C-Glow
Reviewed by SerumTruth Editorial · Price and formula checked July 2026
A genuine C, E and ferulic serum for a fraction of the prestige price, doing the well-evidenced antioxidant job without frills. The amber dropper still browns over time like any L-ascorbic acid serum. For the money it is one of the easiest vitamin C picks to recommend.
- Cheap to use, about $10 a month
- Evidence24 / 30
Strength of the research behind the key actives
- Vitamin C (L-Ascorbic Acid): strong evidence
- Ferulic Acid: moderate evidence
- Vitamin E (Tocopherol): moderate evidence
The average of the key actives’ evidence grades.
- Potency21 / 25
Dosed at studied levels, not fairy-dusted
- Vitamin C (L-Ascorbic Acid) (15%): dosed at a studied level
- Ferulic Acid: dosed at a studied level
- Vitamin E (Tocopherol): dosed at a studied level
How strongly the actives are dosed, led by the strongest, not how many there are.
- Delivery & stability12 / 20
Delivery tech + packaging that protects fragile actives
- Delivery: standard
- Packaging: tinted glass
- Air- or light-sensitive actives (Vitamin C (L-Ascorbic Acid), Ferulic Acid, Vitamin E (Tocopherol)), so packaging is scored.
Delivery tech plus packaging, and packaging only counts when actives are fragile.
- Formulation7 / 10
Disclosure, active breadth, and ingredient generation
- 1 of 3 actives disclose a concentration
- 3 key actives (breadth credit caps at 3)
- Current-generation or synergistic: Vitamin C (L-Ascorbic Acid), Ferulic Acid, Vitamin E (Tocopherol)
Disclosure, active breadth, and current-generation or synergistic actives.
- Value14 / 15
What a month of use costs vs. the category
- About $10 per month to use
- $16 for 30 ml, used about twice a day (about 0.3 ml each time), so a bottle lasts about 1.7 months
What a month of use costs: full marks at $6 a month or less, the floor at $60 a month or more.
Tap any row to see how its score was built.
Ranks #4 of 27 vitamin c & antioxidants serums we have scored.
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What’s inside
| Active | Disclosed | Dose |
|---|---|---|
| Vitamin C (L-Ascorbic Acid) | 15% | Studied |
| Ferulic Acid | n/a | Studied |
| Vitamin E (Tocopherol) | n/a | Studied |
A water-light 15% L-ascorbic acid serum with ferulic acid and vitamin E, in a dark amber glass dropper. It is a proper C, E and ferulic antioxidant trio at a budget price, with the same low pH and the same oxidation clock as pricier versions once opened. Store it cool and use it within a few months.
How it’s delivered
Air- and light-sensitive actives (vitamin C, copper peptides) lose potency fast in the wrong packaging, so delivery and the bottle are scored, not just what’s on the label.
The actives, explained
What the research says
A 6-month double-blind trial found topical vitamin C linked to a better looking global appearance of photoaged skin versus placebo.
Topical ascorbic acid on photoaged skin. Clinical, topographical and ultrastructural evaluation: double-blind study vs. placebo. Experimental Dermatology, 2003. PubMed ↗
Adding ferulic acid to a vitamin C and E solution stabilized the formula and roughly doubled its measured photoprotection for skin.
Ferulic acid stabilizes a solution of vitamins C and E and doubles its photoprotection of skin. Journal of Investigative Dermatology, 2005. PubMed ↗
A study of the active, not this exact product. What matters for the score is whether this serum uses it at a comparable dose.
Higher-scoring alternatives
Same category, better SerumProof score. Worth a look before you buy.
Revision history
- July 11, 2026Price and formula rechecked
- July 10, 2026Review published
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Cosmetic information for general education, not medical advice. The SerumProof score reflects our reading of publicly available research and formulation disclosures. See how scoring works.