Cleansers · 16/06/2026
The unglamorous prep step that decides whether your vitamin C serum actually absorbs
Vitamin C's absorption is highly sensitive to what's left on skin's surface before application — a thorough, residue-free cleanse isn't a separate concern from vitamin C performance, it's a prerequisite for it.
Why vitamin C serum performance is more sensitive to cleansing quality than most other actives
Vitamin C, particularly in its more potent forms, requires reasonably direct contact with skin to penetrate and remain stable enough to deliver its antioxidant function before degrading — any oily residue, leftover sunscreen film or incomplete makeup removal sitting between the serum and skin's surface reduces how much of the active actually reaches skin rather than sitting on top of residue and partially oxidising before it can be absorbed.
What a thorough oil-based cleanse contributes specifically to vitamin C performance
A proper oil cleanse removes the oil-soluble residue — sunscreen, makeup, sebum — that would otherwise sit between a vitamin C serum and the skin surface, creating a genuinely clean contact surface for the serum to penetrate. This is particularly relevant for evening vitamin C use after a full day of makeup and SPF wear, where residue buildup is at its highest.
Sequencing a vitamin C evening routine starting from a proper cleanse
Double cleanse thoroughly in the evening before applying vitamin C serum, ensuring no oily residue remains on the skin surface. Wait a few minutes after cleansing for skin to return to its normal pH and dry slightly before applying the serum — vitamin C performs best on a clean, properly-prepared surface rather than immediately after rinsing while skin is still very wet.
ETUDE White Smile Fermented Cleansing Oil 150ml — available on BuyBeautyKorea →
