Redken Acidic Grow Full System Densifying Instant Densifying Spray & Hair Serum Duo 200ml + 100ml

The Redken Acidic Grow Full System Densifying Instant Densifying Spray & Hair Serum Duo is a two-step hair treatment designed to help thin, flat hair look fuller, with a lightweight finish. The set pairs an instant leave-in densifying spray with a scalp & hair serum, bringing volume support while targeting breakage from brushing.

For the spray, Redken positions it as an instant root-lifting mist that helps create “fuller-looking” hair in seconds. The serum is a pH-balanced, no-rinse formula that supports the look of fragile strands while also caring for the scalp. Together, they’re part of Redken’s Acidic Grow Full System routine, which focuses on density & strength for fine hair.

Notable ingredients/technologies (where available): azelaic acid is listed for the serum and the spray, alongside “5% strength complex” (serum) and a “5% densifying complex” (spray). The spray also includes caffeine, and both formulas are described as pH balanced. Use the serum on damp or dry hair by applying to the scalp and roots, then mist the spray through mid-lengths to ends (with application kept a distance away from the scalp/hair as directed).