Redken Acidic Grow Scalp & Hair Serum 1.5 fl oz — Lightweight Leave-In, pH-Balanced for Fuller-Looking Hair

Redken Acidic Grow Full System Scalp & Hair Serum is a lightweight, leave-in treatment that rebalances scalp pH while adding moisture to help hair look fuller and thicker.

This concentrated 1.5 fl oz serum is designed to integrate into a scalp-care routine, using Redken’s 5% Strength Complex to hydrate the scalp and create conditions that support denser-looking hair. The formula is pH balanced and meant to be left in—no rinsing—so it layers easily under styling products and fits into daily grooming. The texture is featherlight, absorbing quickly without weighing down fine or thinning hair.

How does this serum rebalance my scalp and why does pH matter?

The serum is formulated to restore a balanced scalp environment, which helps the skin feel comfortable and hydrated. A balanced pH supports the scalp’s natural surface, helping reduce dryness and maintaining healthier-looking hair roots without harsh stripping.

• pH-balanced formula that avoids alkalinity that can dry the scalp
• Lightweight hydration to prevent flaking and tightness
• Designed for daily leave-in use—no rinse required

What ingredients are responsible for thicker-looking hair?

Redken’s Acidic Grow Full System features a 5% Strength Complex including azelaic acid derivatives to help clarify and support the scalp surface. These actives work alongside hydrating agents to improve the appearance of density and fullness over time.

• 5% Strength Complex formulated for scalp care and fuller-looking hair
• Azelaic acid–related component to help refine scalp texture
• Moisture-boosting agents to lift and plump individual strands

How do I use the serum in my routine for best results?

Use the leave-in serum on dry or towel-dried scalp, applying directly to the roots where you want added density and comfort. Massage gently to distribute; do not rinse. Follow with your usual styling products—its lightweight feel layers well without greasiness.

• Apply daily to targeted scalp areas or all over for general care
• Massage until absorbed; no rinsing needed
• Compatible with styling products and other Redken treatments

Will this weigh my hair down or cause build-up?

The serum is formulated to be lightweight and fast-absorbing to avoid heaviness on fine, medium, or thicker hair types. Because it’s pH balanced and leaves minimal residue, routine cleansing removes any residual product without stripping needed moisture.

• Featherlight texture minimizes weighing down hair
• Leave-in design absorbs quickly for natural movement
• Regular shampooing clears build-up while preserving hydration

Who is this for? Redken Acidic Grow Full System Scalp & Hair Serum suits anyone seeking to improve scalp comfort and the appearance of hair density—especially those with fine, thinning, or moisture-depleted hair who want a non-greasy, daily leave-in. It’s a smart pick if you prefer clinical-feeling, salon-grade scalp care that integrates with standard styling routines. Avoid use if you have known sensitivity to any listed active ingredients; consult a professional for personalized guidance.