Best shampoo for combination scalps I was impressed by how quickly this serum soaked into my skin without leaving behind a sticky residue. This rapid absorption rate allowed me to quickly proceed to the next steps of my routine, such as applying face sunscreen and foundation. Most importantly, I noticed instant hydration after applying this face serum. Within one week, my skin began to look plumper, and by around week three, the flare-ups had completely disappeared. I’ll continue using this face