To use a 10% niacinamide serum, follow these steps: 

1. Cleanse your face: Start by washing your face with a gentle cleanser to remove any makeup, dirt, and oil.
2. Apply toner: Adding a toner like our HYA Rose Toner to your skincare routine sets the stage for the rest of your products to work more effectively.
3. Apply the serum: After cleansing, take a pump of the serum onto your fingertips and gently massage it into your face and neck.
4. Follow with moisturizer: After the serum has absorbed, apply the moisturizer to lock in hydration and protect your skin. 

Note: Remember that niacinamide is a supportive ingredient in skincare and not a replacement for sun protection. Use it in conjunction with sunscreen for best results in your skincare routine.