Dr. Althea vs. Klairs Vitamin C Serum: Which Is Gentler?

Both are explicitly marketed for vitamin C beginners, but they reach that gentleness through different routes: a stabilized derivative versus pure ascorbic acid kept at a low, mild concentration.

Same intended audience, similar price, but a genuine ingredient-strategy difference: a derivative engineered for stability and gentleness, versus the real, classic vitamin C form kept deliberately mild.

Dr. Althea runs $0.77 per milliliter. Klairs runs $0.57 per milliliter ($20.00 for 35mL). Klairs is meaningfully cheaper per mL.

Dr. Althea builds around 3-O-Ethyl Ascorbic Acid, a stabilized vitamin C derivative, alongside niacinamide and sea buckthorn extract, explicitly marketed for first-time users. Klairs uses pure ascorbic acid at a mild, entry-level 5%, alongside centella asiatica and sodium hyaluronate, a long-standing, consistently-formulated product.

Klairs contains fragrance. Dr. Althea's formula does not carry that same essential-oil fragrance profile. For a genuine first-time actives user who's also fragrance-sensitive, that's a real, practical factor.

If fragrance sensitivity is a concern alongside sensitivity to actives, Dr. Althea's stabilized-derivative approach is the more cautious pick. If you want the most classic, longest-documented pure vitamin C form at the lowest price, and fragrance isn't a dealbreaker, Klairs is the better-value choice.

See our full best Korean serums by concern guide, or browse the rest of our serum coverage.