Based on the reviews, the DIVE IN Low Molecular Hyaluronic Acid Serum by Torriden can be used both in the morning and at night. Many users have reported using it twice daily, which indicates that it is suitable for both morning and evening skincare routines. Here are some tips based on the reviews: - **Morning Routine:** Users have mentioned that the serum absorbs beautifully and feels lightweight, making it perfect for use under makeup. It can help to hydrate the skin and prepare it for the day ahead. - **Night Routine:** At night, the serum can be used to provide deep hydration while you sleep. Some users have noted that it works well when layered with a cream or other moisturizer. **Related Questions for You:**