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 4 out of 5 by from Body body!! [Employee of saloncentric] Excellent body and fullness great for fine hair and hair needing some extra love.
Date published: 2026-03-21
Rated 5 out of 5 by from Always recommend! I love this line of hair products, my hair was falling out so bad. I knew it was time to get me some! I can always depend on redken, I always recommend and use it again and again!!
Date published: 2026-03-21
Rated 4 out of 5 by from Style looks fuller Felt very similarly to the serum in the finish. Not sure if that's the intention. Made hair look thicker and fuller but also a bit sticky. Will be nice to see overall long term results if there is hair growth from using the system
Date published: 2026-03-20
Rated 3 out of 5 by from It’s okay Overall, I think it would be a great product with the entire line and for someone who was super thin hair. The smell is good. I did feel as if it dried out my hair as well as a couple of clients. As well, it is too soon to tell if that is helping with any hair growth.
Date published: 2026-03-19
Rated 2 out of 5 by from A cosmetic fix, not actually solving thinning The way this product is marketed is misleading. This specific product is STRICLY cosmetic. Your hair will feel thicker, but thays not because it is in fact thicker. So its a great product if you want your hair to feel thicker, but please dont be misled into thinking this product made more of your hair grow. As long as you understand its cosmetic, like using contour to make your face LOOK different doesnt actually change the shape of your face. My hair did feel HUGE from using this product just once, but i also felt like I had to wash it much sooner.
Date published: 2026-03-19
Rated 5 out of 5 by from More hair, please Amazing mist/spray to feel like you instantly have more hair!!! Absolutely love the lasting volume and body this gives me without drying my hair out!
Date published: 2026-03-18
Rated 5 out of 5 by from ⭐️⭐️⭐️⭐️⭐️ ⭐️⭐️⭐️⭐️⭐️ Redken Acidic grow full Instant densifying spray : Has a lovely light crisp scent. Gives hair a a nice shine and perfect for fine to medium hair . My hair feels smoother and stronger after first use . Feels really light as well like nothing in the hair I a good way .
Date published: 2026-03-18
Rated 3 out of 5 by from Ok product Ok product. Gave my hair some volume but also made it feel dry. Too soon to see hair growth. Also couldn’t tell what difference if any there was between this and the serum. Seems like they do the same thing.
Date published: 2026-03-17
Rated 4 out of 5 by from good but not great decent with the whole line but i feel like it made my hair feel dry
Date published: 2026-03-16
Rated 4 out of 5 by from I love acidic bonding line I love regular acidic bonding shampoo and conditioner line so I was really excited to try this densifying spray out. It smells wonderful and does help the hair feel a little more dense. Love that it has a heat protectant in it too. I prefer this over the serum.
Date published: 2026-03-16
Rated 5 out of 5 by from Very great Instant densifying spray this spray is really the spray is really good when it comes to instantly making your hair feel more dense spray nozzle or handle of the spray do not like because I just feel like it's too small for my hands but the spray itself Works fantastic for instantly change to your hair
Date published: 2026-03-16
Rated 3 out of 5 by from Not for fine hair. I received this product as a tester and here’s my honest review. Smells great. It was very heavy on my fine hair.
Date published: 2026-03-16
Rated 3 out of 5 by from It’s okay! I am having a hard time understanding the difference between this and the hair serum. I don’t think both are needed and the bottles sound like they do the same thing. Results are nice but do not over spray on the roots as scalp will feel clogged
Date published: 2026-03-16
Rated 3 out of 5 by from Take it or leave it Client said she didn’t love it but didn’t hate it. Didn’t feel like it did much for her
Date published: 2026-03-16
Rated 5 out of 5 by from Immediate result I got the system for my client who had hair loss due to extreme weight loss. Within the first use, she reported hair felt and looked fuller.
