Vitamin C is an antioxidant. In a daily routine it helps skin look brighter and more even, and it fits neatly into the morning under sunscreen. To choose a serum, look at the form of vitamin C, the strength, the packaging and how well it sits with the rest of your routine.
What does vitamin C do for skin?
Vitamin C is one of the best-known ingredients in skincare, and it works mainly as an antioxidant. Through the day your skin meets things like UV exposure and pollution, and antioxidants help skin stay looking fresh and comfortable against that everyday stress. Used regularly, a vitamin C serum helps skin look brighter and more even in tone.
It also pairs well with sun protection. Vitamin C and sunscreen do different jobs, so wearing your serum in the morning and your SPF on top is a sensible combination. The serum supports a brighter-looking complexion while the sunscreen handles UV. Think of vitamin C as a daytime habit rather than a quick fix, because appearance changes build slowly with steady use.
What is vitamin C good for?
Most people reach for vitamin C when their skin looks dull or uneven. It is a popular step for anyone who wants a fresher, more radiant look, and it is gentle enough for most skin types once the strength suits you. If the look of dark spots is your main concern, vitamin C is one piece of the picture, and you can read more in our guide to dark spots and what actually helps.
One note on dark spots. If a spot changes in size or colour, or looks different from the others, see your GP or a dermatologist to have it checked. Skincare is for appearance, not diagnosis, so anything that looks unusual is worth a professional opinion.
How do I choose a vitamin C serum?
A few things make the difference between a serum you enjoy and one that sits forgotten in the drawer.
- Form. Pure vitamin C, known as L-ascorbic acid, is the classic form. Gentler derivatives suit sensitive skin and tend to feel milder on application.
- Strength. A higher percentage is not automatically better. A comfortable strength you reach for every day beats a strong one you keep avoiding.
- Packaging. Vitamin C is happiest away from light and air, so opaque or airless packaging helps keep it fresh for longer.
- Texture. Pick something that layers well under your moisturiser and SPF without feeling heavy or sticky.
Our Vitamin C Serum is a brightening serum built for daily morning use, and it sits alongside the rest of the Glow & Brighten collection if you would like a matching routine that works together.
Vitamin C in the morning with sunscreen on top is one of the simplest routines you can keep.
Vitamin C serum or vitamin C cream?
A serum is a light, concentrated step you apply before your moisturiser. A cream is thicker and usually doubles as your moisturising layer. Serums tend to carry a higher, fresher dose of active ingredients, which is why a vitamin C serum is the more common choice for a brightening step. If you prefer fewer steps, a vitamin C cream can work, though a dedicated serum gives you more control over the strength you apply.
How do I use a vitamin C serum on my face?
Keep it simple. In the morning, cleanse with something gentle like our Radiant Glow Cleanser, then smooth a few drops of serum over clean, dry skin. Follow with your moisturiser, and finish with sunscreen such as our SPF30 Tinted.
Remember that no sunscreen blocks 100% of UV, so reapply every two hours when you are out in the sun. If your skin is new to active ingredients, start every other morning and build up as it gets comfortable. There is no reward for rushing.
Can you use vitamin C with niacinamide?
Yes. The old idea that vitamin C and niacinamide cancel each other out comes from decades-old lab conditions, not from everyday skincare. In a normal routine they layer together without trouble, and plenty of people use both. If you like the pairing, our Exosome & Niacinamide Serum combines niacinamide with apple exosomes, centella and hyaluronic acid, and works well alongside a vitamin C step.
Common vitamin C myths
- Higher percentage means better results. Comfort and consistency matter far more than a big number on the bottle.
- Vitamin C replaces sunscreen. It does not. It sits under your SPF, and it is not a substitute for it.
- You can only use it at night. Morning is a common and practical choice, worn under sunscreen.
- It works overnight. Skincare is a slow, steady habit, and the look of your skin changes gradually.
Not sure where vitamin C fits for you? Start with one brightening step in the morning and give it a few weeks before you judge the look of your skin.
Quick answers
Does vitamin C brighten skin?
Used regularly, a vitamin C serum helps skin look brighter and more even in tone. It works best as a daily morning step under SPF.
When should I apply vitamin C?
Most people apply it in the morning on clean skin, before moisturiser and sunscreen. Evening use is fine too if you prefer it.
Can I use vitamin C every day?
Yes, daily use is common and usually well tolerated. If your skin is sensitive, start a few mornings a week and build up slowly.
Which Portrelle serum has vitamin C?
Our Vitamin C Serum is a brightening serum for daily use. You will find it in the Glow & Brighten collection.
Read next
Should you use vitamin C serum in the morning or the evening?
Morning is the classic slot. Vitamin C works as an antioxidant, so it pairs naturally with your daily SPF for antioxidant support through the day. You put the serum on first and your sunscreen over the top, and together they make a simple daytime pair.
Evening works fine too, especially if your morning routine already feels full. The honest answer is that consistency matters far more than timing. Pick the moment you will actually repeat every day, and stay with it.
Experiential claims describe how skin looks and feels. Individual results vary.
