Redken
Acidic Grow Full System Scalp & Hair Serum

Acidic Grow Full System Scalp & Hair Serum is rated 4.1 out of 5 by 95.

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 Chrissy from Treatment that’s a treat This is a great product to get your clients back in touch with their hair. Easy, small effort with noticeable results.

Date published: 2026-04-04

Rated 2 out of 5 by SassyIrish777 from Made my hair feel crunchy Thank you for Redken for sending me this free sample in exchange for my honest review. I noticed. this product made my hair feel crunchy and dry. I didn’t use it long enough to make an honest review on results.

Date published: 2026-04-02

Rated 4 out of 5 by Natalie from Great for route lifting volume Thanks to Salon Centric review crew I was able to try out this scalp serum. At first I thought this hair serum was to make hair grow like minoxidil does. Then I realized that this is more of a root lift volumizing serum. Kind of wish the description was more direct. It does do a good job at giving you volume at the root.

Date published: 2026-04-02

Rated 5 out of 5 by Mallory from wow wow wow So I have my fair share products I use to make my hair feel and look fuller as well as long-term products to actually grow my hair thicker and fuller. This is all of that in one. All of that and then some! You have to try this in conjunction with the spray!

Date published: 2026-03-31

Rated 4 out of 5 by Heather86 from Great system. I used this product on my daughter who has naturally fine/thin hair. But has also had surgery recently and it made her hair feel so much fuller. I can't wait to see what it feels like over Time.

Date published: 2026-03-31

Rated 4 out of 5 by Pessica from Nice! Great scent! I’m only giving 4 because it’s one more step in this line and one more thing to wash out because you can definitely tell if you add too much product. Wish it was more natural.

Date published: 2026-03-29

Rated 5 out of 5 by Haley from Visibly fuller! Been using for about a month now and it definitely does make my hair feel a little fuller! I like the smell and it doesn't weigh my hair down. Intrigued to keep using to see how my hair will progress.

Date published: 2026-03-28

Rated 5 out of 5 by 412hair from Acidic bonding without being heavy! Leaves hair clean and nourished. Helps create good soil in the scalp to grown new hair! Hopefully will see hair growth with continued use. I shampoo twice a week with the full treatment for reference. I love all of the acidic bonding lines for smoothing my ends but they're a little heavy and I end up washing a day earlier. This one is perfect!

Date published: 2026-03-28