Can You Use Vitamin C and Peptides Together?

Short answer: Yes. Vitamin C and peptides can sit in the same routine, and most warnings online concern specific pairings such as copper peptides rather than peptides in general. The simplest arrangement is vitamin C in the morning under sunscreen and a peptide serum in the evening. That removes the layering question entirely.

• Using both is fine. The "conflict" you read about is far narrower than it sounds.
• Easiest routine: vitamin C in the morning, peptides in the evening.
• One routine instead? Thinnest texture first, with a minute between layers.
• Timelines differ. Vitamin C brightening usually takes 4–6 weeks to show; peptides typically need 8–12.
• Start them two weeks apart, so you know which one is doing what.

What does each one actually do?

They work on different things, which is exactly why people end up wanting both.

Question	Vitamin C serum	Peptide serum
What it is	An antioxidant	Short chains of amino acids
Cosmetic aim	Brighter, more even-looking skin	Smoother, firmer-looking skin; softer-looking fine lines
In our formulas	2% natural vitamin C, 1% ferulic acid, 1% sea buckthorn, hyaluronic acid	2% Hexapeptide-11, 1% ginkgo biloba extract, hyaluronic acid, aloe
When our directions say to use it	Every morning	Morning and evening
Realistic timeline	4–6 weeks	8–12 weeks
Fragrance	Contains fragrance	Contains fragrance

Neither is a fast ingredient. Both of these serums include hyaluronic acid, which holds water in the upper layers so skin looks plumper and feels softer within minutes. That part is genuine hydration. The effect of the active itself comes later. Give each one its weeks before you judge it. Our peptides guide explains why they are slow.

Why do people say vitamin C and peptides conflict?

Because two narrow chemistry points have been stretched into a blanket rule.

The first concerns copper peptides, a specific group in which a peptide is bound to copper. The usual advice is to keep those apart from vitamin C in its pure, acidic form, because copper and ascorbic acid can react with each other. That advice is about copper peptides. Hexapeptide-11, the peptide in our serum, is not a copper peptide.

The second is pH. Pure vitamin C serums are often formulated to be quite acidic, and some peptides are more stable in a less acidic environment. There is a kernel of chemistry in that, but finished products are formulated and tested as complete systems, not as raw ingredients meeting in a beaker. What we will not do is quote a figure for how much of a peptide survives at a given pH. We do not have that data, and neither does most of the internet repeating it.

The practical answer beats the theoretical one. If it worries you, put a few hours between them. Vitamin C in the morning, peptides in the evening, and the question disappears.

How should I arrange the routine?

Two schedules work, so pick the one you will actually keep.

When	Option A: split by time of day	Option B: both in the morning
Morning	Cleanse, vitamin C serum, moisturiser, sunscreen	Cleanse, vitamin C serum, peptide serum, moisturiser, sunscreen
Evening	Cleanse, peptide serum, moisturiser	Cleanse, peptide serum, moisturiser
Layering rule	None needed	Thinnest first, a minute between layers
Best for	Most people	People who want the peptide twice a day, as its directions suggest
Downside	Peptide used once a day rather than twice	More layers, slower to finish

Option A is what we suggest to most people. Vitamin C is an antioxidant and belongs under your sunscreen in the morning, which is also the step doing the most for how skin looks in the long run. If you choose Option B, the rule is texture rather than chemistry: thinnest to thickest, with a short pause so each layer settles before the next goes on. For the wider order of steps, see our layering order guide and when to use vitamin C.

Which products, and in what order?

Both of ours are light serums, so either schedule works.

The Vitamin C Brightening Serum combines 2% natural vitamin C with 1% ferulic acid and 1% sea buckthorn for antioxidant care, plus hyaluronic acid and jojoba, avocado and rosehip oils. Apply a few drops to clean skin in the morning, then moisturiser and sunscreen.

The Peptide-Powered Anti-Aging Serum pairs 2% Hexapeptide-11 with 1% ginkgo biloba extract, hyaluronic acid, blueberry seed oil and aloe. Its directions are two or three drops morning and evening, followed by moisturiser. Both serums contain fragrance, which is worth knowing if your skin reacts easily. Other options sit in our skincare collection.

Common mistakes

• Starting both in the same week. Two new variables leave you unable to credit a result or explain a reaction.
• Judging at three weeks. Vitamin C typically needs 4–6 weeks and peptides 8–12. Stopping early is the main reason people decide a serum "did nothing".
• Skipping sunscreen after morning vitamin C. An antioxidant does not replace sun protection, and neither of these serums has SPF.
• Adding a third and fourth active at once. The more a routine holds, the harder it is to see what earns its place.
• Storing vitamin C on a sunny windowsill. Keep it closed, cool and out of direct light.

What this pairing won't do

Neither ingredient removes dark spots, erases lines or reverses ageing. Cosmetics change how skin looks and feels. Vitamin C helps skin look brighter and more even over several weeks, and peptides support a smoother, firmer-looking surface over a couple of months of consistent use. Using both does not make either one work faster. Neither replaces sunscreen, which will do more for how your skin looks in ten years than either serum.

Frequently asked questions

Can I use vitamin C and peptides in the same routine?

Yes. Apply the thinner texture first, leave about a minute between layers, then moisturiser on top. If you would rather not think about layering, use vitamin C in the morning and peptides in the evening.

Does vitamin C cancel out peptides?

Not as a general rule. The well-known caution concerns copper peptides with pure vitamin C, and a broader pH argument that is often stretched too far. If it still bothers you, separate them by time of day.

Which should I start with if I can only buy one?

Start with what you want to change. For brighter, more even-looking skin, begin with vitamin C and give it 4–6 weeks. For smoother, firmer-looking skin, begin with peptides and commit to 8–12 weeks.

Do I need a separate hyaluronic acid serum as well?

Usually not. Both of these serums already contain hyaluronic acid, so a third serum adds steps rather than results. Put the effort into a moisturiser that holds everything in place.

Can I use peptides in the morning?

Yes. Our peptide serum's directions are morning and evening. The evening-only option simply keeps the morning short and leaves room for vitamin C and sunscreen.

Last reviewed: October 2026.