Is Vitamin C safe during pregnancy?

Vitamin C is generally considered safe to use during pregnancy. Always consult your healthcare provider for personalized advice.

What skin types is Vitamin C best for?

Vitamin C is particularly well-suited to mature, combination, oily, dry skin. It may be less ideal for sensitive skin.

What ingredients pair well with Vitamin C?

Vitamin C layers well with vitamin e, hyaluronic acid, ceramides. These combinations are common in K-beauty routines and have no known negative interactions.

Can I use Vitamin C with niacinamide?

Can reduce efficacy when used simultaneously at high concentrations — use at different times Consider alternating them (e.g. AM/PM) or using them on different days.

AntioxidantWell-Known

Vitamin C

Also known as: L-ascorbic acid, ascorbic acid, ascorbyl glucoside, ethyl ascorbic acid, MAP

5/5— Very Strong Evidence

Medically reviewed by ChokChok · Updated December 1, 2024

Vitamin C is one of the most thoroughly researched antioxidants in dermatology. It neutralizes free radicals, inhibits melanin production, and supports collagen synthesis. The challenge is formulation stability — L-ascorbic acid oxidizes easily, and many products degrade before you finish the bottle.

What It Does

brighteningantioxidantcollagen synthesisphotoprotectionhyperpigmentation

Deep Dive

The Antioxidant Powerhouse

Vitamin C (most commonly as L-ascorbic acid) is a potent antioxidant that neutralizes free radicals generated by UV exposure and pollution. It also inhibits tyrosinase, the enzyme responsible for melanin production, making it effective for both prevention and treatment of hyperpigmentation.

Forms Matter

L-ascorbic acid is the most studied and most effective form, but it's notoriously unstable. It oxidizes when exposed to light, air, or heat, turning orange and losing efficacy. Derivatives like ascorbyl glucoside, sodium ascorbyl phosphate, and ethyl ascorbic acid are more stable but require conversion in the skin and are generally less potent.

The Stability Problem

If your vitamin C serum has turned dark orange or brown, it's oxidized and potentially harmful (it can generate free radicals rather than neutralize them). Look for products in opaque, air-restrictive packaging. Water-free formulations and those with added vitamin E and ferulic acid are more stable and more effective.