Ingredient N° 19
A PHA for measured surface exfoliation.
Gluconolactone is a polyhydroxy acid used for gentle surface exfoliation and humectant support. Its larger molecular structure is often chosen for skin that finds conventional AHAs too assertive.
Worth knowing
It is still an exfoliant; introduce it gradually and keep sunscreen in the morning routine.
Sources checked · 2026-07-18
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Beauty of Joseon