COYA Shampoo: Apply COYA shampoo on pre-moistened scalp (hair roots) every 2-3 days. Gently massage the shampoo into the scalp with your fingertips for 1 to 2 minutes. Rinse the shampoo with warm water.

COYA Serum: After using COYA shampoo, dry your hair with a towel. Spray the serum directly on your scalp and gently massage it for 1-2 minutes. Do not rinse. For oily or greasy hair, apply for 3-4 hours and wash. For oily or greasy hair, use 1-2 hours before bathing. Use SOUA serum every 2-3 days.

You can get the best effect after using both products in a set.