What Makes SkinCeuticals Antioxidant Serums Clinically Different?
Both CE Ferulic and Phloretin CF are formulated according to the Duke antioxidant patent, a set of criteria developed through research by Dr Sheldon Pinnell at Duke University that defines the conditions required for L-ascorbic acid to achieve dermal penetration and meaningful photoprotective activity. These criteria include a specific pH range (3.5 or below), a minimum effective concentration of L-ascorbic acid, and the inclusion of stabilising co-antioxidants.
This formulation approach helps explain why SkinCeuticals antioxidant serums are often recognised for their strong clinical backing. For customers looking for daily antioxidant protection with added support for visible signs of skin ageing, that research-led formulation can make a meaningful difference. The distinction matters for those seeking dermal-level photoprotection and collagen support, rather than surface-level antioxidant activity.
CE Ferulic: Formulation and Clinical Profile
CE Ferulic contains 15% L-ascorbic acid combined with 1% alpha-tocopherol (vitamin E) and 0.5% ferulic acid, formulated at a pH of approximately 2.5 to 3.0 to ensure L-ascorbic acid stability and dermal absorption. At this concentration and pH, the formulation has the most robust clinical evidence base for reducing UV-induced free radical damage, supporting collagen synthesis and improving visible photodamage over time.
Ferulic acid doubles the photoprotective efficacy of vitamins C and E when combined - a finding central to the CE Ferulic formula. This synergistic effect also improves the stability of L-ascorbic acid, extending the effective shelf life of the serum and reducing the risk of oxidative degradation.
Phloretin CF: Formulation and Clinical Profile
Phloretin CF uses a lower concentration of L-ascorbic acid (10%) combined with 0.5% ferulic acid and 2% phloretin, a polyphenol derived from apple with documented antioxidant and anti-glycation activity. The formulation is lighter in texture and has a slightly higher pH, making it better tolerated by oily, combination and blemish-prone skin types.
The inclusion of phloretin targets pigmentation-driving oxidative processes that CE Ferulic does not address as directly. For skin with existing visible pigmentation alongside free radical concerns, Phloretin CF offers a more targeted option than simply reducing to a lower vitamin C concentration.
Side-by-Side Comparison
| Feature | CE Ferulic | Phloretin CF |
|---|---|---|
| L-Ascorbic Acid Concentration | 15% | 10% |
| Additional Antioxidants | Vitamin E (1%), Ferulic Acid (0.5%) | Phloretin (2%), Ferulic Acid (0.5%) |
| Approximate pH | 2.5 to 3.0 | 3.0 to 3.5 |
| Texture | Water-based, slight viscosity | Lightweight, fluid |
| Best Skin Types | Normal, dry, mature | Oily, combination, blemish-prone |
| Primary Benefit | Photoprotection and collagen support | Antioxidant protection with pigmentation targeting |
| Sensitive Skin Suitability | With caution due to lower pH | More suitable for sensitivity-prone skin |
Which Should You Choose?
CE Ferulic is suited to:
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Skin that is normal to dry and tolerates low-pH formulations well.
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Primary concerns of visible photodamage, fine lines and collagen support.
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Those who prioritise the most extensively studied antioxidant serum in the non-prescription category.
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Mature skin where anti-ageing efficacy is prioritised above tolerability.
Phloretin CF is suited to:
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Oily, combination or blemish-prone skin types.
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Those who experience sensitivity or irritation with high-concentration L-ascorbic acid serums.
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Visible pigmentation alongside free radical protection as a concern.
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Those who prefer a lighter serum texture that sits comfortably under daily SPF and makeup.
Can Both Serums Be Used?
Some people choose to use CE Ferulic on days requiring maximum antioxidant and photoprotective coverage and Phloretin CF on days when a lighter formula is preferred. For most, one serum used consistently will deliver better results than alternating between both. Consistency of application is more clinically significant than the choice between the two formulations.
Explore SkinCeuticals antioxidant serums at SKINSTATION
The following options are available at SKINSTATION as part of a targeted antioxidant skincare routine.
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