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Klairs

Freshly Juiced Vitamin C Drop

$23·35 ml·~$12/mo to use

Reviewed by SerumTruth Editorial · Price and formula checked July 2026

A low-strength, low-drama introduction to L-ascorbic acid for sensitive or first-time users. The 5% dose is gentle by design, so it is a comfort pick rather than a potent one, and the clear packaging means using it fresh matters. For easing in, it does the job at a budget price.

What we like
  • Built on strong-evidence actives
  • Every active discloses its concentration
  • Cheap to use, about $12 a month
Watch-outs
  • Actives sit below their studied doses
  • Fragile actives sit in a clear, exposed package that lets them degrade
SerumProof score70 / 100
  • Evidence30 / 30

    Strength of the research behind the key actives

    • Vitamin C (L-Ascorbic Acid): strong evidence

    The average of the key actives’ evidence grades.

  • Potency14 / 25

    Dosed at studied levels, not fairy-dusted

    • Vitamin C (L-Ascorbic Acid) (5%): present, but below a studied dose

    How strongly the actives are dosed, led by the strongest, not how many there are.

  • Delivery & stability6 / 20

    Delivery tech + packaging that protects fragile actives

    • Delivery: standard
    • Packaging: clear dropper
    • Air- or light-sensitive actives (Vitamin C (L-Ascorbic Acid)), so packaging is scored.

    Delivery tech plus packaging, and packaging only counts when actives are fragile.

  • Formulation6 / 10

    Disclosure, active breadth, and ingredient generation

    • 1 of 1 actives disclose a concentration
    • 1 key active (breadth credit caps at 3)
    • No current-generation or synergy bonus

    Disclosure, active breadth, and current-generation or synergistic actives.

  • Value14 / 15

    What a month of use costs vs. the category

    • About $12 per month to use
    • $23 for 35 ml, used about twice a day (about 0.3 ml each time), so a bottle lasts about 1.9 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 #18 of 27 vitamin c & antioxidants serums we have scored.

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What’s inside

ActiveDisclosedDose
Vitamin C (L-Ascorbic Acid)5%Light

A gentle 5% L-ascorbic acid serum in a light, extract-heavy base, with a stabilisation claim, in a clear glass dropper. 5% is a starter-level dose, well below the studied 10 to 20% range, aimed at skin easing into vitamin C. It is not fairy-dusted, just deliberately low, and the clear dropper is a weak point for an acid that oxidises.

How it’s delivered

DeliveryStandardPackagingClear dropper

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 ↗

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
  1. July 11, 2026
    Price and formula rechecked
  2. July 10, 2026
    Review 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.