Redken
Acidic Grow Full System Scalp & Hair Serum

Acidic Grow Full System Scalp & Hair Serum is rated 4.3 out of 5 by 119.

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Select Size

3.4 oz.

#E4538600

Redken Acidic Grow Full System Scalp & Hair Serum is a lightweight and formulated with azelaic acid and a 5% strength complex of Caffeine + Prebiotics to rebalance the scalp with moisture, promotingvisibly healthy-looking hair.

What It Does

• Break-free: See the fullness of up to +5,000 hair fibers*

• Scalp is instantly blanced out with moisture

• Delivers instant root-lift for volume

• Provides 2x stronger hair**

• Lightweight and fast-absorbing, non greasy formula and finish

*reduced breakage from brushing with system of shampoo + conditioner + serum + spray vs non-conditioning shampoo

**with system of shampoo + conditioner + serum + spray

What Else You Need to Know

The Acidic Grow Full Density & Strength System provides a healthier feeling scalp that is balanced with moisture* and instantly thicker, fuller looking hair that is 2x stronger**

*shampoo + conditioner + serum + spray vs unwashed hair

** shampoo + conditioner + serum + spray vs non-conditioning shampoo

How To

Spray half an inch away from the scalp on clean, damp hair. Massage into scalp.

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

Return & Refund Policy

Purchases made in SalonCentric stores may be returned to any SalonCentric store. Purchases made through SalonCentric Customer Service, SalonCentric Business Partners, and SalonCentric.com orders Sold and Shipped by SalonCentric may be returned to a SalonCentric store; however, the return must not exceed $450 and must include the original receipt, packing slip, or invoice. For returns in-store of online orders, the refund will be credited back to the original payment method once the return has been processed. For SalonCentric.com Online Exclusive orders sold and shipped by third-party sellers, please see more details linked below for return steps.

The SalonCentric return policy does not currently apply to Kérastase & Shu Uemura purchases. Kérastase & Shu Uemura do not accept returns.

Click to see more details.

Ratings & Reviews

Rated 5 out of 5 by Kosmo by Kris from The Density is REAL!! I was so excited when I saw this line came out! It says 92% of GLP-1 users found using the system made their hair feel denser, and as a guy who's on one myself, I can absolutely agree with that consensus! I use the shampoo, conditioner, scalp serum & density spray, and it's wild how much more hair I feel like I have! Not only does it give me instant results I can see and feel, I love how it's got Azelaic Acid as it's focus ingredient. AA is a known DHT-inhibitor, so in theory, this should be a good option for any male (or female) clients who are needing something to scalp free of the dreaded hormone that causes Androgenic Alopecia. But, only time will tell! 5 Stars All Day Long ⭐⭐⭐⭐⭐

Date published: 2026-06-03

Rated 5 out of 5 by KATT from best new product in a long time! Clients with fugalitis has felt a comfortable scalp. They have had hair loss because of scalp issues. A Dermatologist said it was a good product to use! I really appreciate how the application of this at roots only has caused beautiful fullness and no holding power. It’s fantastic! This is the only product I will use in the Acid Full line… because it reminds me of the Pureology Fulfill Line that was very harsh and short lived. Volume products tend to be soooo drying. Lot of split ends - won’t do that again ….. but the serum is flying out the door!!!!!

Date published: 2026-06-02

Rated 5 out of 5 by Marlo from Lightweight Serum for Fuller Feeling Hair I was nervous this would feel greasy on my fine hair, but it absorbed really nicely without weighing anything down. My hair felt healthier, softer, and a little fuller overall while still staying lightweight. A little goes a long way, and it worked well with the rest of the line.

Date published: 2026-05-31

Rated 5 out of 5 by Rhonda from Amazing new hair growth product Love this product I have been using it on my hair for a few weeks and my hair feels fuller and thicker. I see new growth.

Date published: 2026-05-20

Rated 5 out of 5 by Meghan from Hopeful I was hesitant to try this because a lot of scalp serums irritate my scalp, but I have not had any irritation with this at all. I’m excited to see the results after a few months of use.

Date published: 2026-05-18

Rated 5 out of 5 by Beri from My client told she noticed a difference in her hair after I sprayed it into her hair

Date published: 2026-05-05

Rated 5 out of 5 by shalom from so far so good I’ve used for about 3 consecutive weeks it’s okay not too much of a difference yes but it doesn’t leave it greasy at all

Date published: 2026-04-29

Rated 5 out of 5 by Sarah from MUST HAVE for dry scalp clients! The Scalp & Hair Serum has been a GAME CHANGER for my dry scalp clients. I have clients who 365 days a year, have dry scalp. We have tried EVERYTHING, and things may help a little, but eventually, the dry scalp always comes back. Usually the next day. This baby right here though....spray it on the scalp after shampoo service, rub it into the scalp, brush it through, and your dry scalp is gone! It's been over a month and not a flake in sight! HIGHLY recommend.

Date published: 2026-04-29