C.E.O. 15% Vitamin C Brightening Serum
Reviewed by SerumTruth Editorial · Price and formula checked July 2026
A well-packaged, disclosed 15% of a stable vitamin C ester for skin that finds L-ascorbic acid too sharp. The derivative carries a thinner evidence record than pure vitamin C, and you pay a prestige price for one active. On comfort and packaging it is a strong pick.
- Every active discloses its concentration
- Air- or light-sensitive actives in protective, opaque packaging
- Costly to use, about $51 a month
- Evidence21 / 30
Strength of the research behind the key actives
- Tetrahexyldecyl Ascorbate: moderate evidence
The average of the key actives’ evidence grades.
- Potency21 / 25
Dosed at studied levels, not fairy-dusted
- Tetrahexyldecyl Ascorbate (15%): dosed at a studied level
How strongly the actives are dosed, led by the strongest, not how many there are.
- Delivery & stability16 / 20
Delivery tech + packaging that protects fragile actives
- Delivery: standard
- Packaging: airless, opaque
- Air- or light-sensitive actives (Tetrahexyldecyl Ascorbate), so packaging is scored.
Delivery tech plus packaging, and packaging only counts when actives are fragile.
- Formulation8 / 10
Disclosure, active breadth, and ingredient generation
- 1 of 1 actives disclose a concentration
- 1 key active (breadth credit caps at 3)
- Current-generation or synergistic: Tetrahexyldecyl Ascorbate
Disclosure, active breadth, and current-generation or synergistic actives.
- Value5 / 15
What a month of use costs vs. the category
- About $51 per month to use
- $85 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.
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Ranks #16 of 27 vitamin c & antioxidants serums we have scored.
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What’s inside
| Active | Disclosed | Dose |
|---|---|---|
| Tetrahexyldecyl Ascorbate | 15% | Studied |
15% tetrahexyldecyl ascorbate, an oil-soluble, more stable vitamin C ester, disclosed at 15%, in an opaque bottle with a pump. THD ascorbate is gentler and less pH-fussy than L-ascorbic acid, and the opaque pump suits an oil-phase active that can still oxidise. It is a single vitamin C active rather than a full antioxidant network.
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 serum with this vitamin C ester was linked to a visibly more even tone and less visible sun damage in photographic assessment.
Hydroquinone-Free, Tetrahexyldecyl Ascorbate Antioxidant Serum for Hyperpigmented and Photodamaged Skin to Achieve Skin Health. Journal of Cosmetic Dermatology, 2026. 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.