

COSRX The Vitamin C 23% Serum - 20ml
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✓ 30-day returns on unopened items · 24,000+ customers since 2021
A high-strength serum with 23% pure vitamin C that brightens and evens the look of tone. 20ml.
COSRX The Vitamin C 23% Serum delivers 23% pure vitamin C (L-ascorbic acid) to brighten the look of dull, uneven skin, help fade the look of dark spots and boost radiance, for a clearer, more even, glowing complexion. A potent daily brightening treatment.
Key details
- Format: high-strength vitamin C serum
- Size: 20ml
- Key ingredient: 23% pure vitamin C (L-ascorbic acid)
- Targets: the look of dark spots, uneven tone and dullness
- Skin type: all; introduce gradually if new to high-strength vitamin C
How to use: In the morning, apply a few drops to clean skin before moisturiser. Always follow with SPF. A slight tingle can be normal; patch-test if sensitive.
Who it's for: Anyone wanting a potent vitamin C brightening serum.
Genuine COSRX. 20ml. Fast, fully tracked UK delivery.
Free UK delivery on orders over £50; £4.95 under £50. Orders are dispatched within 1–3 working days, then take 5–10 working days to arrive in the UK. USA from £6.95; Europe from £9.95; rest of world from £14.95.
30-day returns on unused, unopened products in original packaging. For hygiene reasons, opened beauty products can only be returned if faulty. Email support@glamglobal.com to start a return.
100% Genuine — Guaranteed.
Every product we sell is 100% genuine, sourced from authorised suppliers and brand distributors in South Korea, Japan and the United States. Since 2021, more than 24,000 customers have shopped with GlamGlobal. If anything arrives damaged or faulty, email support@glamglobal.com and we will refund or replace it.
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