A pH-balanced, no-rinse formula that helps to improve the look of fragile strands while lending a dose of nourishment to the scalp. Redken Acidic Grow Full System Instant Densifying Spray for Thin Hair, Strengthens & Thickens 200ml A pH-balanced, leave-in formula that noticeably lifts roots in seconds, creating a plumped-up, weightless result.