

🌿 Unlock your scalp’s full potential—because your hair deserves the VIP treatment.
Dr. Groot’s Award-Winning Hair Thickening Serum is a clinically tested, Korean-inspired scalp treatment designed to reduce hair loss by 82.2%, improve hydration by 30%, and cut scalp oil by 46.42% within 2 weeks. Featuring a precision roll-on metal tip and a refreshing menthol-infused gel, it nourishes thinning hair with a potent blend of biotin, rosemary, caffeine, and niacinamide—all in a clean, paraben-free formula.









| ASIN | B0DK22L979 |
| Active Ingredients | salicylic_acid |
| Age Range Description | Adult |
| Age range (description) | Adult |
| Best Sellers Rank | #4,018 in Beauty ( See Top 100 in Beauty ) #9 in Scalp Treatments |
| Brand | Dr. Groot |
| Brand Name | Dr. Groot |
| Customer Reviews | 3.1 out of 5 stars 309 Reviews |
| Hair Type | Thinning |
| Item Form | Serum |
| Item Volume | 0.5 Fluid Ounces |
| Item Weight | 0.06 Kilograms |
| Item form | Serum |
| Item weight | 0.06 Kilograms |
| Manufacturer | Dr. Groot |
| Number of Items | 1 |
| Recommended Uses For Product | Hair Thickening, Reduces Oil, Strengthening |
| Scent | rosemary |
| Scent Name | rosemary |
| UPC | 803954310108 |
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.
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.
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!
J**S
Small amount but works great
Great product but the price is rough for the amount inside. I am purchasing again just wish it was cheaper or came with more.
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.
T**N
Great quality but Not enough product. Super sad that it ran out after my 3rd or 4th use.
It didn’t even last me a week. I didnt over use it just a few pumps. From the three or four times that I used it seemed great and easy application but again it was out after my 3rd or 4th time using it, it was empty. I switched to lilyeve. I would’ve loved to continue using the product but because it ran out so quickly and the price for it.. I can’t. Maybe if the company reached out to rectify I would switch back. Not sure if that’s normal. Thought it would maybe last me like three weeks to a month. Super upset because I really enjoyed it at first.
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