Redken
Acidic Grow Full System Instant Densifying Spray

Acidic Grow Full System Instant Densifying Spray is rated 4.1 out of 5 by 106.

Preview image 1 of Acidic Grow Full System Instant Densifying Spray

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6.8 oz.

#P2869900

Redken Acidic Grow Full System Instant Densifying Spray for thin hair is a lightweight formula that delivers an immediate volumizing effect, visibly improving the look of hair density for thin or flat hair with heat protection up to 450°F.

What It Does

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

• Fuller-looking hair with instant densifying effect

• Heat protection for styling safety

• Ideal for thin or flat hair

• Maintains color-treated hair integrity

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

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 six inches away from hair, on clean, damp hair. Comb through from mid-sections to ends.

AQUA / WATER / EAU • ALCOHOL DENAT. • PVP • CAFFEINE • PEG-40 HYDROGENATED CASTOR OIL • PROPYLENE GLYCOL • TRIETHANOLAMINE • PHENOXYETHANOL • ACRYLATES/BEHENETH-25 METHACRYLATE COPOLYMER • PARFUM / FRAGRANCE • CAPRYLYL GLYCOL • AZELAIC ACID • BIFIDA FERMENT LYSATE • SACCHAROMYCES/RICE FERMENT FILTRATE • LINALYL ACETATE • CARVONE • LINALOOL • LIMONENE • CITRUS LIMON PEEL OIL • PENTYLENE GLYCOL • CITRUS AURANTIUM BERGAMIA PEEL OIL • CITRAL • CITRUS AURANTIUM PEEL OIL • PINENE • GERANIOL • TERPINEOL • GERANYL ACETATE • CITRONELLOL • EUCALYPTUS GLOBULUS OIL • MENTHA PIPERITA OIL • SODIUM BENZOATE

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 Marlo from Noticeable Volume Without Sticky Build-Up I usually avoid thickening sprays because they leave my fine hair feeling sticky or stiff, but this one gave me noticeable fullness without weighing my hair down. It added volume while still keeping my hair soft and touchable, and it layered really well with the rest of the line.

Date published: 2026-05-31

Rated 4 out of 5 by Camryn from Spray bottle I love this product and how it makes my hair feel so full after blowdrying it! I am giving it 4 stars because the bottle will no longer allow me to spray product out. I know on the instructions it says to run under hot water after each use and I have done that. I ended up putting it in a different spray bottle for now but I’m wondering if they will be able to fix this eventually. Other than that I absolutely love this whole line!

Date published: 2026-05-12

Rated 5 out of 5 by MarissaMKEstylist from Amazing Densifying Spray! This product is fantastic for fine or thinning hair! Immediately after drying the hair, I can tell the difference; and my clients can too! You just need to be careful of using too much because it can make the hair feel stiff. I’d definitely recommend this to friends! I received this product for free in exchange for my honest opinion.

Date published: 2026-04-29

Rated 5 out of 5 by Jess from pretty dramatic results So far so good. The first 3 clients I tried this on bought this product along with the serum and intend to add on to get the full system. It extends my style by 2 more days and I can tell a difference. Immediately

Date published: 2026-04-28

Rated 4 out of 5 by Chrissy from Something new It’s nice that they finally came up with a product that’s meant to strengthen the hair really been struggling with my fine hair clients and it was refreshing to get something new

Date published: 2026-04-28

Rated 5 out of 5 by Christina from Fantastic product! The difference when using the spray is absolutely incredible! It’s almost like I have a new head of hair!

Date published: 2026-04-28

Rated 4 out of 5 by Jhair1 from Impressed Makes hair feel noticeably thicker and adds a lot of volume

Date published: 2026-04-27