Detailed answer

Sunscreen should not be mixed with lip oil serum treatment as it may compromise the effectiveness of both products. Lip oils are designed to condition and hydrate the lips, while sunscreen is formulated to protect the skin from UV rays. Applying sunscreen on top of the lip oil serum may create a barrier that prevents the lip oil from being properly absorbed. It's recommended to apply lip balm with SPF separately to protect the lips from sun damage.