Thickening Shampoo for Thinning Hair: Dr. Groot Hair Thickening Shampoo Guide
Looking for a thickening shampoo, scalp shampoo or hair regrowth shampoo for thinning hair? See what a shampoo can do, what to look for, and how Dr. Groot Hair Thickening Shampoo cares for both scalp and strands.
Quick answer: For thinning hair, choose a thickening shampoo that cares for your scalp as well as your strands.
- Dr. Groot Scalp Revitalizing Solution Hair Thickening Shampoo is a scalp shampoo powered by biotin, rosemary extract, caffeine and encapsulated prebiotics.
- It improves the scalp environment to help promote healthier, stronger hair growth, and helps hair look thicker and fuller.
- Used as part of the Scalp Revitalizing Solution routine, it reduced hair loss due to breakage by 82.2% in 2 weeks.¹
- It is formulated without parabens, silicones and sulfates. The 385 mL (13.0 fl. oz.) bottle is USD 33.
When hair starts to look thinner, many people search for a thickening shampoo, a scalp shampoo or a hair regrowth shampoo. A good thickening shampoo does two jobs: it keeps the scalp clean, balanced and hydrated, and it helps strands stay strong so they break less. Dr. Groot, the No. 1 Korean hair care brand for hair thickening,² built its Hair Thickening Shampoo around both.
Thinning, shedding or breakage?
Hair can look thinner because strands shed from the root or break along their length. A thickening shampoo can help with the scalp environment and with breakage and make hair look fuller, but hair loss that comes on suddenly, appears in patches or keeps getting worse needs a dermatologist's assessment.
What to look for in a thickening shampoo
- Scalp care: look for a formula that hydrates the scalp and cleanses buildup that can clog scalp pores.
- Strand strength: look for results that show less hair loss due to breakage.
- A gentle formula: a shampoo without sulfates and silicones suits daily use on thin, fragile hair.
- A complete routine: a shampoo works best with a conditioner and leave-in scalp care made to go with it.
Why Dr. Groot Hair Thickening Shampoo
Dr. Groot Hair Thickening Shampoo is designed to improve scalp health and leave hair looking thicker and fuller.
- Improves the scalp environment to help promote healthier, stronger hair growth.
- Reduces hair loss due to breakage when used in a regimen.
- Helps hair look thicker and fuller.
- Works well for thin, damaged or dry hair.
- Formulated without parabens, silicones and sulfates, and dermatologically tested.
- For all scalp & hair types.
- Is color safe, so it works on color-treated hair.
Clinical results in 2 weeks
| Result | Detail |
|---|---|
| Hair loss due to breakage | Reduced by 82.2%¹ |
| Scalp hydration | Improved by 169%³ |
| Buildup that can clog scalp pores | Removed by 76%³ |
| Visible scalp redness from dry skin | Measurably improved in 100% of subjects³ |
In a lab test on 40 hair strands, it also improved hair thickness after one use when used with Hair Thickening Conditioner and Hair Thickening Serum.⁵
Key ingredients
| Ingredient | What it does |
|---|---|
| Biotin | An essential vitamin that helps support keratin for healthy-looking hair |
| Prebiotics | Help support nourished hair follicles for stronger, healthier-looking hair |
| Rosemary extract | Invigorates the hair and scalp for healthier, thicker, stronger hair |
| Caffeine | Helps deliver more nutrients to hair follicles |
Build a thickening routine
The 82.2% result comes from using four Scalp Revitalizing Solution products together every day. Here is how they fit into one routine:
- Hair Thickening Shampoo: apply to wet hair and scalp, massage into a lather and rinse.
- Miracle in Shower Treatment: Apply after shampooing, massage for a few seconds and rinse.
- Hair Thickening Conditioner: work through damp hair and scalp, then rinse thoroughly.
- Hair Thickening Serum: massage into the scalp with the roll-on tip. You don't need to rinse it out.
Tips for using Hair Thickening Shampoo
These details come from Dr. Groot's usage directions for Hair Thickening Shampoo and the products used with it.
