Redken
Acidic Grow Full System Instant Densifying Spray

Acidic Grow Full System Instant Densifying Spray is rated 4.1 out of 5 by 107.
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Acidic Grow Full System Instant Densifying Spray
Preview image 1 of Acidic Grow Full System Instant Densifying Spray
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6.8 oz.
#P2869900
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What It Is

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

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

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.

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Rated 5 out of 5 by from Fuller look I loved this product. I used it on its own and it was wonderful. Just as wonderful with the rest of the set! Pick it up! I have fine thin hair. Fluffed me right up.
Date published: 2026-03-10
Rated 5 out of 5 by from Good spray Sprays out really nice. When used in conjunction. With the rest of this line, it works well. Gives the hair good volume.
Date published: 2026-03-10
Rated 4 out of 5 by from Slowly working Been using this for a little over 2 weeks. Though I haven't mucus results yet , I do feel as though it is slowly doing its job. I will continue to use product and see how far this will take my hair in new regrowth.
Date published: 2026-03-10
Rated 5 out of 5 by from Great for heat styling Amazing product for heat styling hair. I can get a great blowout using this product.
Date published: 2026-03-09
Rated 2 out of 5 by from No go It doesn’t do it for me. I feel like my hair just felt dirty and gross after using. We tried using a couple of times and it just didn’t work at all.
Date published: 2026-03-09
Rated 4 out of 5 by from Great for men & women I love the spray nozzle on the Redken Acidic Grow Full System Instant Densifying Spray. It makes the application easy and mess free. The product is good, but may not work all hair types. The pro of this product is it offers heat protection up to 450 degrees, which is great if you are going to heat style your hair after application. Not so great if you wanted to let hair air dry or left natural. Starting to use on my boyfriend to improve volume on his thin hair. Since it is a spray bottle he is more willing to use this product compared to others.
Date published: 2026-03-09
Rated 3 out of 5 by from Not as dense as I was hoping I received this product free for my honest review. As always a fan of Redkin products. I put this product in my hair after using the shampoo and conditioner. I let my hair air dry. I did not feel that it made my hair feel more dense. Believe this might be a product that needs heat to really activate it. Will try again and blow dry my hair after. Friends however said my hair looked thick.
Date published: 2026-03-08
Rated 4 out of 5 by from Volume & Heat protection Redken sent me this free sample through the BzzAgent sampling program. I liked thus volume spray. It works very well with this full Redken line. I also had tried it on its own without the matching shampoo/ conditioner, and it still provides results but just not as intense. The only thing that kind of don't care for, just like with the serum product this line has, is how you must dry your hair within a short time after applying it. If not, it will leave your hair crunchy as if you put mousse in it. So if you prefer air drying your hair, you may not like this. However, when you do blow dry it leaves hair very voluminous. The added bonus of this spray is that it does offer heat protection up to 450, which is great because you do need to blow dry in order to get the best results.
Date published: 2026-03-08
Rated 5 out of 5 by from Loved it. Loved this treatment and could see myself using it continually. Noticed volume in my styling and more fullness with further use and would recommend it.
Date published: 2026-03-08
Rated 3 out of 5 by from Decent Wanted to love this system but its just not it for me. The Acidic Grow Full System Instant Densifying Spray left my hair feeling coated. With claims of fullness and so much more, I had high hopes. I did notice decent volume, but I think the spray serum that goes with this line works against it and so the volume didnt last for me.
Date published: 2026-03-08
Rated 4 out of 5 by from Great product This is the last step in this system, and while it smells nice, it did leave my ends a little dry. But overall it's good. Using this with the whole system helps my hair feel more fuller.
Date published: 2026-03-08
Rated 4 out of 5 by from Volume! Hair feels fuller without a super gritty feel which I love!
Date published: 2026-03-07
Rated 5 out of 5 by from Amazing Volume That Lasts 5 stars! This spray works great for volume and fullness. It gives my clients with thinner hair a fuller, thicker look without feeling sticky or heavy. What really stands out is how well it works with the full system. When I use this along with the shampoo, conditioner and scalp serum, the results are amazing and long lasting which is hard to achieve with other lines. The hair feels soft, lifted and more voluminous, and the effect holds up really well. Definitely worth using and it is a superior product!
Date published: 2026-03-06
Rated 5 out of 5 by from The density spray works well with the system The densifying spray is the perfect addition to the 4 part system. It makes the hair look full. It smells like heaven. It definitely helps with the density of the hair.
Date published: 2026-03-06
Rated 3 out of 5 by from Good for fine hair and fullness This spray is great if used on fine hair. Fine hair feels more full, but feels a bit rough. it's great to hold volume and as a heat protector, but as someone with curly hair, I would pass on using this
Date published: 2026-03-06
Rated 2 out of 5 by from Not a fan of this one didn’t love this one. It made my hair feel extremely crunchy and like I did not just wash it.
Date published: 2026-03-06
Rated 5 out of 5 by from Made my hair look thicker Redken sent me this free sample through the Bzzagent sampling program in exchange for my honest review. I spray this 6 inches from my scalp on damp hair before styling and it really works well! It made my fine lifeless hair look full and healthy. It felt and looked thicker and appeared more nourished. The nozzle is easy to use and has a wide spray that makes spraying larger sections of my scalp and hair a breeze. It doesn’t take too much time to use and it is easy to incorporate into my morning hair care routine.
Date published: 2026-03-05
Rated 5 out of 5 by from Great product This is a great product. I would recommend for anyone with fine hair.
Date published: 2026-03-04
Rated 3 out of 5 by from Not a fan of this one Not 100% sure about the way this makes my hair feel. Maybe I used too much? It made my hair feel dirty and it was not easy to comb through. I do like that there’s heat protection built in.
Date published: 2026-03-04
Rated 4 out of 5 by from Gives volume; spray is too strong This product def gives fine hair some added volume!!! I have over processed, fine, short hair & when used with the whole line this as the last step before drying def adds a boost. The smell is refreshing and light! The only thing is the spray on this is somewhat aggressive; it sprays like a dart rather than a mist and feels like excessive product which in turn can feel somewhat gritty on the hair when it’s dried. This is why I removed a star, aside from that I like the product.
Date published: 2026-03-03
Rated 4 out of 5 by from We will see Started using this in place of a leave in conditioner. I feel like I like the texture of my hair after using, but not sure how much it is helping with density. Excited to see after using longer.
Date published: 2026-03-03
Rated 2 out of 5 by from Ehhhh Not loving! I enjoy the shampoo and conditioner, and also the scalp and hair serum but this product leaves my hair feeling like I just sprayed texture spray on wet hair.. not sure how else to describe it. Redken has better product options.
Date published: 2026-03-02
Rated 2 out of 5 by from Not a fan of this product Im not a huge fan of this product. I have fine hair and I didn’t use an excessive amount yet if felt yucky on my hair. My hair felt so soft after the shampoo and conditioner then after I added this product and blow dried it, it just felt dirty. My hair feels silky and shiny when I use just the shampoo and conditioner from this line. I did receive this product in exchange for this review.
Date published: 2026-03-02
Rated 4 out of 5 by from Love it for thickening, not so much as a heat protectant. It makes my hair feel thicker and once it’s blow dried it feels so nice and silky
Date published: 2026-03-02
Rated 3 out of 5 by from Meh This product is just average to me. I really hate the smell and I hate the buildup that it leaves on the hair after it's dry
Date published: 2026-03-01
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