The exokiss journal · skincare · 3 min read
How to use vitamin C serum: morning or night, and what to pair it with
By the exokiss team ·
In short
- Use vitamin C serum in the morning, on clean skin, before moisturizer and sunscreen.
- A few drops or one pump is enough for the whole face.
- It pairs well with niacinamide, hyaluronic acid and peptides. Keep retinol for the evening.
- Sunscreen is the step that protects the result: vitamin C works alongside it, not instead of it.
Vitamin C is one of the most popular skincare ingredients for a brighter, more even-looking complexion, and also one of the most asked-about. Morning or night? Before or after moisturizer? Can it go with niacinamide? Here is how to use a vitamin C serum so it actually earns its place in your routine.
Why vitamin C belongs in the morning
Vitamin C is an antioxidant. During the day your skin meets UV light and pollution, which create unstable molecules called free radicals; antioxidants help neutralize them. That's why most dermatologists suggest applying it in the morning, under sunscreen. Research also shows that pairing vitamin C with ferulic acid helps keep the formula stable and boosts its protective effect.
You can use vitamin C at night if that suits you better. It won't hurt. But mornings make the most of it.
How to use vitamin C serum, step by step
- Cleanse. A gentle wash, such as our Glow Facial Wash, a soft mousse with aloe and blackberry extract that doesn't leave skin tight.
- Apply the serum to dry or slightly damp skin: one pump or a few drops, pressed over face and neck.
- Moisturize. Let the serum settle for a minute, then your usual cream.
- Sunscreen, every morning, as the last step.
- Top up through the day with a mist if skin feels tight. It sits fine over makeup.
Our Vitamin C Serum
Our Vitamin C Serum is a creamy serum with 2% vitamin C and 1% ferulic acid, in sea buckthorn, jojoba, sweet almond, avocado and rosehip oils. It softens skin and leaves it looking brighter and more even. It suits all skin types, is COSMOS Natural and vegan, and sits at a skin-friendly pH of 6.5 to 6.8.
It's step 2 of our Glow routine: wash, vitamin C, then a spritz of Prebiotic Face Mist whenever your skin wants a lift.
What to pair vitamin C with (and what to keep apart)
| Ingredient | With vitamin C? | How |
|---|---|---|
| Niacinamide | Yes | The old "don't mix" warning came from lab tests with heat; in modern formulas they work fine together. |
| Hyaluronic acid | Yes | Layer a hydrating serum or moisturizer on top. |
| Peptides | Yes | Vitamin C in the morning, peptides morning and night. |
| Retinol | Use at different times | Vitamin C in the morning, retinol at night. |
| Strong acid exfoliants (AHA/BHA) | Use at different times | Exfoliate in the evening to avoid irritation. |
| Sunscreen | Always | Vitamin C supports, but never replaces, SPF. |
Comparing evening actives? Read peptide serum vs retinol.
What to expect
Skin often feels softer right away. A brighter, more even look builds over several weeks of daily use, so give it 8 to 12 weeks. Patch test first if your skin is reactive, and stop if it stings or turns red.
Frequently asked questions
Should I use vitamin C serum in the morning or at night?
Morning is best for most people, because vitamin C is an antioxidant that works alongside your sunscreen during the day. Using it at night is fine if that fits your routine better.
Do I apply vitamin C before or after moisturizer?
Before. Apply serums to clean skin first, then moisturizer, then sunscreen in the morning.
Can vitamin C serum cause redness?
Some people with sensitive skin notice tingling or redness, especially with strong, low-pH formulas. Patch test first, use it every other day to start, and stop if irritation continues.
Is it better to use retinol or vitamin C?
They do different jobs, so many people use both: vitamin C in the morning for a brighter look and antioxidant support, retinol or a gentler alternative at night.
Can I use vitamin C with niacinamide?
Yes. In today's formulas they're compatible. Apply one after the other, or use vitamin C in the morning and niacinamide at night if you prefer.
Sources
Telang P.S. Vitamin C in dermatology. Indian Dermatology Online Journal, 2013;4(2):143–146.
Lin F.H. et al. Ferulic acid stabilizes a solution of vitamins C and E and doubles its photoprotection of skin. Journal of Investigative Dermatology, 2005;125(4):826–832.
Product details are taken from the exokiss Vitamin C Serum page. This article is general information, not medical advice.
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