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🌿 Unlock your scalp’s full potential—because your hair deserves VIP treatment.
Dr. Groot Hair Thickening Serum is a clinically tested, Korean-inspired scalp treatment designed to reduce hair loss from breakage by over 80%, balance scalp oil, and boost hydration. 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—free from parabens, silicones, sulfates, and gluten. Ideal for adults seeking a scientifically proven, non-greasy solution for fuller, thicker hair.














| ASIN | B0DK22L979 |
| Active Ingredients | salicylic_acid |
| Age Range Description | Adult |
| Age range (description) | Adult |
| Best Sellers Rank | #3,225 in Beauty ( See Top 100 in Beauty ) #5 in Scalp Treatments |
| Brand | Dr. Groot |
| Brand Name | Dr. Groot |
| Customer Reviews | 3.0 out of 5 stars 283 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 |
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!
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.
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**R
Scalp health game changer
Absolutely love this product and have noticed a difference since using consistently from January 2026. I do wish it had a window to see how much product remains.
K**A
Not so easy applicator.
So far I haved used it and i love the way it feels and I love the smell, unfortunately a week into using it the serum stopped coming out and I thought that I had run out. Fortunately after prying it open I found that I haven't even used a quarter of it, the applicator got clogged and wouldn't let anything out no matter how many times I have tried. For the week I used it I loved how my hair felt. I just wish the applicator was better (I switched it over to a bottle and there was still a good amount left in)
Trustpilot
1 week ago
1 week ago