Vitamin C Serum in Winter: Keep It, Pause It or Change Your Routine?

Dry skin is a familiar complaint once the weather turns colder, and vitamin C users often ask the same thing at this time of year: should the serum stay in the routine, or does it make winter dryness worse? The short answer is that vitamin C usually can stay. What tends to need changing is everything around it.

What dry winter air does to skin

The outermost layer of skin holds water in with a mix of lipids. When the air is dry, water can leave that layer more easily. A 2026 analysis of Google search data across US states found that colder places with lower humidity showed more interest in dry skin and moisturisers. That does not measure skin directly, but it fits what many people notice.

Indoor heating adds to the problem where it is used. In a Korean split-face study run in January and February, healthy women spent about six hours in a heated room. Roughness and redness on the face increased, and the side treated with a ceramide cream held up better. The authors tested a moisturiser, not vitamin C, so the lesson concerns barrier care in general.

The picture is not entirely simple. In a Japanese study of 40 women who spent six hours in 20% and 60% humidity, skin hydration rose only in the more humid air. Water loss through the skin actually fell in both settings over those few hours, and the response varied with how each person's skin barrier measured at the start. Short lab stays are not a full winter, and individual skin matters.

Does vitamin C help or hurt in winter?

We did not find a trial that tested vitamin C serums specifically across a winter season, so nobody can honestly promise a winter benefit or a winter risk. What we do have is general evidence about the ingredient.

A 2025 review of vitamin C and skin notes that it may support ceramide production in keratinocytes, which are the main cells of the outer skin. That is a reason for interest, not proof that a serum repairs a dry barrier on your face. Treat vitamin C as an antioxidant and brightening step, not as a moisturiser.

The same review describes stinging, redness and dryness as uncommon and usually manageable with a moisturiser. It also explains that L-ascorbic acid needs a pH below 4 to get into skin. An acidic product can feel sharper on skin that is already dry or cracked, so if a serum you tolerated in summer starts to sting in winter, look at the state of your skin before blaming the bottle.

How to adjust your routine

• Add moisture, not more actives. Follow the serum with a moisturiser containing ingredients such as ceramides, glycerin or hyaluronic acid. Our guide to vitamin C serums for dry skin covers what to look for.
• Ease off if skin is irritated. Going from daily use to alternate days for a while is a reasonable step. There is no need to stop altogether unless your skin keeps reacting.
• Avoid stacking acids. If you also use exfoliating acids, winter is a good time to space them out. See vitamin C with AHA and BHA.
• Consider a gentler form. If L-ascorbic acid keeps stinging, a derivative may be easier to tolerate, though it usually has less direct evidence. Our comparison of L-ascorbic acid and derivatives explains the trade-off.
• Keep the order simple. Thin products go on first and thicker ones after. Our layering guide walks through the steps.

Do not drop sunscreen because it is cold

Cooler weather does not switch off ultraviolet light, and a bright winter day can still bring plenty of it. Vitamin C does not replace sunscreen, so if you use your serum in the morning, keep sunscreen as the last step all year.

Winter is not the same everywhere in India

A dry, cold January in the north asks more of your skin than a mild, humid one on the coast. Go by how your skin behaves rather than by the calendar. Tightness and flaking point to more moisturiser, while a heavy cream on already comfortable skin may simply feel greasy.

If tingling turns into burning, swelling or a persistent rash, stop the serum and see a dermatologist. Our guide to vitamin C side effects explains the difference. To compare current options, including form and strength, browse our serum list.