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Dr. Groot’s Award-Winning Hair Thickening Serum is a clinically tested, Korean-inspired scalp treatment that reduces hair breakage by 82.2%, controls oil by 46.42%, and improves scalp hydration by 30%. Featuring a precision roll-on applicator and a menthol-infused gel, it exfoliates, cleanses, and nourishes with powerful natural ingredients like biotin and caffeine—free from parabens, silicones, sulfates, and gluten—for visibly thicker, healthier hair in just two weeks.

| ASIN | B0DK22L979 |
| Active Ingredients | salicylic_acid |
| Best Sellers Rank | #5,028 in Beauty & Personal Care ( See Top 100 in Beauty & Personal Care ) #41 in Hair Regrowth Treatments |
| Brand | Dr. Groot |
| Brand Name | Dr. Groot |
| Customer Reviews | 3.0 out of 5 stars 336 Reviews |
| Hair Type | All |
| Item Form | Gel |
| Item Highlight | Korean Scalp Treatment Roll-On, Clinically Tested for Thicker-Looking Hair, Helps Reduce Hair Shedding & Excess Scalp Oil |
| Item Volume | 0.5 fluid ounces |
| Manufacturer | Dr. Groot |
| Number of Items | 1 |
| Recommended Uses For Product | Hair Thickening, Reduces Oil, Strengthening |
| UPC | 803954310108 |
G**R
Before and after
Amazing it made my hair so thick and full on the first week I highly recommend the product line I love Dr. Groot ❤️❤️❤️
B**E
Barely anything in it!
Don’t be fooled by size!!! I never review things, but here I am. Listen to the other ppl saying it doesn’t last! Bc it doesn’t! I used this for 3 days! 3!!! It two small sections of my head-the front temple areas-morning and night. Went to use it this morning-completely gone. It did not leak. I have tried everything to get a drop out-nothing. It gave me one tiny pump and then nothing but dry. I really liked it bc it didn’t turn that section of my hair oily like others, and it didn’t leave a residue. But the amount of money it costs, for it to not even last a week, is extremely frustrating! I can’t imagine ppl using this long term!
A**A
Not enough product
Ran out by the 5th use.. for the price unfortunately it’s just not worth it. I mainly used it for the sides of my scalp and the back but in order for the product to be saturated properly on your scalp you do have to use your hands. I like the concept but of the pen and how it’s supposed to stimulate hair growth on the scalp using the roller but you’re better off finding a product & scalp tool that can go a lot further for your money/time.
K**H
It works!
Great product! Small tiny hairs started popping out of nowhere.
M**I
Disappointed.
I was really excited for this product but when using it the solution would barely come out and eventually stopped coming out completely. Huge waste of money since I barely got any use out of it. Seems like there is an issue with the packaging used to disburse the solution.
A**L
Not much product
Not sure if it works I use it 3x and the product was gone I had read the reviews but I was very shocked how empty the bottle was so not really sure if this works. I want to keep trying but for the price and only 3x usage not sure if I want to risk it
N**A
A family favorite, especially for fine hair
I have fine hair, and had significant thinning around my temples due to styling and genetics. I've have tried a number of different products and this works the best. In 1 month, I've grown at least 1-2 inches of baby hairs. Although some of the new hair is gray, a win's a win! I have other family members that use the same solution and have seen similar changes. I also use this with Dr. Groot's Hair Thickening Shampoo, and Miracle In-shower treatment. When I was using only the Hair Thickening Shampoo, I didn't see much of a difference. However, when I added this serum plus the Miracle In-Shower treatment I saw an improvement with hair growth. Just fyi, it may take longer than 2 weeks to see a change. I'm not sure how folks are out of solution after a few uses. I wear this solution once a day and its lasted me a month already - and I still have plenty left. Perhaps to get the most of the product, when it's not in use, make sure that the pen stands upright and that you ensure the button to pump the is turned off to avoid spilling.
J**E
Value and amount of product
For the amount theyre charging its not worth the buy. I was super excited to try this but i literally only got 1 day of use 😭.. it says to use 5 clicks per use and you legit only get maybe 5 clicks for the full product…
D**A
Disappointed – significant differences from my previous purchases
I have bought and used this serum multiple times previously and found this specific order to be inconsistent with what I normally receive. The liquid is completely thin and watery rather than the viscous gel texture I am accustomed to, causing it to leak through the rollerball applicator. The packaging print and barcode proportions also differ noticeably in sharpness and alignment from the authentic tubes I have at home. I have contacted customer support for a return and refund.
Trustpilot
1 day ago
3 weeks ago