Application order and waiting time for Vitamin B3 cream and Vitamin C serum

Regarding your question about using creams containing Vitamin B3 and Vitamin C together at night:

You mentioned applying the Vitamin B3 cream, waiting 1-2 hours, and then applying the Vitamin C serum. As confirmed by the staff, waiting approximately 30 minutes between applying the Vitamin B3 cream and the Vitamin C serum is sufficient. This allows each product adequate time to absorb into the skin before the next layer is applied.

Therefore, your proposed method of applying the products separately with a waiting period is correct, and a 30-minute wait is enough.