Vitamin C

Best

Antioxidant

Vitamin C at a glance

  • One of the most well-researched antioxidants
  • Improves the look of multiple signs of aging
  • Brightens an uneven skin tone
  • Also referred to as ascorbic acid

Vitamin C description

Vitamin C is one of the most well-researched and beneficial vitamins you can apply topically. Ongoing use has been shown to improve the look of multiple signs of ageing, brighten an uneven skin tone, as well as provide skin-restoring and soothing benefits. Vitamin C comes in many forms, with ascorbic acid being the most well-researched for its efficacy. Other forms of vitamin C you will see included in skincare products include magnesium ascorbyl phosphate, L-ascorbic acid, tetrahexyldecyl ascorbate, ascorbyl palmitate, ascorbyl glucosamine, and ascorbyl tetraisopalmitate. In any form, vitamin C provides potent antioxidant protection, shielding skin from damaging environmental stressors. Note: All antioxidants, including vitamin C, are vulnerable to destabilizing when exposed to air and light. That means if you want to reap the reward of your antioxidant-enriched treatments, only choose those that are packaged in opaque tubes, air-restrictive bottles, or pumps that help keep their ingredients stable.

Vitamin C references

  • Clinical, Cosmetic, and Investigational Dermatology, September 2015, pages 463-470
  • Journal of the America Academy of Dermatology, November 2012, pages 1,103-1,024
  • Skin Research and Technology, August 2008, pages 376-380
  • Dermatologic Surgery, July 2005, pages 814-817

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

Best

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

Good

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

Average

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

Bad

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

Worst

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

unknown

We couldn't find this in our ingredient dictionary. We log all missing ingredients and make continuous updates.

Not rated

We have not yet rated this ingredient because we have not had a chance to review the research on it.