Dear customer, this is a fantastic product for moisturizing and nourishing your lips. However, if you're planning to use it as a moisturizer, it's best to apply it under your lipstick. Because this product has a moisturizing property, it will soften your lips and make the lipstick glide on more smoothly. If you're planning to apply it over lipstick, you might need to be a little more careful. Because this lip oil can give you shine and a subtle shimmer while moisturizing your lips, which can ruin the look you're going for when you're wearing matte lipsticks. However, if you want to apply it over lipstick, you can apply it lightly to give your lips a natural shine and moisture. Best regards.xx