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 Impressed Makes hair feel noticeably thicker and adds a lot of volume
Date published: 2026-04-27
Rated 5 out of 5 by from love! I use this along with the scalp serum and it leaves you with full, clean feeling hair. A MUST for fine haired girlies or anyone struggling with excess shedding or density issues.
Date published: 2026-04-27
Rated 1 out of 5 by from Broke my hair need to return No for me I have hilighted fine hair and this broke my hair and I used very little. Yes volume but made my hair feel brittle n my hands would get stuck in it. Couldn't run my hands through it
Date published: 2026-04-27
Rated 3 out of 5 by from Gives thickness but leaves itchy scalp Does make the hair feel a little thicker but made my scalp itchy and the hair felt stiff
Date published: 2026-04-24
Rated 5 out of 5 by from Great Product! Fantastic density! It really feels like your hair is thicker and does not weigh the hair down.
Date published: 2026-04-22
Rated 5 out of 5 by from Game changer I absolutely LOVE the new Densifying spray. It’s light weight yet gives fine bar an extra boost in feeling fuller and thicker. It also adds body to limp hair. I would highly recommend for any client with fine hair!
Date published: 2026-04-19
Rated 5 out of 5 by from Volume I am impressed with the immediate volume I received after blow drying.
Date published: 2026-04-09
Rated 4 out of 5 by from Good Volumizing spray Thanks to Salon Centric review crew I was able to try out this spray. This is very similar to a volumizing spray with the added benefit of being able to spray it directly on the scalp for volume at the roots. It is very similar to a leave in conditioner but with the added benefit of adding volume to the hair.
Date published: 2026-04-02
Rated 5 out of 5 by from mind blown 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 serum!
Date published: 2026-03-31
Rated 5 out of 5 by from Great product Great product. It really helps with thickening and growing my hair. Doesn’t leave any stiffness on hair
Date published: 2026-03-31
Rated 4 out of 5 by from Great products. 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. Her only complaint was she felt it made her hair feel greasy the next morning.
Date published: 2026-03-31
Rated 4 out of 5 by from Nice! Great scent! Not sure I can really tell more hair growth. Giving 4 because whole it does feel “thicker” 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 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 2 out of 5 by from Not worth it I wanted to like this densifying spray. Giving it 2 stars because I liked the scent. I did not like how my hair felt after applying the product and drying my hair. It just felt dirty and gross like I hadn’t washed in like a week. Was not a fan. Thanks to bzzagent for the product for review.
Date published: 2026-03-27
Rated 4 out of 5 by from Who loves thicker feeling hair ? Scent smells fresh.This made my hair feel somewhat thicker but,I also use this in conjunction with the serum.I love the whole line but,would love it better without so many steps.I sometimes dont have the time.
Date published: 2026-03-27
Rated 5 out of 5 by from I like the line I really like the smell and lift it offers. I haven’t been using it long enough to know that it’s working for sure, but I like the product line
Date published: 2026-03-27
Rated 5 out of 5 by from Great product I love this product! It reminds me of a thinner version of thickening lotion. Which I like better! So much easier to apply.
Date published: 2026-03-26
Rated 3 out of 5 by from Just Ok Cant really give a solid review of this yet as I dont see the results yet. But overall its really light and I like the fragrance.
Date published: 2026-03-26
Rated 4 out of 5 by from Love it after glp-1 hair shed I received this product complimentary in exchange for an honest review. Redken's new densifying spray is a surprise! I usually avoid products like this because my hair texture is coarse and I'm usually left feeling greasy and weighed down. This spray does offer volume, lift and texture. I feel it fairly lives up to its claims. My husband enjoys using it for styling. On his short haircut it performs like a salt spray. I'm enjoying this full line from redken.
Date published: 2026-03-26
Rated 5 out of 5 by from Love Smells amazing. Clients see noticeable difference using the entire system.
Date published: 2026-03-26
Rated 5 out of 5 by from Smells great and doesn't weigh down the hair. Roots are full with more volume nearly instantly! Doesn't make roots oily like some other root lifters.
Date published: 2026-03-26
Rated 4 out of 5 by from Seems to work I have only ever used this product in conjunction with the serum it’s meant to be paired with so it’s hard to speak on the product by itself. I do feel like I felt thickening of my hair. Be careful with the amount used bc when over done it is visible in the hair as a bit of a crunchy look. It can be mostly brushed out in that case though. The scent of this whole system is pleasant. I haven’t used any of the products long enough to determine if my hair is growing differently.
Date published: 2026-03-24
Rated 3 out of 5 by from Unclear I don't particularly love the way this product sprays, I would prefer a softer mist like the serum. Hair does appear fuller but also feels slightly dry. Instructions are not clear since the website says to "apply mid-lengths to ends" but the bottle instructs you to spray directly on scalp and comb through.
Date published: 2026-03-24
Rated 4 out of 5 by from Love A true multitasker. This treatment delivers hydration, strength, heat protection, frizz control, and more—all while supporting longer, healthier hair. It’s an easy add-on for clients who want maximum results with minimal effort.
Date published: 2026-03-24
Rated 5 out of 5 by from In love Ever since I went blonde I have felt my hair on the thinner side but since I stated to use this I feel it gives my hair so much body love it
Date published: 2026-03-24
Rated 5 out of 5 by from Added Texture for Fine Hair This thin hair booster is awesome. I used it in addition to the rest of the Acidic Grow Full System. It provided extra lift and texture to fine/flat hair. I did notice added weight or heaviness when using this product. Spray it sparingly prior to heat styling for the biggest volume boost.
Date published: 2026-03-23
Rated 4 out of 5 by from Good for specific hair types This is a good styling product for those with thin hair. It is not for everyone, though everyone can benefit from the heat protectant that this product carries. The applicator spray is great and evenly distributes. Gives those with finer hair a bit of volume.
Date published: 2026-03-23
Rated 3 out of 5 by from Just ok. I received the Redken acidic full grow system for free as part of a campaign in return for reviews. I was excited to try this on my dry thin limp hair. I feel it is just OK. While the densifying spray did create a fuller texture I did not love the way it left the hair feeling. I don’t care for products I can feel in my hair. Took away softness. I can’t say I would recommend.
Date published: 2026-03-23
Rated 5 out of 5 by from Awesome system I’ve really enjoyed using the Acidic Grow Full System. I have used this product for close to two months now. Even from the first few uses, I have noticed my hair feels stronger and healthier. All the products have left my hair feeling soft and not heavily weighed down. I would highly recommend this full system to clients wanting to repair, strengthen, and grow their hair.
Date published: 2026-03-23
Rated 5 out of 5 by from Actually works! Love the fullness this spray gives my hair. It does work best when used with a blow dryer. My hair felt soft and was shiny unlike most volume products. It has a nice scent and definitely made my hair look fuller. The heat protection is a nice plus
Date published: 2026-03-22
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