+8%
In a 9-person pilot, massaged strands got slightly thicker.
9 men used a scalp-massage device for 4 minutes a day on one side of the head. The massaged side never differed significantly from the other side.
On the massaged side, hair strands grew about 8% thicker over 24 weeks, from 0.085 mm to 0.092 mm.
| Start | 0.085 mm |
|---|---|
| After 24 weeks | 0.092 mm |
| Change | +8% thicker |
