Redken Acidic Grow Scalp & Hair Serum 3.4 fl oz — Lightweight Azelaic Acid Serum for Rebalanced Scalp and Instant Root Lift

Redken Acidic Grow Full System Scalp & Hair Serum is a lightweight, leave-in scalp and hair treatment that helps rebalance scalp pH and supports the appearance of fuller, thicker-looking hair with a 5% Strength Complex.

This daily serum combines azelaic acid with Redken’s 5% Strength Complex in a non-greasy formula designed to hydrate the scalp, provide instant root lift, and visibly plump hair when used as part of the Acidic Grow Full System. Clinically tested with GLP-1 users as part of the complete system, the serum can be applied to either clean, damp hair or dry hair for quick absorption and comfortable wear throughout the day.

How does this serum rebalance and hydrate my scalp?

The serum uses an acidic pH profile and targeted actives to help restore a balanced scalp environment while delivering lightweight moisture. It absorbs rapidly without leaving residue, so you get a refreshed scalp feel and less weighed-down hair.

• Formulated to rebalance scalp pH for a comfortable, hydrated feel
• Lightweight, fast-absorbing texture suitable for daily use
• Can be applied to dry scalp or clean, towel-dried hair

Will this make my hair look thicker, and how soon will I notice a difference?

When used as part of the Acidic Grow Full System (shampoo, conditioner, serum, and densifying spray), many users report visibly fuller-looking hair and instant root lift after application. The serum contributes to the appearance of denser hair by adding moisture, lift at the roots, and a weightless feel.

• Instant lift at roots for immediate fuller appearance
• Part of a four-step system for best visible results
• Tested with GLP-1 users in consumer studies of the full system

What are the key ingredients and is it safe for daily use?

The core active is azelaic acid paired with Redken’s 5% Strength Complex in a lightweight base that’s meant for everyday application. The formula is designed to be non-greasy and suitable for repeated use, helping maintain a balanced scalp environment and manage texture without heavy buildup.

• Azelaic acid for targeted scalp care
• 5% Strength Complex to support hair density appearance
• Daily-use friendly, non-oily finish

How should I use the serum for best results?

Apply the serum directly to scalp areas of concern on either clean, damp hair or dry hair, then distribute lightly from roots to mid-lengths where needed. For optimal visible improvement, pair the serum with the full Acidic Grow system: shampoo, conditioner, and the instant densifying spray.

• Apply daily to scalp; massage in gently for even coverage
• Use on dry hair or towel-dried hair after shampoo and conditioner
• Combine with the Full System for tested results in consumer studies

Who is this for: Redken Acidic Grow Full System Scalp & Hair Serum is intended for people seeking a lightweight, leave-in scalp treatment that targets scalp pH and the appearance of fuller hair. It’s suitable for those experiencing early thinning or reduced hair density looking for a non-greasy product to add to a daily routine, and it was evaluated in testing that included GLP-1 users as part of the complete Acidic Grow regimen.