The Vitamin C Core Stayed. The Finished Serum Changed.
SkinCeuticals kept C E Ferulic's familiar antioxidant concentrations while adding two ingredients. The update makes formulation stability and new-product evidence the useful questions.
Familiar concentrations, a changed formula
SkinCeuticals updated C E Ferulic in 2026 without changing the concentrations at the centre of its original antioxidant combination: 15% L-ascorbic acid, 1% vitamin E and 0.5% ferulic acid. The company says the new formula adds 0.3% carnosine and 1% Endophytol, its dandelion-root extract. Those are the brand’s disclosed formulation facts, not a measure of how much of each ingredient reaches skin in use. [1, 2]
The choice is commercially clear: keep what users recognise, then extend the product’s stated aims. It is also a development change. Added ingredients may alter the finished formula’s stability, sensory profile and test plan. Continuity in three ingredient concentrations does not mean the whole serum is unchanged.
Separate a formula decision from an efficacy result
SkinCeuticals reports new clinical and appearance claims for the updated product. Its release says the testing results are held on file, while the public announcement does not provide a full protocol and analysis for the claims. They should be identified as brand-reported results rather than treated as independently published evidence. [1]
The useful question for a product team is narrower than “is the new formula better?” Which claimed change was measured, over what use period, and against what comparator? How stable are the actives in the final serum? How does the update affect application and tolerability? A mature ingredient combination can be an important starting point. The revised product still needs its own evidence.