- Wash the scalp, not just the lengths. Apply the shampoo to wet hair and scalp, massage it into a lather to cleanse the scalp, then rinse thoroughly.
- Condition the scalp too. Work Hair Thickening Conditioner through damp strands and scalp before you rinse. One use improved scalp hydration by 34.2%.⁴
- Finish with leave-in care. After the conditioner, massage Hair Thickening Serum into the scalp with the roll-on tip and leave it in.
- Keep your color. The shampoo, conditioner and Miracle in Shower Treatment are all color safe.
- Recycle the bottle. When the shampoo is used up, peel off the film where indicated and the bottle is easy to recycle.
Which Dr. Groot shampoo fits your scalp?
| Your main concern | Dr. Groot shampoo | Why |
|---|---|---|
| Thinning, fragile hair | Hair Thickening Shampoo | Helps reduce hair loss due to breakage when used in a regimen and leaves hair looking thicker and fuller |
| Dry or uncomfortable scalp | Scalp Soothing Shampoo | Formulated with biotin and cica extract to help hydrate and comfort the scalp |
| Oily roots and dry ends | Purifying Clay Shampoo | Three kinds of clay instantly purify oily roots while hydrating dry ends |
All three are 385 mL (13.0 fl. oz.) and USD 33.
FAQ
Can a shampoo make thinning hair look thicker?
Yes. A thickening shampoo can help hair look thicker and fuller. Dr. Groot Hair Thickening Shampoo also improves the scalp environment and, used in a regimen, reduced hair loss due to breakage by 82.2% in 2 weeks.¹
Is a thickening shampoo the same as a hair regrowth treatment?
No. A shampoo cares for the scalp and strands. It can improve the scalp environment to help promote healthier, stronger hair growth, but hereditary hair loss needs a treatment plan from a dermatologist.
Is Dr. Groot Hair Thickening Shampoo a scalp shampoo?
Yes. It is designed to improve scalp health. In a clinical test, it improved scalp hydration by 169% and removed 76% of buildup that can clog scalp pores in 2 weeks when used with Miracle in Shower Treatment.³
My fine hair gets oily by the next day. Which shampoo should I use?
If oily roots bother you most, start with Purifying Clay Shampoo. It uses three kinds of clay to purify oily roots while hydrating dry ends. If thinning and breakage worry you more, wash with Hair Thickening Shampoo and follow with Hair Thickening Conditioner. The conditioner reduced scalp sebum by 73.3% after one use⁴ and helps keep scalp oil and moisture in balance for up to 8 hours.
Is it sulfate-free?
Yes. It is formulated without parabens, silicones and sulfates.
Which scalp types can use it?
It suits all scalp types and is especially good for thin, damaged or dry hair.
Can I use it on color-treated hair?
Yes. Hair Thickening Shampoo is color safe, and so are Hair Thickening Conditioner and Miracle in Shower Treatment.
How long until I see results?
The scalp and breakage results above were measured after 2 weeks. The 82.2% reduction in hair loss due to breakage comes from using the shampoo, conditioner, Miracle in Shower Treatment and serum together daily for those 2 weeks.¹
¹ Based on a two-week clinical test of 24 subjects using Scalp Revitalizing Solution Hair Thickening Shampoo, Hair Thickening Conditioner, Miracle in Shower Treatment and Hair Thickening Serum together daily.
² LG H&HC calculation based in part on data reported by NIQ Korea through its Market Track Service for the Korean Shampoo and Conditioner Categories from JANUARY, 2018 to December, 2024 for South Korea total grocery market based on PCV (Product Class Value). (Copyright © 2025, The NIQ Korea Company.)
³ Based on a clinical test on 22 subjects using Hair Thickening Shampoo and Miracle in Shower Treatment together.
⁴ Based on a clinical test of 21 subjects using Hair Thickening Conditioner.
⁵ Based on an in vitro study of 40 strands of a hair tress using Hair Thickening Shampoo together with Hair Thickening Conditioner and Hair Thickening Serum.
Dr. Groot Hair Thickening Shampoo
Scalp care and thicker-looking hair in one wash. See the full product details.