The Vitamin C 23 Serum — Reddit Reviews

• Hyperpigmentation

  Some evidence

  Vitamin C: 9 studies tested it on its own. See all 19 studies→

  On Reddit: PIH starts fading within two months with daily use, one commenter reports. 10 mentions

  What the studies found

  • Most studies found vitamin C helped fade dark patches, especially in melasma
  • It faded melasma better than a placebo when put on the skin
  • It often worked about as well as other common options for melasma
  • It improved results when used with procedures like microneedling, sound waves, or acid peels
  • The most common side effects were mild and brief irritation

  Studied at 3–30% · this product: 23%

• Anti-Aging

  Some evidence

  Vitamin C: 4 studies tested it on its own. See all 12 studies→

  What the studies found

  • All 4 studies that tested it on its own found it helped with signs of aging
  • It improved wrinkles, including crow’s-feet, and made skin feel smoother
  • It improved the look and texture of sun-damaged skin
  • Some studies found it improved skin tone and lightened skin
  • No irritation or sensitivity was reported in one study

  Studied at 5–10% · this product: 23%

• Skin Barrier

  Not proven yet

  Few or mixed studies. This claim isn't established.

  Panthenol: 1 study tested it on its own. See all 11 studies→

  What the studies found

  • The one study that tested it on its own found it helped the skin barrier
  • Skin treated with panthenol lost less water through the skin
  • The benefit was clearest at 1.0% and 5.0% strengths

• Dehydration

  Not proven yet

  Few or mixed studies. This claim isn't established.

  Panthenol: 1 study tested it on its own. See all 4 studies→

  What the studies found

  • The one study that tested it on its own found it helped dehydrated skin
  • Skin held more water after panthenol was put on the skin
  • Panthenol also improved the skin barrier, which helps skin keep moisture in
  • It did not seem to harm the skin's natural bacteria in this study

Research context, not treatment advice. Studies are about the ingredient, not necessarily this exact product.