These Farmacy Honey Milk essence is one of my favorite hydrating essences. What's an essence? It's like a toner meets serum - thicker than a toner, thinner than a serum. You can apply to damp skin (damp skin absorbs more) or use it to dampen your skin. It's the first step of my skincare routine morning and night! It's hydrating, healing and I love the smell of it! If I am doing my LED mask, I like to use hydrating essence and serum under it. It helps lock on the hydration and plump up my skin. I'm not sure if it helps the LED penetrate more or anything - I just think of it like multi tasking. When the LED mask is on, the product can't evaporate as fast and spends more time plumping. I don't use any actives with the LED mask - just hydrating serums! The Inisfree serum is a good hydrating serum and will often use it under my mask. We have more information on the Currentbody mask on our blog, but you can always get 10% off with SISTERand use HSA and FSA funds. Screen shot this address and the. Hold your thumb over it in the picture and it should pop up as a link! https://mysistermademebuyit.com/currentbody-led-mask/ LTKOver40 LTKBeauty