Korean skin essence is a lightweight water-based liquid that functions to prime and re-balance the skin with an extra layer of hydration before proceeding to apply serum or ampoule. An essence is usually formulated with ingredients that help hydrate and nourish the skin. It is a part of the skin treatment phase in a routine and is usually thinner in texture.
Whether you choose to include an essence in your skincare routine is up to your personal preference and the underlying concern you have for your skin. The use of an essence is great when you have dry skin that needs a boost in moisture before using a serum, or if you need a product that is lightweight on days that you have irritated skin.