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The Vitamin C Serum on its shelf in the cabinet, in late-morning sun.
What is inside the Vitamin C Serum, close up on limestone.

What it is

Vitamin C that smells of mandarin, not of pennies.

A gentle daily vitamin C: 2% ascorbyl glucoside with 1% ferulic acid and 1% sea buckthorn oil, in an airless pump that keeps it fresh to the last drop. It helps defend skin against everyday environmental stress and brings back the glow tired skin loses. Hyaluronic acid adds moisture; mandarin adds the mood.

  1. Revives a dull, tired-looking complexion
  2. Helps defend against everyday environmental stress
  3. Gentle and stable, no sting
Targets
Dullness, Tired-looking skin, Environmental stress
Suited to
All skin types
Format
Lightweight serum · 30 ml · airless pump
Feel
Light and silky, no tack. Mandarin.

Results

After four weeks

Consumer perception study, 46 participants, 4 weeks

  • 94%said it never stung
  • 91%said skin looked more radiant after 4 weeks
  • 89%said skin looked less tired
Vitamin C Serum, white airless bottle, white pump, in a carton

What is in it

4 that do the work

2% ascorbyl glucoside
A stable, gentle form of vitamin C, an antioxidant
1% ferulic acid
An antioxidant partner that supports vitamin C
1% sea buckthorn oil
Omega-rich oil that softens the skin
Hyaluronic acid
Adds a layer of moisture

How to use it

Mornings, after washing. Two pumps over face and neck, then sun protection.

Size
30 ml · White airless bottle, white pump, in a carton
Certified
COSMOS Natural, the formula's certification
The Facial Wash, Vitamin C Serum, Tinted Sunscreen and Scrub on limestone at midday by the water.

III · The face and sun shelf

A vitamin C that smells of mandarin. We're not going back.

Stylist, 2025
Morning, Sorted: Facial Wash, Vitamin C Serum, Sun Stick

Complete the routine · Staff pick

Morning, Sorted

Wash, vitamin C, SPF50. Out the door in three minutes.

Goes well with

Better together

  • Facial Wash Clean skin first, so the serum goes straight to work
  • Sun Stick Antioxidants under, SPF50 over: the morning double act
The Facial Wash on its shelf

30% offAward winnerReordered every 7 weeks, on average

Facial WashWas US$33, now US$23

Gentle, for Every Day · 145 ml

Clean, never tight

4.7(1,198)
US$23 · 145 ml
The Sun Stick on its shelf

30% offBestsellerSold out twice last June

Sun StickWas US$33, now US$23

SPF50 · Tinted · 12 g

SPF50 for your pocket

4.7(1,109)
US$23 · 12 g

Reviews

What people say

4.61,532 reviews of the Vitamin C Serum

  • 571%
  • 420%
  • 35%
  • 22%
  • 12%

We publish every review, the glowing and the grumpy.

  • Vitamin C without the sting

    Every other vitamin C I've tried tingled and smelled odd. This one smells of mandarin and my skin looks properly awake by about week three.

    Nadia, Manchester · Combination skinVerified buyer

  • Morning ritual approved

    Two pumps after washing, then the Sun Stick. My skin looks less tired, which is more than I can say for me.

    Ben, Oxford · Normal skinVerified buyer

  • Gentle and fresh

    Very gentle and it sits nicely under SPF. The glow builds gradually rather than overnight, so give it a few weeks.

    Yasmin, Leeds · Sensitive skinVerified buyer

Questions

Before you ask

Anything else: a real person answers, usually within the hour.

Why 2% and not 20%?

We use ascorbyl glucoside, a gentle, stable form of vitamin C, with 1% ferulic acid to back it up. The point is a serum you'll use every morning, not one you'll abandon after a week of stinging.

Morning or evening?

Morning, after washing and before SPF, when an antioxidant does the most for the day ahead.

When will it arrive?

Every order is made for you, which takes two working days, and then arrives in four to seven working days in the UK. Delivery is free over £45.

Can I send it back?

Yes, within 60 days, even opened. Write to us and we will tell you how; the refund goes back to the card you paid with.

What is the sample?

Every order brings a small sample from the range, chosen to go with what is in your bag.

How does it go with the rest?

Wash, then vitamin C, then sun protection. The set on this page puts them in your bag together, for less than buying them singly.

What does COSMOS mean?

COSMOS is an independent standard for natural and organic cosmetics: it checks where every ingredient comes from and how the formula is made.

As seen in

  • Vogue
  • ELLE
  • Harper's Bazaar
  • The Times
  • Evening Standard
  • Stylist
  • Refinery29