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.<br/>Serum: After rinsing conditioner, on damp hair, spray onto the roots. Use fingers to massage into scalp. Do not rinse. Style as usual. Spray: On damp hair, mist directly onto scalp by parting hair. Mist at least 6 inches away from the scalp. Work product through hair with a comb. Do not rinse. Style as usual.