Cosrx The Vitamin C 23 Serum 20ml

The COSRX Vitamin C 23 Serum is for people who want vitamin C at full strength. At 23% pure L-ascorbic acid, it sits at the potent end of the spectrum — a results-focused brightening serum aimed at dullness, dark spots, and uneven tone. It is effective, but that strength comes with a learning curve, so it rewards a careful, gradual approach rather than diving straight in daily.

What you are working with

Pure L-ascorbic acid is the most studied form of vitamin C for supporting a brighter, more even-looking complexion and defending skin against daily environmental stress. At 23% it can tingle, particularly at first, which is normal but a sign to ease in. This is best suited to resilient skin already comfortable with active ingredients, not a first vitamin C.

Introduce it slowly

Start two or three mornings a week, a few drops on clean skin before moisturiser, and build up as your skin adjusts. Always follow with sunscreen — vitamin C and daily SPF work together, and protection matters under Bangladesh's strong sun. Avoid layering it with strong acids or retinol in the same routine step, and patch test before the first full use.

Check on Delivery: Inspect the product carefully when you receive your order. Packaging can vary between batches while the product remains the same original item.

Storage: Store in a cool, dry place away from direct sunlight. Keep out of reach of children. Check expiry date on packaging before use.

Patch Test: If you have sensitive skin, apply a small amount to your inner wrist and wait 24 hours before full use. Stop use if irritation occurs.

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