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Best vitamin C serum (UK)

Vitamin C is one of the best-studied ingredients for brightness and uneven tone, but formulas vary a lot in which form they use and how stable they are. Here are the three we recommend.

Our top 3 picks

Entry · Best Overall · Luxury — ranked by the Selenssa Score.

Entry

92
Safe / Clean
The Ordinary Ascorbyl Glucoside Solution 12%

The Ordinary

Ascorbyl Glucoside Solution 12%

£12.70

4.4 (1,850 reviews)

Provisional Selenssa Score 92/100 · A strong affordable option

A stable, water-soluble vitamin C derivative that offers gentle brightening without the irritation or rapid oxidation associated with pure L-ascorbic acid. It is an affordable and low-risk option for gradually restoring natural radiance.

Key actives

Ascorbyl Glucoside (12%)

  • Fragrance-free
  • Alcohol-free
  • Vegan & Cruelty-free
  • Oil-free
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Best Overall

88
Safe / Clean
Medik8 C-Tetra Lipid Vitamin C Radiance Serum

Medik8

C-Tetra Lipid Vitamin C Radiance Serum

£39.00

4.7 (4,200 reviews)

Provisional Selenssa Score 88/100 · The strongest balance of formula, performance and value

Formulated with ultra-stable, lipid-soluble vitamin C, this lightweight serum penetrates deeply to effectively target dullness and uneven tone while nurturing the skin barrier. It delivers noticeable glow with minimal sensitivity.

Key actives

Tetrahexyldecyl Ascorbate (7%), Vitamin E

  • Fragrance-free
  • Paraben-free
  • Artificial dye-free
  • Vegan
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Luxury

88
Safe / Clean
SkinCeuticals C E Ferulic Serum

SkinCeuticals

C E Ferulic Serum

£165.00

4.6 (3,450 reviews)

Provisional Selenssa Score 88/100 · A premium option where the extra spend may be justified

Backed by rigorous, peer-reviewed clinical research, this synergistic patented formulation offers gold-standard antioxidant protection and highly effective brightening, visibly fading dark spots and boosting overall skin luminosity.

Key actives

L-Ascorbic Acid (15%), Alpha Tocopherol (1%), Ferulic Acid (0.5%)

  • Paraben-free
  • Alcohol-free
  • No synthetic fragrances
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What to look for

  • A clearly stated form of vitamin C (L-ascorbic acid, ascorbyl glucoside, tetrahexyldecyl ascorbate)
  • Opaque or airtight packaging to slow oxidation
  • Supporting antioxidants such as vitamin E and ferulic acid
  • Gentler derivatives if your skin is sensitive

See the full guide for brightening or how we score.

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Frequently asked questions

Should I use vitamin C in the morning or at night?

Most people use it in the morning under sunscreen, where its antioxidant benefit pairs well with SPF.

Can I use vitamin C with niacinamide?

Yes. Modern formulas can be used together; if your skin feels irritated, apply them at different times of day.

How do I know my vitamin C serum has gone off?

L-ascorbic acid serums that turn dark orange or brown have oxidised and are less effective.

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