COSRX · Serum

COSRX The Advanced Vitamin C 23 Serum 7.4 / 10

Reviewed by Michael C.

Import — an international brand sold in South Africa.

COSRX The Advanced Vitamin C 23 Serum is a high-potency facial serum designed to target dullness, uneven skin tone, and early signs of aging. Formulated with pure vitamin C, Super Vitamin E, and Glutathione, this imported formula offers intense brightening and antioxidant support for everyday skinca

This high-potency serum delivers noticeable brightening and antioxidant protection, though its 23 percent pure vitamin C concentration may prove too intense for sensitive skin. At R599, it is a solid imported option provided you store it away from South African heat to prevent oxidation.

COSRX The Advanced Vitamin C 23 Serum provides a high-concentration antioxidant formula aimed at brightening dull complexions and refining uneven skin tone. Featuring a potent 23 percent pure vitamin C alongside Super Vitamin E and Glutathione, the serum works effectively to tackle early signs of aging while providing robust protection against environmental stress. While the results are noticeable, the high concentration of pure ascorbic acid means it may prove too intense for those with sensitive skin types. Users should introduce it gradually and remain aware of potential irritation. Priced at R599, it stands as a solid imported option within the South African market. Given the climate and stability demands of high-percentage vitamin C, proper care is required during storage. Keeping the bottle in a cool place out of direct heat is essential to maintain potency and prevent premature oxidation over time. Overall, it is an effective choice for experienced vitamin C users seeking strong skin-tone support.

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No hype, just evidence — this review is independently researched from publicly available information, ingredient analysis and editorial testing.