COSRX, The Vitamin C 23 Serum

The Vitamin C 23 Serum

Name: The Vitamin C 23 Serum
Brand: COSRX
Price: 24 EUR
Availability: InStock
Rating: 3.67 (3 reviews)

Step 4: Serum

from €24

Punchy 23% L-ascorbic acid serum for serious brightening. Not for sensitive skin, for vitamin C veterans.

Skin types: Normal, Combination, Oily

Targets: Hyperpigmentation, Dull, Melasma

Pros

High-strength vitamin C at a low price
Visible brightening in weeks

Cons

Strong tingle is normal
Oxidizes fast, buy small bottles
Not for beginners

Where to buy

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Editorial verdict

The COSRX The Vitamin C 23 Serum is designed for those serious about addressing hyperpigmentation, dullness, and signs of aging with a potent L-ascorbic acid formulation. Its high concentration means it delivers significant brightening and anti-aging benefits, making it a valuable addition for experienced vitamin C users. However, individuals with sensitive skin or those new to vitamin C should approach with caution due to its high potency. Consistent use, particularly in the morning followed by sunscreen, is crucial for achieving optimal results.

Normal skin

Oily skin

Combination skin

Hyperpigmentation

Dullness

Uneven Skin Tone

Anti-Aging

Dark Spots

What people love and don't

This serum features a high concentration of 23% L-ascorbic acid, leading to significant brightening effects. It is generally recommended for those familiar with vitamin C products due to its potency.

The good

Powerful Brightening

Reviewers frequently highlight the serum's ability to significantly brighten the skin and improve overall radiance, attributing this to its high concentration of L-ascorbic acid. Many users report a visible reduction in dullness.

Effective for Hyperpigmentation

Reviewers commonly report that this serum effectively targets and reduces various forms of hyperpigmentation, including dark spots and acne marks. The potent vitamin C content is cited as the reason for these results.

Visible Anti-Aging Benefits

Users have observed an improvement in the appearance of fine lines and wrinkles, as well as an overall more youthful complexion. The high dose of L-ascorbic acid is known for its antioxidant and collagen-boosting properties.

Reach for it if

Reviewers with experienced vitamin C users seeking potent brightening. It is ideal for those targeting hyperpigmentation, dullness, and signs of aging.

Skip it if

Individuals with sensitive skin or new to vitamin C products should avoid this serum.

What to expect

Significant skin brightening
Reduction of dark spots and hyperpigmentation
Improved skin tone and radiance
Reduced appearance of fine lines and wrinkles
Antioxidant protection against environmental damage

Don't expect

Overnight miracle results
Complete eradication of deep wrinkles
Suitable for highly sensitive skin types
To replace sunscreen

Deep facts

Texture: Viscous liquid
Finish: Radiant
Scent: Unscented
Packaging: Amber glass dropper bottle to protect the vitamin C from light and air.
Value: Given its high concentration of L-ascorbic acid, it offers good value for its brightening and anti-aging benefits.
Time to results: Brightening and anti-pigmentation results can be observed within 4-8 weeks with consistent use, while immediate hydration and glow are often reported sooner.
Usage frequency: Once daily, ideally in the morning.
Routine position: After cleansing and toning, before heavier serums and moisturizers, typically in the AM.
Repurchase signal: No direct repurchase sentiment, but the strong efficacy implies high user satisfaction.

Fragrance freeEssential oil freeAlcohol free

Layering tips

Layer with hydrating serums, but avoid direct layering with retinoids, AHAs, BHAs, and other strong actives to prevent irritation. Always follow with sunscreen in the morning.

Full INCI list

This ingredient list was auto-compiled and may be incomplete or outdated. For allergens, pregnancy or sensitivity checks, verify on the brand's official page.

Ascorbic Acid 23%, Water, Sodium Hyaluronate, Allantoin, Panthenol, Niacinamide.

How to use

Use AM only. Wait 30s after toner, apply a few drops, follow with moisturizer and SPF.

Questions people ask about The Vitamin C 23 Serum

Answered from our enrichment data, not generic boilerplate.

What is The Vitamin C 23 Serum and what does it do?

This serum features a high concentration of 23% L-ascorbic acid, leading to significant brightening effects. It is generally recommended for those familiar with vitamin C products due to its potency.

Is The Vitamin C 23 Serum good for normal, oily and combination skin?

Yes, it tends to suit normal, oily and combination skin. Reviewers with experienced vitamin C users seeking potent brightening. It is ideal for those targeting hyperpigmentation, dullness, and signs of aging.

Who should avoid The Vitamin C 23 Serum?

Individuals with sensitive skin or new to vitamin C products should avoid this serum.

How often should I use The Vitamin C 23 Serum?

Once daily, ideally in the morning.

How long until The Vitamin C 23 Serum shows results?

Brightening and anti-pigmentation results can be observed within 4-8 weeks with consistent use, while immediate hydration and glow are often reported sooner.

What can I layer The Vitamin C 23 Serum with?

Layer with hydrating serums, but avoid direct layering with retinoids, AHAs, BHAs, and other strong actives to prevent irritation. Always follow with sunscreen in the morning.

Is The Vitamin C 23 Serum worth the price?

Given its high concentration of L-ascorbic acid, it offers good value for its brightening and anti-aging benefits.

Is The Vitamin C 23 Serum suitable for sensitive skin?

The Vitamin C 23 Serum is fragrance-free, free of essential oils and alcohol-free, which makes it a safer pick for reactive or barrier-impaired skin. Always patch test before using it on the full face.

Where to buy

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