the claim The Pyunkang Yul Essence Toner claims to nurture, hydrate, soothe and revitalise dull skin.     the science Another offering from the renowned Pyunkang Oriental Medicine Clinic in Seoul, Pyunkang Yul, this essence toner follows the principles of minimal ingredients for maximum concentrated benefits. The key active in the formula is present at a huge concentration of 91.3%. Astragalus Membranaceus (Milk Vecht) Root Extract has been used in eastern medicine for over 4,000 years as a tonic and an antipathogen.   It is able to revitalise by improving circulation which increases blood flow to areas of topical application. This activity removes toxins caused by inflammation and allows nutrients…