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Ingredient

Ascorbic Acid

a type of Vitamin C · Korean label: 아스코빅애씨드

Pure vitamin C, a potent antioxidant that neutralizes free radicals from UV and pollution, acts as a cofactor for collagen synthesis, and inhibits tyrosinase to brighten and even skin tone.

Key facts

INCI name
Ascorbic Acid
Also known as
Vitamin C · 아스코빅애씨드
Evidence grade
strong evidence
Pore-clogging
0/5 (a contested measure — take it lightly)
Reviewed

Similar ingredients

others that do something alike

What it does

strong evidence

Benefits

  • Strong antioxidant that helps defend against UV and pollution damage
  • Supports collagen production for firmer, smoother skin
  • Brightens dark spots and evens tone by limiting melanin
  • Works synergistically with vitamin E and sunscreen for photoprotection

Side effects

  • Can sting or irritate, especially at the low pH needed to work
  • Unstable: oxidizes and loses potency (turns yellow/brown) with air and light
  • May be too sensitizing for very reactive skin at high strengths

Who it's for

Most skin types wanting antioxidant defense, brightening, or anti-aging

Who should be careful

Very sensitive skin may prefer a gentler vitamin C derivative

Researched & reviewed · July 2, 2026

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