brightening
Vitamin C
비타민 C · 維他命 C
Also known as: L-Ascorbic Acid, Ascorbyl Glucoside, THD Ascorbate
What it actually does
An antioxidant commonly used in cosmetic formulations intended to help support a brighter, more even-looking tone with regular use.
How to use it
Best in an AM serum before sunscreen. Store away from light and heat — brown or oxidised Vitamin C has lost its potency.
The science, in plain English
L-Ascorbic Acid is the most-studied form of topical Vitamin C — effective in some studies but chemically unstable. Derivatives (SAP, MAP, THD) are generally more stable, with somewhat more limited direct evidence.
Myth vs reality
A higher percentage is not automatically better — form, pH and formulation stability matter more than percentage alone.
Limitations of the evidence
Evidence is strongest for stable, well-formulated forms at effective concentrations; results vary and are not guaranteed for any individual.
Who may need extra caution
May not suit very reactive skin, particularly at higher concentrations.
Evidence review date
Not yet reviewed
Sources
Not yet reviewed
Pairs well with
- Vitamin E
- Ferulic Acid
- SPF
- Hyaluronic Acid
Don't layer with
- High-strength Niacinamide in the same layer
- AHAs/BHAs on the same morning
Shop products with Vitamin C
No products in our catalogue are tagged with this ingredient yet — check back soon.