Cosrx The Vitamin C 23 Serum , 20ml

Brighten and transform your skin with the COSRX The Vitamin C 23 Serum, a high-potency vitamin c serum formulated with 23% pure Vitamin C to deliver visible results. This intensive serum is designed to target stubborn dark spots, acne marks, and uneven skin tone for a clearer, more radiant complexion.

With its concentrated formula, this vitamin c serum works deeply to reduce pigmentation and improve skin brightness while supporting smoother and firmer-looking skin. It also helps boost overall skin vitality, making dull and tired skin look refreshed and energized.

Despite its powerful strength, the formula is balanced with hydrating and soothing ingredients to minimize irritation and keep the skin comfortable. The lightweight texture absorbs quickly, allowing the vitamin c serum to work effectively without leaving a heavy or sticky feel.

Ideal for those looking for stronger brightening care, this serum is best suited for experienced users who want fast and noticeable improvements in skin tone and texture.

Key Features:

• High-strength vitamin c serum with 23% pure Vitamin C
• Targets dark spots, acne scars, and uneven skin tone
• Enhances skin brightness and radiance
• Helps improve skin texture and firmness
• Fast-absorbing formula with minimal residue

Upgrade your routine with this powerful vitamin c serum for visibly brighter, smoother, and healthier-looking skin.

FAQs

What skin concerns does it address?

Hyperpigmentation, acne scars, dullness, uneven skin tone, fine lines, and loss of elasticity .

What skin type is it for?

Ideal for mature, dull, or dehydrated skin. It is not recommended for beginners due to its high concentration, but it can work for all skin types, including some sensitive skin .

What is the texture like?

It has a dual-layer formula with an oil layer on top of the serum to prevent oxidation. It feels smooth and absorbs quickly .

Does it have a smell?

Yes, users consistently report a strong, unpleasant odor often compared to "hot dog water" or "gas." The smell dissipates quickly after application .

How do I use it?

Apply 2-3 drops to clean, toned skin. Gently pat until absorbed. Follow with moisturizer and SPF during the day .

How often should I use it?

Start with 2-3 times a week in the evening. If well-tolerated, increase to daily use either morning or night .

Do I need sunscreen with it?

Yes! Vitamin C enhances sun protection but doesn't replace SPF. Always use sunscreen daily .

How should I store it?

Store in the refrigerator (3–10°C) in a cool, dark place to maintain potency and prevent oxidation .

How long does it last before oxidizing?

The serum can oxidize within 2 months. Oxidation occurs when it turns dark yellow or brown and loses effectiveness .

Is it suitable for sensitive skin?

Mixed reviews. Some sensitive skin users find it tolerable, others report allergic reactions and itching. Patch test first .

Can I use it with retinol?

It is recommended to avoid using this serum with other high-concentration actives like retinol. Use them at different times of day .

Does it help with acne scars?

Yes! Users report significant fading of acne scars, with one reviewer noting 55% improvement in just 2 weeks .

Can I use it with other Vitamin C products?

The serum already contains 23% pure Vitamin C, so additional Vitamin C products are unnecessary and may cause irritation.

Is it vegan and cruelty-free?

COSRX is a cruelty-free brand. Check the packaging for specific vegan certification.

Does it have a sticky feel?

Some users find it slightly sticky, especially if applied too heavily. Gently patting, rather than rubbing, helps absorption .

Where is it manufactured?

This product is manufactured in South Korea .

What size is this product?

The product comes in a 20ml bottle .