Dr. Groot Hair Thickening Serum Roll-On Applicator — Menthol Scalp Treatment for Thinning Hair, Reduces Oil & Breakage

Dr. Groot Award-Winning Hair Thickening Serum is a menthol-infused roll-on scalp treatment clinically tested to reduce breakage-related hair loss and help create the appearance of thicker, healthier hair.

This lightweight, watery gel serum from Dr. Groot is designed to treat the scalp with the same targeted care you expect from skincare. The metal-tipped roll-on makes it simple to apply product precisely where you need it, while active ingredients like biotin, salicylic acid, niacinamide, caffeine and rosemary leaf extract work together to refresh the scalp, reduce oil, and support stronger-looking strands. The non-greasy formula is free from parabens, silicones, sulfates and gluten for an everyday-friendly routine.

How quickly will I notice changes in shedding and scalp condition?

Clinical testing showed measurable improvements within two weeks for many users: a large reduction in hair loss due to breakage and better scalp moisture balance. Individual results vary, but the formula’s combination of exfoliating and hydrating ingredients helps create a healthier environment for hair to look fuller.

• 82.2% reduction in hair loss due to breakage reported in two-week testing*
• 39.52% decrease in scalp moisture loss measured in trials
• 30% improvement in scalp hydration from humectant ingredients
• 46.42% reduction in scalp oil observed in clinical data

What makes the roll-on applicator better than other delivery methods?

The metal-tipped roll-on provides precise placement so you can target thinning areas without wasting product or making a mess. The cooling metal tip also delivers a refreshing sensation that helps distribute the menthol-infused gel evenly along the targeted scalp zones.

• Precision spot application reduces contact with hair shafts
• Metal tip cools and soothes while aiding absorption
• Watery gel texture absorbs quickly, leaving no heavy residue
• Easy to use on-the-go for daily maintenance

Which active ingredients are included and what do they do?

Dr. Groot’s formula blends exfoliants, botanicals and supportive compounds chosen for scalp health and strand resilience. These ingredients work together to cleanse, hydrate and help reduce oiliness while supporting stronger-looking hair over time.

• Salicylic acid gently exfoliates and clears buildup from follicles
• Biotin and panthenol help strengthen hair fibers and improve appearance
• Niacinamide supports scalp barrier function and hydration
• Caffeine and rosemary leaf extract provide antioxidant and invigorating effects

How should I incorporate this serum into my routine for best results?

Use the roll-on directly on dry or towel-dried scalp in targeted spots once daily or as directed. Consistency is key: regular application helps maintain scalp balance and preserve the visible benefits measured in clinical testing.

• Apply to thinning or problem areas with the metal tip for accurate coverage
• Gently massage or comb through if desired to spread product
• Use alongside a gentle cleanser; avoid mixing with harsh sulfates
• Follow package directions for frequency and amount

Who this is for: Dr. Groot Hair Thickening Serum is suited for people experiencing hair thinning or increased breakage who want a targeted, non-greasy scalp treatment. It’s formulated for those who prefer evidence-backed skincare-style scalp care, seek to reduce oiliness and scalp redness, and want a convenient roll-on for precise application. The product is free from parabens, silicones, sulfates and gluten, making it a practical option for daily use in many haircare routines. Note: results depend on individual scalp condition and consistent use; avoid if you have known sensitivities to any listed ingredients.

Ingredients

Water, alcohol denat., niacinamide, panthenol, adenosine, glycerin, salicylic acid, sodium hyaluronate, retinol, ceramide NP, caffeine, biotin, tocopherol, various amino acids, plant extracts (such as rosemary, centella asiatica, eucalyptus, scutellaria, and chamaecyparis), fermented lysates (bifida, lactococcus, lactobacillus, saccharomyces), moisturizers (butylene glycol, dipropylene glycol, trehalose, beta-glucan, inulin), antioxidants (ferulic acid, magnesium ascorbate), and fragrance components including limonene, linalool, citronellol, geraniol, citral, hexyl cinnamal, hydroxycitronellal, and coumarin.