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COSRX Pure Vitamin C 23 Serum 20ml
Vitamin C is one of the most researched and widely validated brightening actives in skincare — but not all Vitamin C serums are equal. The active form that actually works is L-ascorbic acid (pure Vitamin C), and its effectiveness depends heavily on concentration. COSRX Pure Vitamin C 23 Serum 20ml delivers a high-potency 23% L-ascorbic acid in a K-beauty formulation designed to address hyperpigmentation, dullness, fine lines, and antioxidant defence in one targeted step.
COSRX, known for its science-backed Korean skincare philosophy, makes this a particularly well-crafted high-strength formula — cushioned by Allantoin and Panthenol to reduce the irritation that pure ascorbic acid at high concentrations can cause.
Key Ingredients
- L-Ascorbic Acid (23%): The gold-standard form of Vitamin C — inhibits melanin synthesis to fade dark spots and hyperpigmentation, stimulates collagen production to firm skin and reduce fine lines, and neutralises free radicals to protect against premature aging.
- Allantoin: Soothes and calms the skin, reducing the potential irritation associated with high-concentration Vitamin C use.
- Panthenol (Pro-Vitamin B5): Hydrates and supports the skin's repair process, counterbalancing any dryness the ascorbic acid may cause.
What COSRX Vitamin C 23 Targets
- Hyperpigmentation — post-acne marks, sun spots, melasma
- Uneven skin tone and dull, lacklustre complexion
- Fine lines and early wrinkles through collagen stimulation
- Environmental damage — free radical neutralisation as a morning antioxidant
- Skin texture — smoother, more refined surface with regular use
Key Considerations for 23% Vitamin C
At 23% concentration, this is a high-strength Vitamin C serum. It will deliver results more quickly than lower concentrations, but may cause initial tingling, sensitivity, or a slight yellow tint on skin (normal for ascorbic acid). New users should:
- Start with 2–3 times per week and build up
- Always pair with SPF the following morning
- Patch test before first use
Browse our complete Vitamin C serums collection at Derma.pk. For brightening skincare, see our dark spot correctors and dull skin treatments. For anti-aging partners, explore our anti-aging range. For all face serums, browse face serums and treatments.
Usage & Benefits
23% L-ascorbic acid inhibits melanin production to fade dark spots and hyperpigmentation
Brightens and evens skin tone for a more radiant, luminous complexion
Stimulates collagen synthesis to reduce fine lines and improve firmness
Powerful antioxidant protection against free radicals and environmental damage
Allantoin soothes and calms skin to reduce high-concentration Vitamin C irritation
Panthenol hydrates and supports skin repair
Improves overall skin texture and surface smoothness
K-beauty science-backed formula with targeted efficacy
Compact 20ml size — concentrated formula goes a long way
How To Use
Use in the morning (Vitamin C as an antioxidant pairs best with daytime protection).
Apply to cleansed, dry skin before moisturizer and SPF.
Dispense 2–3 drops and press gently into face and neck, avoiding the eye area.
New users: start with 2–3 times per week, gradually increasing to daily use as skin adjusts.
Always follow with a broad-spectrum SPF 30+ sunscreen in the morning.
Allows any slight tingling on first use — this is normal for high-strength Vitamin C.
FAQs
Is 23% Vitamin C too strong for sensitive skin?
It is a high-concentration formula. The inclusion of Allantoin and Panthenol helps buffer irritation, but sensitive skin users should patch test and start slowly (2–3x per week).
Why does my skin turn slightly yellow after applying?
This is normal for pure L-ascorbic acid serums — the slight yellow tint is the ascorbic acid oxidising on the skin surface. It typically fades quickly.
What size is this product?
The handle does not include a size, but this is the COSRX Pure Vitamin C 23 Serum in the standard 20ml size.
Does Vitamin C increase sun sensitivity?
Pure L-ascorbic acid can mildly increase photosensitivity. Always wear SPF 30+ the day after (or during morning use).
Can I use this with retinol or AHA/BHA?
It is generally recommended not to layer Vitamin C with retinol or acids in the same application. Use Vitamin C in the morning and retinol or acids at night.
