SkinCeuticals Phloretin CF Review

SkinCeuticals Phloretin CF is a morning-use vitamin C serum combining 10% L-Ascorbic Acid, 2% phloretin and 0.5% ferulic acid, formulated for combination, oily and discolouration-prone skin. It's designed to help improve the appearance of uneven tone and environmental damage, and sits as the brand's go-to alternative to C E Ferulic for skin that runs oilier rather than dry.

What is SkinCeuticals Phloretin CF?

Phloretin CF is a 30ml fluid-texture antioxidant serum from SkinCeuticals' core AM range, formulated under the brand's Duke Antioxidant Patent. Its three headline actives are 10% L-Ascorbic Acid (pure vitamin C), 2% phloretin and 0.5% ferulic acid, formulated at an acidic pH of 2.0–3.5 to support delivery of the vitamin C into skin. SkinCeuticals states that once absorbed, the serum remains active in skin for a minimum of 72 hours, which is why it's a once-daily rather than a reapply-through-the-day product.

It sits alongside C E Ferulic as one of the two flagship serums in SkinCeuticals' antioxidant line-up, and shares shelf space with the gel-texture Phloretin CF Gel and the blemish-focused Silymarin CF.

How it works

Vitamin C serums like Phloretin CF work as a leave-on antioxidant layer rather than a treatment that acts overnight. Throughout the day, skin is exposed to free radicals generated by UV rays, pollution and other environmental stressors; a stable, high-strength antioxidant applied in the morning is designed to sit in skin and help neutralise some of that damage as it happens, alongside — not instead of — daily SPF. The reason SkinCeuticals formulates at a low pH (2.0–3.5) is that L-Ascorbic Acid needs an acidic environment to penetrate the skin barrier effectively; this is also why high-strength vitamin C serums can feel sharp or tingly on first use, particularly on skin that hasn't built up tolerance yet. Phloretin, the ingredient that sets this formula apart from C E Ferulic, is a plant-derived antioxidant that SkinCeuticals pairs with vitamin C specifically for its work on uneven tone and discolouration, which is why Phloretin CF is positioned as the sibling serum for combination and oily skin rather than the drier, more mature skin C E Ferulic is built for.

Key ingredients & concentrations

DATA GAP: the product's Shopify listing also cites specific clinical-trial percentages (a 24-week study of 35 subjects, with figures for fine lines, discolouration, tone evenness and dullness). These weren't independently verified against published SkinCeuticals/L'Oréal clinical documentation in this session, so they've deliberately been left out of this page in line with the no-invented-stats rule — only the sourced concentration, pH and 72-hour efficacy facts above are used.

Who it's for

• Normal, oily or combination skin looking for a daily antioxidant serum
• Discolouration, hyperpigmentation, age spots or sun-damage-related uneven tone
• Skin that finds C E Ferulic's texture too rich, or that reacts less well to added vitamin E
• Anyone wanting to layer environmental protection under their existing SPF routine

It's a less obvious fit for dry, sensitive or very reactive skin — that's the profile SkinCeuticals builds C E Ferulic for instead. If active breakouts, rather than the marks or discolouration they leave behind, are your main concern, it's worth asking our team whether Silymarin CF or the Blemish + Age range would suit you better. And if sun damage and uneven tone sit alongside visible fine lines or a loss of firmness, rather than oiliness, it may be worth comparing this against C E Ferulic before deciding, since the two serums are built for genuinely different starting points rather than one being a straightforward upgrade on the other.

How to use it

Phloretin CF is formulated as a once-daily AM step, applied to cleansed, dry skin before moisturiser and daily SPF — it's designed to work alongside sunscreen, not replace it. A few drops is generally enough to cover the face; the fluid texture is designed to absorb quickly and layer under the rest of a morning routine without pilling. Because of the high concentration of L-Ascorbic Acid, some people notice mild tingling on first application; this is a normal response to the acidic pH and typically settles with continued use. If irritation persists, space out applications or seek advice from our team rather than pushing through it. It's also worth patch testing on a small area before working it into a full routine, particularly if you've reacted to vitamin C or acid-based products before. DATA GAP: exact build-up guidance (e.g. alternate-day introduction) wasn't independently re-confirmed against a live metafield pull in this session — check the product packaging or ask our team before starting.

Phloretin CF vs C E Ferulic

Both serums are built on the same Duke Antioxidant Patent backbone of L-Ascorbic Acid and 0.5% ferulic acid, but the third ingredient changes who each is formulated for. C E Ferulic pairs 15% vitamin C with 1% vitamin E for normal, dry, sensitive or ageing skin, while Phloretin CF uses a slightly lower 10% vitamin C alongside 2% phloretin, aimed at normal, oily, combination and discolouration-prone skin. Our full C E Ferulic vs Phloretin CF comparison goes through the difference in detail.

Phloretin CF vs Phloretin CF Gel

SkinCeuticals also sells the same core actives in a gel base: Phloretin CF Gel. The fluid version reviewed here suits normal-to-oily and combination skin, while the gel texture is formulated with oilier and more blemish-prone skin specifically in mind, since a gel base can feel lighter and less likely to contribute to shine over the course of a day. Neither is ‘stronger’ than the other — the difference is texture and skin type fit, not concentration of actives. If shine or congestion through the day is more of an issue for you than general oiliness, the gel is worth comparing before you buy.

Pairing with Silymarin CF and Discolouration Defense Serum

Phloretin CF is designed as a standalone AM antioxidant step, not one to layer with SkinCeuticals' other vitamin C serums — using it alongside Silymarin CF or Discolouration Defense Serum on the same day generally means applying more active ingredient than your skin needs in one routine. Silymarin CF is SkinCeuticals' vitamin C serum built specifically for oily, blemish-prone skin, while Discolouration Defense Serum is a targeted brightening treatment rather than a daily antioxidant serum. If you're not sure which one your skin actually needs, our team can help you choose one rather than combining them.

Safety, sensitivity and pregnancy

Mild tingling on first use is a normal response to the formula's acidic pH and usually settles with continued use; stop and seek advice if irritation is significant or doesn't ease off. DATA GAP: fragrance status and full allergen listing weren't pulled from Shopify metafields in this session, so aren't stated as fact here — check the product packaging or ask our team if you're fragrance-sensitive. If you're pregnant or breastfeeding, please contact our team for advice before use.

Phloretin CF: the verdict

Phloretin CF is a well-formulated antioxidant serum for normal, oily, combination and discolouration-prone skin that wants a lighter vitamin C option than C E Ferulic. It's not built for dry or sensitised skin, and it's a daily-protection serum rather than a spot treatment for active breakouts. For the full picture of where it sits in the range, see our SkinCeuticals brand guide, or our wider guide to the best vitamin C serums in the UK if you're comparing across brands.