RedkenAcidic Grow Full System Hair Serum for Thin Hair
Product Description
Target thin or flat hair with the Redken Acidic Grow Full System Serum, a pH-balanced serum designed to leave thicker-looking hair and scientifically proven to reduce hair fall due to breakage from brushing.
Powered by AZELAIC ACID + 5% Hydrating Complex, this lightweight scalp and hair serum delivers:
•\tFuller-looking and thicker-looking hair
•\tA rebalanced, hydrated scalp
•\tStrengthening benefits that lead to up to 2x less breakage*
*high repetition, instrumental brushing test vs classical shampoo on bleached hair
Part of the NEW Acidic Grow Full System of shampoo, conditioner, serum, and spray, which works to rebalance the scalp with hydration and instantly creates denser-looking hair. The system helps create the look and feel of fuller, denser hair by coating the hair fiber and reducing breakage while hair grows as usual.
Powered by AZELAIC ACID + 5% Hydrating Complex, this lightweight scalp and hair serum delivers:
•\tFuller-looking and thicker-looking hair
•\tA rebalanced, hydrated scalp
•\tStrengthening benefits that lead to up to 2x less breakage*
*high repetition, instrumental brushing test vs classical shampoo on bleached hair
Part of the NEW Acidic Grow Full System of shampoo, conditioner, serum, and spray, which works to rebalance the scalp with hydration and instantly creates denser-looking hair. The system helps create the look and feel of fuller, denser hair by coating the hair fiber and reducing breakage while hair grows as usual.
Directions
After rinsing conditioner, on damp hair, spray onto the roots. Use fingers to massage into scalp. Do not rinse. Style as usual.
Ingredients
1400547RK5 - INGREDIENTS: 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 (F.I.L. N70058696/3).
This list of ingredients may be subject to change, please consult the packaging of the product purchased.
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Rated 5 out of
5
by
CarlyMc444 from
Small but mighty!
[This review was collected as part of a promotion.] I’ve really enjoyed using this hair serum spray. The spray bottle has made it easy to apply, the size appears small but such a little goes a long way I have found! My hair snaps often and using this product regularly has really helped to improve my hair health and I’ve found my hair to appear thicker now because I am suffering from far less breakages. I will be continuing to use this product so I can see the long term effects, as I’m really excited to see what it will do for me. So far only positive reviews from me!
Date published: 2026-06-10
Rated 5 out of
5
by
Mayra10 from
Healthy scalp
[This review was collected as part of a promotion.] Is the perfect combination of products one after another. This serum is what my scalp needs and the sensation after is amazing. Healthy scalp is what I need but not every time you get it but in this case with this serum you get healthy scalp with all the benefits of the ingredients used in it
Date published: 2026-06-10
Rated 5 out of
5
by
Alina3 from
Light scalp care
[This review was collected as part of a promotion.] The serum has a lightweight texture and is easy to apply. After almost two weeks of use, it has not caused any irritation, itching, or greasiness, which is a big plus for me. So far, I have not noticed any significant change in hair thickness or density, but it is comfortable to use and leaves my hair looking healthy. I think more time is needed to evaluate the long-term results. I will continue using it and look forward to seeing whether the benefits become more noticeable over time.
Date published: 2026-06-10
Rated 5 out of
5
by
Marli1239 from
Serum for flat thin hair
[This review was collected as part of a promotion.] This Redken serum is my favourite product from a whole range. Not only it’s light and pleasant in use, plus smells really refreshing but it is also works magic to my flat and thin hair. This whole range Truely transformed how my hair looks and not only added a volume but also a confidence.
Date published: 2026-06-10
Rated 5 out of
5
by
ihwets5 from
Really impressed!
[This review was collected as part of a promotion.] I've experienced noticeable results after using this serum within the 4-part range routine for the past week and a half. My hair visibly looks fuller than it has in years, looks shiny, clean and healthy. I have found the products easy to use and very worthwhile. I have even received comments which is amazing for less than 2 weeks use! Would definitely recommend.
Date published: 2026-06-10
Rated 5 out of
5
by
Amber3 from
Redken Acidic Grow Full System Hair Seru
[This review was collected as part of a promotion.] This product was did an awesome job of plumping my hair to get it ready for styling. I love that the applicator as it’s easy to use and doesn’t clog. The packaging is also a bonus.
Date published: 2026-06-10
Rated 2 out of
5
by
BeckysReviewsUK9 from
Spray is wrong dispenser for this
[This review was collected as part of a promotion.] Gifted for free from Home Tester Club.
This product is meant to be rubbed into the scalp which is very hard to do when it’s an aggressive spray pump. Lots of product comes out on each spray meaning you loose so much product to the air. It makes hair hard and greasy so is practically impossible to use.
I have noticed no benefit to my hair other than looking greasy.
Date published: 2026-06-10
Rated 4 out of
5
by
BethL9 from
Redken acidic grow full serum
[This review was collected as part of a promotion.] I was impressed with this treatment. It feels lightweight and doesn’t leave a greasy or crispy residue after drying. A week wasn’t long enough to see a difference in growth but I’m excited to continue to use for longer and see if my hair feels less tone to breakage. Definitely a great addition it’ll you’re trying to grow or strengthen your hair.
Date published: 2026-06-10
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