Redken
Acidic Grow Full System Scalp & Hair Serum

Acidic Grow Full System Scalp & Hair Serum is rated 4.2 out of 5 by 128.

Preview image 1 of Acidic Grow Full System Scalp & Hair Serum

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 4 out of 5 by Analaura from 10/10 This product is amazing. The smell is great and I’ve seen a huge difference since using it.

Date published: 2026-08-23

Rated 5 out of 5 by A1Styles from 10/10 Recommend! Especially for fine hair! I have always suffered from hair shedding and breakage for my fine, thin hair, and felt that all products did were weigh my hair down and not solve the underlying problem. After 4 months of consistent use of this serum, along with the full Acid Grow Series, I can see a significant difference in the density and resistance to my hair. This stuff is a game changer. The product is super lightweight, smells great, and I love that its a sprits top for easy application. I do recommend pairing this serum with the full Acid Grow Series to get TRUE results and understand that consistency/patience is key!

Date published: 2026-08-11

Rated 3 out of 5 by AEL13 from a miss for me not a fan of this. it felt sticky, and i'm not crazy about this type of sprayer compared to a regular pump because it moves around while i'm trying to spray. I tried not to use much but it still felt heavy.

Date published: 2026-08-10

Rated 5 out of 5 by LoLo from Great Product Been using this for about a month now and seeing new growth. I tend to be oily but this does not make my hair oily at all. It actually gives my roots a little lift like I used a dry shampoo but without the white residue

Date published: 2026-06-07

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