15% Vitamin C + Clean Caffeine Energy Serum
Reviewed by SerumTruth Editorial · Updated July 2026
A gentler, ester-based route to a 15%-labeled vitamin C serum, with two well-placed derivatives doing the real work and a fashionable caffeine story riding along for the appearance of brighter, less puffy-looking mornings. It skips the sting and the fast browning of straight L-ascorbic acid, at the cost of a thinner direct evidence record than the classic high-dose acid formulas. Priced for the derivative approach and the brand, not for raw acid concentration.
- Evidence21 / 30
Strength of the research behind the key actives
- Ethyl Ascorbic Acid: moderate evidence
- Tetrahexyldecyl Ascorbate: moderate evidence
- Sodium Ascorbyl Phosphate: moderate evidence
The average of the key actives’ evidence grades.
- Potency19 / 25
Dosed at studied levels, not fairy-dusted
- Ethyl Ascorbic Acid: dosed at a studied level
- Tetrahexyldecyl Ascorbate: dosed at a studied level
- Sodium Ascorbyl Phosphate: below the 1% line, treated as fairy-dusted
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 (Tetrahexyldecyl Ascorbate), so packaging is scored.
Delivery tech plus packaging, and packaging only counts when actives are fragile.
- Formulation5 / 10
Disclosure, active breadth, and ingredient generation
- 0 of 3 actives disclose a concentration
- 3 key actives (breadth credit caps at 3)
- Current-generation or synergistic: Ethyl Ascorbic Acid, Tetrahexyldecyl Ascorbate, Sodium Ascorbyl Phosphate
Disclosure, active breadth, and current-generation or synergistic actives.
- Value7 / 15
What a month of use costs vs. the category
- About $41 per month to use
- $68 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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What’s inside
| Active | Disclosed | Dose |
|---|---|---|
| Ethyl Ascorbic Acid | n/a | Studied |
| Tetrahexyldecyl Ascorbate | n/a | Studied |
| Sodium Ascorbyl Phosphate | n/a | Below 1% line |
A 15% vitamin C complex built from three stabilized derivatives rather than pure L-ascorbic acid. 3-O-ethyl ascorbic acid and tetrahexyldecyl ascorbate lead the ingredient list right after water, a good sign the pair carries most of that 15%, while magnesium ascorbyl phosphate trails much further down, past the caffeine, as a minor third form. The plant-derived caffeine from yerba mate and guayusa is the marketed "energy" hook for the look of morning puffiness, but it has no dedicated evidence dossier in this library. It ships in a tinted glass pump, a sensible if not essential choice, since ester and phosphate vitamin C forms are considerably more air- and light-stable than raw L-ascorbic acid to begin with.
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
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.