Vitamin C (L-Ascorbic Acid): what it is in skincare
The pure form of vitamin C that helps brighten skin and supports defense against daily environmental stress.
What it does
Function: antioxidant / brightening. Antioxidants help defend skin against the visible effects of daily environmental stress and support a brighter, more even-looking tone.
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How to spot it on a label
On a Korean product's INCI list, look for Vitamin C (L-Ascorbic Acid). Ingredients are listed high-to-low by amount, so its position hints at how much is in the formula. See all antioxidants →
Explore the full K-beauty hub →🙋 People also ask
What is hyaluronic acid and how do you use it?
Hyaluronic acid is a humectant that draws water into the skin for a plumper, hydrated look. In Korean routines it's best applied to damp skin and sealed with a moisturizer on top, so the moisture it attracts stays locked in rather than evaporating.
Can you use vitamin C and niacinamide together?
Yes, current understanding is that vitamin C and niacinamide can be used together safely, and many Korean formulas combine them. The old warning that they cancel out is largely outdated. If your skin is sensitive, you can still apply them at different times of day to be cautious.
Related
Sodium Ascorbyl PhosphateAscorbyl GlucosideBakuchiolFerulic AcidGlutathioneMugwort (Artemisia) Extract✍️ Written & reviewed by the KoreaPlus Editorial team — dermatologist-informed, cosmetic-science researched & source-cited. Last reviewed 2026-06-21.
General educational information using cosmetic structure-function wording — not medical advice. Always patch-test new actives. © KoreaPlus.