Best SkinCeuticals Vitamin C Serum for Dull, Uneven Skin Tone
If your skin looks dull or patchy rather than deeply pigmented, the SkinCeuticals serum that helps improve the appearance of tone evenness fastest is usually Phloretin CF, thanks to its 2% phloretin — the range's most discolouration-focused ingredient. C E Ferulic is the better choice if fine lines and firmness matter as much as tone, Serum 10 AOX+ suits sensitive or first-time users, and Silymarin CF is worth considering if oiliness or blemishes are also part of the picture.
Why SkinCeuticals has five vitamin C serums, not one
SkinCeuticals built its reputation on the Duke Antioxidant Patent formulation — pure L-ascorbic acid, vitamin E and ferulic acid at a low, stable pH — but it sells that technology across five different serums, each tuned to a different skin type and concern. That range is a common source of confusion: two products can share "CF" in the name and still be formulated for opposite skin types. This page is brand-scoped to SkinCeuticals; if you want a wider comparison across other vitamin C brands stocked at Skintique, see our best vitamin C serums UK guide instead.
Compare the five serums at a glance
| Serum | Key actives | Texture | Best suited to |
|---|---|---|---|
| C E Ferulic | 15% L-ascorbic acid, 1% vitamin E, 0.5% ferulic acid | Lightweight, fast-absorbing liquid | Normal, dry or sensitive skin; ageing plus dullness |
| Phloretin CF | 10% L-ascorbic acid, 2% phloretin, 0.5% ferulic acid | Lightweight fluid | Normal, oily or combination skin; discolouration and uneven tone |
| Phloretin CF Gel | 10% L-ascorbic acid, 2% phloretin, 0.5% ferulic acid | Oil-free gel | Normal, combination or oily skin wanting a gel finish |
| Silymarin CF | 15% L-ascorbic acid, 0.5% silymarin, 0.5% ferulic acid, 0.5% salicylic acid | Oil-free, matte-finish fluid | Oily, combination or blemish-prone skin |
| Serum 10 AOX+ | 10% L-ascorbic acid, 0.2% ferulic acid | Lightweight, fragrance-free liquid | All skin types, including sensitive; entry-level vitamin C |
C E Ferulic
C E Ferulic pairs 15% L-ascorbic acid with 1% vitamin E and 0.5% ferulic acid — the highest vitamin C concentration in the SkinCeuticals daytime range. It's formulated for normal, dry and sensitive skin, and it's the one to reach for if your brief is dullness and early ageing together rather than tone alone. The texture is watery and fast-absorbing, with the faint metallic scent typical of high-strength L-ascorbic acid formulas. Read the full C E Ferulic review for application notes and how it layers under SPF.
Phloretin CF
Phloretin CF drops the vitamin C to 10% but adds 2% phloretin alongside 0.5% ferulic acid. Phloretin is the ingredient that sets this serum apart from C E Ferulic, and it's why we lead with Phloretin CF for dull, uneven-toned skin specifically. It's formulated for normal, oily, combination and ageing skin, and some users notice mild tingling on first application, which is typical of higher-acidity vitamin C serums and usually settles with regular use. Full detail in the Phloretin CF review.
Phloretin CF Gel
Same actives as Phloretin CF — 10% L-ascorbic acid, 2% phloretin, 0.5% ferulic acid — in an oil-free gel base rather than a fluid serum. If you like the Phloretin CF formula but find traditional vitamin C serums too heavy, or you have normal-to-oily skin that prefers a gel finish, this is the format to choose. See the Phloretin CF Gel review for how the texture compares to the original.
Silymarin CF
Silymarin CF is built for oily and blemish-prone skin: 15% L-ascorbic acid, 0.5% silymarin (milk thistle extract), 0.5% ferulic acid and 0.5% salicylic acid in an oil-free, matte-finish formula. If dullness or uneven tone shows up alongside breakouts or visible oiliness, this is the serum worth considering over Phloretin CF, since the salicylic acid content also targets pores and congestion. More in the Silymarin CF review.
Serum 10 AOX+
Serum 10 AOX+ is the gentlest entry point into the range: 10% L-ascorbic acid with a lower 0.2% ferulic acid, in a fragrance-free, paraben-free formula suited to all skin types including sensitive skin. It's positioned by SkinCeuticals as an introduction to vitamin C therapy rather than the strongest option, so if you're new to vitamin C serums or your skin reacts easily, start here rather than with C E Ferulic or Phloretin CF. Details in the Serum 10 AOX+ review.
C E Ferulic vs Phloretin CF: which should you pick?
These two get confused most often because they're priced and positioned similarly. The short version: C E Ferulic carries more vitamin C (15% vs 10%) and adds vitamin E, making it the stronger all-round antioxidant and ageing-prevention pick for normal, dry or sensitive skin. Phloretin CF trades some vitamin C strength for 2% phloretin, which is the more discolouration-focused formula and suits normal, oily or combination skin. If tone evenness is your main concern, lead with Phloretin CF; if ageing and firmness matter equally, lead with C E Ferulic. We've broken this down in full in our C E Ferulic vs Phloretin CF comparison.
How to use a SkinCeuticals vitamin C serum
Apply a few drops to clean, dry skin each morning, before moisturiser and always before SPF — vitamin C serums are daytime antioxidant products, not sunscreen replacements. Introduce any high-strength L-ascorbic acid serum gradually if you're new to the ingredient, patch-testing first. Store the bottle away from direct light and heat, and expect the formula's colour to darken slightly with age and light exposure as the vitamin C oxidises; a serum that has turned noticeably dark brown is past its best and should be replaced.
Frequently asked questions
What's the difference between SkinCeuticals C E Ferulic and Phloretin CF?
C E Ferulic uses 15% L-ascorbic acid with vitamin E for normal, dry or sensitive skin focused on ageing and dullness. Phloretin CF uses 10% L-ascorbic acid with 2% phloretin for normal, oily or combination skin focused on discolouration and uneven tone.
Which SkinCeuticals vitamin C serum is best for dull skin?
Phloretin CF is our lead pick for dullness and uneven tone specifically, because its phloretin content is the range's most tone-focused ingredient. C E Ferulic is a strong alternative if ageing prevention matters equally.
Can I use a SkinCeuticals vitamin C serum on sensitive skin?
Serum 10 AOX+ is formulated as the gentlest option in the range, with a lower ferulic acid concentration and a fragrance-free, paraben-free formula. Patch-test any new vitamin C serum before applying it to your full face.
Do I still need SPF if I use a vitamin C serum?
Yes. Vitamin C serums are antioxidants that help improve the appearance of environmental skin stress, not a substitute for sun protection. Apply SPF over the top every morning, regardless of which SkinCeuticals serum you use.
Can I use SkinCeuticals vitamin C serum if I'm pregnant or breastfeeding?
If you're pregnant or breastfeeding, please contact our team for advice before use.