White birch

White birch, as the sap tapped in spring or the bark extract.

What it does: Used in serums, creams, ampoules and toners, where birch sap stands in for some of the water for light, fresh hydration.
How often: Morning and evening in most everyday skincare; use the vitamin C serum on one or two evenings a week, and masks or makeup-prep pads as weekly care. Sunscreen needs daytime reapplication, and the set reserves its shot essence for evenings.