How do I apply Exiderm spray and how often should I use it?

Spray the product directly onto the scalp after washing, while the hair is still damp. Part the hair in sections to reach the root area evenly, then massage gently with fingertips so the liquid distributes across the skin rather than sitting only on the hair shafts. Do not rinse — the leave-on format is designed for extended contact.

There is no single mandatory frequency. Many people start with two to three applications per week (for example, after each hair wash) and adjust based on how the scalp feels. If the scalp feels comfortable and the hair looks fresher at the roots, you can maintain that rhythm. If you notice dryness or irritation, reduce frequency. Because the formula contains birch tar, which has a strong characteristic scent, some users prefer evening application so the smell has time to fade overnight.

The 150 ml bottle typically lasts several weeks with regular scalp-only use, since you only need enough to cover the root area, not the full hair length. Store at room temperature, away from direct sunlight, and keep the cap closed to prevent the volatile tar compounds from evaporating.