L-Ascorbic Acid



L-Ascorbic Acid description

Form of vitamin C that is a potent antioxidant and skin-soothing agent and can improve the appearance of signs of ageing and help brighten an uneven skin tone. L-ascorbic acid is often labelled as the INCI compliant “ascorbic acid” on ingredient lists, but there is no difference between the two—they refer to the same ingredient.

L-Ascorbic Acid references

  • Indian Dermatology Online Journal, 2013, issue 2, pages 143-146
  • Dermatological Surgery, 2005, issue 7 part 2, pages 814-818
  • Dermatological Surgery, 2001, issue 2, pages 137-142

Peer-reviewed, substantiated scientific research is used to assess ingredients in this dictionary. Regulations regarding constraints, permitted concentration levels and availability vary by country and region.

Ingredient ratings


Proven and supported by independent studies. Outstanding active ingredient for most skin types or concerns.


Necessary to improve a formula's texture, stability, or penetration.


Generally non-irritating but may have aesthetic, stability, or other issues that limit its usefulness.


There is a likelihood of irritation. Risk increases when combined with other problematic ingredients.


May cause irritation, inflammation, dryness, etc. May offer benefit in some capability but overall, proven to do more harm than good.


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Not Rated