Dr. Groot™ Hair Thickening Roll-On Serum is a precision-delivery scalp serum engineered to combat hair loss and stimulate new hair growth directly at the follicle. Its roll-on applicator ensures targeted, mess-free application right where it matters most — along the part, thinning zones, or hairline — without disturbing the rest of your hair.

What it does: Delivers a concentrated blend of hair-activating ingredients (including caffeine, biotin, and plant stem cell extracts) directly onto thinning areas of the scalp, reawakening dormant follicles and reducing daily shedding over time.

• ✅ Roll-on applicator for precise, targeted scalp delivery
• ✅ Reduces visible hair shedding within 4–6 weeks of consistent use
• ✅ Stimulates dormant follicles for new hair density
• ✅ Lightweight, non-greasy formula — no residue, no white cast
• ✅ Leave-in formula — apply and go, no rinsing needed
• ✅ Suitable for men and women, all hair types

Key ingredients: Caffeine • Biotin (Vitamin B7) • Adenosine • Capixyl™ peptide complex • Plant stem cell extract

How to use: Part hair to expose the scalp. Roll directly onto the thinning area. Gently massage in with fingertips. Do not rinse. Apply morning or night — or both for accelerated results.

Best for: Hair thinning at the crown, receding hairline, postpartum hair loss, stress-related shedding, and early-stage androgenetic alopecia.

Dr. Groot's #1 bestselling scalp treatment — and the foundation of the Complete Hair Revitalizing System.