Redken
Acidic Grow Full System Scalp & Hair Serum

Acidic Grow Full System Scalp & Hair Serum is rated 4.3 out of 5 by 119.
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Acidic Grow Full System Scalp & Hair Serum
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3.4 oz.
#E4538600
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What It Is

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

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

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 lil root lift too 👀 I’m surprised to be loving this so much. I haven’t used it long enough to say “omg my hair is grown like a weed” but I love that I get a little clean feeling rootlift that helps keep my hair clean for an extra day! Aaaand I can put it in to air dry or style
Date published: 2026-04-29
Rated 5 out of 5 by from obsessed I have personally been sampling and loving this scalp serum along with the density spray in the same line. I no longer use any volumizers or mousse before blow drying my hair. Gives great texture and volume while feeling clean!
Date published: 2026-04-27
Rated 5 out of 5 by from simple steps I got for my boyfriends hair growth journey very simple to use spray and go. 1 week in 🤞
Date published: 2026-04-26
Rated 5 out of 5 by from I loved I loved the item makes smell really nice and soft I like it a lot
Date published: 2026-04-25
Rated 5 out of 5 by from I love how this product works! I cannot tell it is on my scalp because it is so weightless, and I feel my hair has gotten fuller and grown faster since starting it.
Date published: 2026-04-24
Rated 5 out of 5 by from Redken I’ve used this product for a month now I love it so much I’ve seen my hair in a different way now ,nice and healthy ❤️ def would recommend anyone that has hair problems
Date published: 2026-04-20
Rated 5 out of 5 by from feels great I would give probably 4.5 stars. I really like this product, it feels so so good on the scalp and smells so clean I even bought one for my husband, it makes me hair look much fuller, but i can’t speak on it it creates any growth. All in all through it’s become important to my routine.
Date published: 2026-04-20
Rated 5 out of 5 by from It works!! I love this product. It definitely thickens the hair!!
Date published: 2026-04-20
Rated 5 out of 5 by from Excelent product This product makes the hair super thick and fabulous . My clients were almost in diabelieve thst it really helped their hair look and fell thick
Date published: 2026-04-20
Rated 5 out of 5 by from Def my new "go to" for full healthy hair Wow works wonders !! I love redken and have purchase the last 3 new lines they put out. I couldn't wait to come in and try the acidic full products. I colored my hair, used the Acidic Full shampoo and conditioner and applied this product to my roots and massaged in scalp followed with blow dry and my hair looked so full and healthy. I can't wait to wash my hair again and style with this! Highly recommend NOT TO MENTION I got it with the sale price of $15 for 3.4
Date published: 2026-04-18
Rated 5 out of 5 by from AMAZING! I can see and feel a noticeable difference when using this product! I’m hoping to see more new growth soon I received this product for free in exchange for my honest opinion
Date published: 2026-04-17
Rated 4 out of 5 by 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 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 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 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 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 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 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 from Acidic bonding without being heavy! [Employee of saloncentric] 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
Rated 2 out of 5 by from Not impressed I wanted to like this serum. Giving it 2 stars because I like the scent. I just hated how my hair felt after it was dry. It felt like I had way too much dry shampoo or like I didnt wash my hair for a week and it just over all felt gross. Thanks to bzzagent for the product for review.
Date published: 2026-03-27
Rated 4 out of 5 by from Gives my thin hair hope The scent was fresh.After washing and conditioning my hair I sprayed this on my scalp and rubbed in and blowed dried as usual.Made my thin hair happy and fuller.
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 4 out of 5 by from Good! This product is okay! I agree with others who say it’s a bit drying. I think it works great with the system and seeing a difference
Date published: 2026-03-26
Rated 3 out of 5 by from Just ok Supposed to be great I don’t love it. Was impressed it has heat protection though! Made hair feel stiff but maybe I used too much.
Date published: 2026-03-26
Rated 3 out of 5 by from Just ok! The smell and ease of application is great. I feel like this dries out my clients hair, which would great for someone with oily scalp, but not everyone ..
Date published: 2026-03-26
Rated 2 out of 5 by from Just Ok Leave a film on the hair for me. I like the scent but overall its just ok.
Date published: 2026-03-26
Rated 4 out of 5 by from Worth trying if you have hair fall from glp-1 I received this product complimentary in exchange for an honest review. I have been experiencing hair fall (not breakage) from using a glp-1 medication. My hair type is usually thick and coarse but has thinned significantly. I have really been enjoying this serum from redken. I feel like the hair fall I was experiencing was already tapering off after three months of significant shed but the acidic grow full really gave my hair an oomph it needed. I think the caffeine in this product is doing something. I see new little baby hairs and I'm excited!
Date published: 2026-03-26
Rated 5 out of 5 by from Love Smells amazing. Clients see noticeable difference.
Date published: 2026-03-26
Rated 5 out of 5 by from Smells great and doesn't weigh down the hair. Hair feels full with more volume nearly instantly! Super easy to use, highly recommend!!
Date published: 2026-03-26
Rated 3 out of 5 by from Okay Hair does feel and look fuller after usage though it also feels a little dry where the serum is applied. It is easy to use and but leaves fingers a little sticky after massaging it into scalp.
Date published: 2026-03-24
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