Redken Acidic Growth Full System Hair Serum for Thin Hair, Strengthens & Thickens 100ml

Redken Acidic Growth Full System Hair Serum for Thin Hair is a lightweight leave-in treatment designed to support fuller-looking, denser hair. Powered by azelaic acid, caffeine and a 5% hydrating complex, the formula helps to rebalance the scalp’s pH while delivering targeted moisture to both scalp and hair. The serum works to smooth the appearance of fragile strands and supports hair that’s prone to breakage, helping it feel stronger, softer and more resilient over time. Suitable for all hair types, it’s particularly well suited to thin or flat hair that needs extra body and care.

Used after shampoo and conditioner, this serum fits easily into an everyday haircare routine. Simply spray onto damp roots and massage into the scalp to encourage even distribution. The non-greasy texture absorbs quickly without weighing hair down, so hair can be styled as usual. With regular use, the serum helps to promote the look of thicker, fuller hair while maintaining a comfortable, hydrated-feeling scalp.

Why we love it
- Lightweight leave-in serum that helps hair look fuller and denser without feeling heavy or greasy
- Formulated with azelaic acid, caffeine and a hydrating complex to support a balanced, comfortable-feeling scalp
- Designed for thin or flat hair that’s prone to breakage, helping strands feel stronger and smoother
- Easy to slot into an existing routine, applied to damp roots after washing and left in before styling as usual

How to use
How to Use:
After washing hair and rinsing out conditioner, gently towel-dry so hair is damp. Spray the serum directly onto the roots and scalp. Massage with fingertips to distribute evenly. Do not rinse and style hair as usual.

Frequency:
Use daily or as part of your regular haircare routine, according to the product instructions.

Application Technique:
Hold the spray close to the scalp and apply in sections to ensure good coverage, focusing on areas where hair feels thin or fragile. Massage in small circular motions to help the lightweight formula absorb without disturbing your style.

Best Practices:
Apply to clean hair and scalp for best cosmetic results. Avoid over-saturating lengths to keep the hair feeling light. Allow the serum to settle before using additional styling products or heat tools.

Safety Tips:
For external use only. Avoid contact with eyes; if this occurs, rinse immediately with plenty of water. Discontinue use if irritation occurs and keep out of reach of children. Always follow any additional guidance on the product packaging.

Aqua / Water / Eau, Glycerin, Hydroxyethylpiperazine Ethane Sulfonic Acid, Caffeine, Peg-40 Hydrogenated Castor Oil, Sodium Hyaluronate, Phenoxyethanol, Citric Acid, Bifida Ferment Lysate, Saccharomyces/Rice Ferment Filtrate, Chlorphenesin, Propylene Glycol, Parfum / Fragrance, Tetrasodium Glutamate Diacetate, Pentylene Glycol, Azelaic Acid, Linalyl Acetate, Carvone, Linalool, Limonene, Citrus Limon Peel Oil, Citrus Aurantium Bergamia Peel Oil, Sodium Benzoate, Citral, Citrus Aurantium Peel Oil, Pinene

How to Use:\nAfter washing hair and rinsing out conditioner, gently towel-dry so hair is damp. Spray the serum directly onto the roots and scalp. Massage with fingertips to distribute evenly. Do not rinse and style hair as usual.\n\nFrequency:\nUse daily or as part of your regular haircare routine, according to the product instructions.\n\nApplication Technique:\nHold the spray close to the scalp and apply in sections to ensure good coverage, focusing on areas where hair feels thin or fragile. Massage in small circular motions to help the lightweight formula absorb without disturbing your style.\n\nBest Practices:\nApply to clean hair and scalp for best cosmetic results. Avoid over-saturating lengths to keep the hair feeling light. Allow the serum to settle before using additional styling products or heat tools.\n\nSafety Tips:\nFor external use only. Avoid contact with eyes; if this occurs, rinse immediately with plenty of water. Discontinue use if irritation occurs and keep out of reach of children. Always

- Lightweight leave-in serum that helps hair look fuller and denser without feeling heavy or greasy\n- Formulated with azelaic acid, caffeine and a hydrating complex to support a balanced, comfortable-feeling scalp\n- Designed for thin or flat hair that’s prone to breakage, helping strands feel stronger and smoother\n- Easy to slot into an existing routine, applied to damp roots after washing and left in before styling as usual