Date published: 2026-03-16
Rated 1 out of 5 by from it’s a no for me I wouldn’t recommend it . It did leave my hair dry
Date published: 2026-03-14
Rated 5 out of 5 by from Love this line I received this product for free for my honest review I love this spray and the whole line. My fine hair has never looked better!! This stuff has not only made my scalp feel amazing but my hair fuller feeling.
Date published: 2026-03-14
Rated 1 out of 5 by from Disappointed I was very disappointed in this product. I didn’t feel like it did anything for my very fine thin hair. Left my hair feeling dry
Date published: 2026-03-14
Rated 5 out of 5 by from Great Really loved the densifying spray. Easy application and loved the way the bottle locks. I could tell immediately after using it made a difference in my hair. I believe with the rest of the system it really did make a difference in the density.
Date published: 2026-03-13
Rated 4 out of 5 by from Heat protection & root boost! I love the fresh scent and how this provides both heat protection and an added root boost. I received this gift from Redken in exchange for an honest review.
Date published: 2026-03-13
Rated 5 out of 5 by from Great applicator bottle This grow full system is great, easy to apply with handy spray bottles to help direct right where you want it to go. Smells clean easy to apply and does make my hair feel denser. I am looking forward to see over time how much this helps with thickening up hair.
Date published: 2026-03-13
Rated 4 out of 5 by from Good This was my least favorite product from this line but did make my hair feel thicker
Date published: 2026-03-13
Rated 5 out of 5 by from Acidic grow full system instant densifying spray This product has helped my thin, fine hair feel thicker and stronger since I've started using it. I have recently been going through a lot of hormonal changes and loosing quiet a bit of hair but since using this system it seems that the shedding has slowed down a lot. My hair has been feeling thicker and stronger. Thank you Redken!
Date published: 2026-03-12
Rated 3 out of 5 by from This left my scalp dry and my hair very difficult to brush through
Date published: 2026-03-12
Rated 5 out of 5 by from Love this whole line! This whole line of acidic grow system is fantastic! It leaves the hair feeling super clean and the smell is great. I did notice that my hair felt more dense after using. I recommend this to many of my clients now.
Date published: 2026-03-12
Rated 5 out of 5 by from I like it I used this serum as part of the acidic system. I really like this it made my hair feel nice and soft while also hydrating my scalp while giving the hair a lot of body and movement.
Date published: 2026-03-12
Rated 4 out of 5 by from Just ok. Not amazing for super fine hair. Not in love but still in the early stages of trying and forming an opinion. Leave in sprays are tricky. I don’t love it on myself as I have finer hair but it gives a nice bounce to those with medium thickness.
Date published: 2026-03-11
Rated 5 out of 5 by from Love it!! Love this whole acidic grow line. I'm glad to have this whole system. Smells clean easy to apply and does make my hair feel denser. My hair is growing from previous chemo treatments and I feel my hair is thin in the back of my head and I started using this whole line a Acidic grow full system hoping to make my hair feel fuller and with this spray it does. I wish I would have had it sooner I will continue to use this whole line of products definitely recommend.
Date published: 2026-03-11
Rated 4 out of 5 by from Thicker hair This whole line is unique in color, smell and use. I only used it about 1 week before writing this review and found my hair felt a lot thicker. The smell was almost a manly smell, but was quite nice. The color of the bottles make them stand out and are very pretty.
Date published: 2026-03-11
Rated 4 out of 5 by from Thicker Hair For Sure! I was super excited to receive this product line because I had one specific client in mind when it arrived. She is suffering from some situational alopecia due to anesthesia. I was intrigued with this scalp mist but the directions were unclear if was to also be used with the scalp spray serum. So I did end up using both together along with the shampoo/conditioner. I definitely saw the fullness it added to the hair and each strand was visibly thicker. For this client's fine hair, I may have sprayed too much and/or using them together may have been too heavy on her hair, as the blowdry was a bit difficult and left the hair feeling a bit crunchy at the roots, it was still brushable though. I will try again with less product or only using 1 or the 2 sprays.
Date published: 2026-03-11
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