Amazon UK Comparison
SkinCeuticals C E Ferulic combines 15% L-ascorbic acid, 1% vitamin E and 0.5% ferulic acid. If you want a lower cost option sold on Amazon UK, these three products make different compromises rather than pretending to be identical.

SkinCeuticals lists 15% L-ascorbic acid, 1% alpha tocopherol and 0.5% ferulic acid. That combination is the benchmark here. The alternatives below are compared against those headline actives and their overall format, not treated as identical formulas.
| Product | Vitamin C | Main difference |
|---|---|---|
| Geek & Gorgeous C-Glow | 15% L-ascorbic acid | Closest pure vitamin C strength, water-light and short shelf life |
| e.l.f. Bright Icon | 15% vitamin C | Publishes 1% vitamin E and 0.5% ferulic acid too, but formula differs |
| CeraVe Skin Renewing Vitamin C | 10% L-ascorbic acid | More hydration support from ceramides, hyaluronic acid and B5 |
Closest on the headline active format

C-Glow uses 15% L-ascorbic acid with ferulic acid and vitamin E in a water-light formula. It is the closest of these Amazon UK options to the original's pure vitamin C strength, but the delivery system and supporting ingredients are different.
Closest headline percentages

e.l.f. publishes the same headline percentages of vitamin C, vitamin E and ferulic acid as C E Ferulic. The full formula is not identical, so treat it as a lower cost alternative rather than a like for like replacement.
If the main reason you like C E Ferulic is the 15% pure L-ascorbic acid format, Geek & Gorgeous C-Glow is the most direct starting point of these three. It still uses a different solvent and delivery system, and Geek & Gorgeous recommends refrigeration because the formula has a short shelf life.
If the headline 15% vitamin C, 1% vitamin E and 0.5% ferulic acid percentages are what matter most to you, e.l.f. Bright Icon is the obvious comparison. Its full ingredient list is different, so the shared percentages do not make the products interchangeable.
CeraVe is the least direct match but potentially the better choice if you would rather have 10% pure vitamin C alongside ceramides, hyaluronic acid and vitamin B5.
Two vitamin C serums can share the same headline antioxidant ingredients and still behave differently because the solvent system, pH, packaging, supporting ingredients and texture all matter. The useful question is therefore not which bottle is identical, but which tradeoff matters least to you.