Products / COSRX / The Vitamin C 23 Serum

The Vitamin C 23 Serum

Name: The Vitamin C 23 Serum
Brand: COSRX

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Serum·Product identity reviewed

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Shelley Nayak · Reviewing 4 Popular Brightening Korean Serum for Dark SpotsDirect recommendation Unclear

Creator rates COSRX The Vitamin C 23 Serum 5/5 and says its 23% pure vitamin C formula did not irritate her with nightly use. She reports gradual fading of mouth pigmentation, brown acne marks, sun tan and unevenness, but says very old dark melasma may not respond. She requires refrigerated storage, discarding when oxidized, and advises sensitive or rosacea skin to avoid it.

Published Nov 21, 2025

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One Eye Beauty · COSRX: The BEST and WORST #cosrxreview #koreanskincareDirect recommendation Affiliate only

Creator calls this her absolute favorite advanced vitamin-C serum and recommends its 23% pure ascorbic acid formula for experienced vitamin-C users seeking effective results.

Published Nov 7, 2024

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