COSRX, The Vitamin C 23 Serum

The Vitamin C 23 Serum

Name: The Vitamin C 23 Serum
Brand: COSRX
Price: 24 EUR
Availability: InStock

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

Shop via partner

Editorial verdict

The COSRX The Vitamin C 23 Serum is a potent antioxidant treatment designed for those seeking significant skin brightening and tone improvement. Its high concentration of 23% L-ascorbic acid, a pure form of Vitamin C, makes it effective for targeting hyperpigmentation and providing environmental protection. While it includes hydrating and soothing ingredients like hyaluronic acid, allantoin, and panthenol to mitigate potential irritation, users new to high-strength vitamin C or with sensitive skin should introduce it cautiously. This serum is best suited for experienced vitamin C users looking for a powerful addition to their routine to achieve a more radiant and even complexion.

Normal skin

Combination skin

Oily skin

Dullness

Hyperpigmentation

Uneven Skin Tone

Antioxidant Protection

What people love and don't

This serum features a high concentration of 23% L-ascorbic acid, a potent form of Vitamin C, combined with hydrating ingredients like hyaluronic acid and soothing panthenol. It is designed to target skin brightening and improve overall skin tone.

The good

Potent Brightening

The high concentration of 23% L-ascorbic acid, a pure and effective form of Vitamin C, is known for its ability to significantly brighten skin tone and reduce the appearance of hyperpigmentation.

Antioxidant Protection

L-ascorbic acid acts as a powerful antioxidant, helping to neutralize free radicals that contribute to premature skin aging and environmental damage.

Hydrating Support

Formulated with sodium hyaluronate and panthenol, the serum also aims to provide hydration and help maintain the skin's moisture barrier, counteracting potential dryness from the active ingredient.

Soothing Ingredients

Ingredients like allantoin and panthenol are included to help soothe the skin and minimize potential irritation from the high concentration of L-ascorbic acid.

The trade-offs

Potential Irritation

The high concentration of 23% L-ascorbic acid can be irritating for sensitive skin types or those unaccustomed to potent vitamin C serums, potentially causing redness or stinging.

Stability Concerns

L-ascorbic acid is inherently unstable and prone to oxidation when exposed to light and air, which can reduce its efficacy over time.

Reach for it if

This serum is best suited for individuals with experience using high-strength vitamin C products, particularly those looking for significant brightening and antioxidant benefits.

Skip it if

Individuals with sensitive skin or those new to vitamin C should approach this product with caution due to its high concentration of L-ascorbic acid.

What to expect

Brighter skin tone
Reduced appearance of hyperpigmentation and dark spots
Improved skin radiance
Antioxidant protection against environmental damage
More even skin complexion

Don't expect

Instantaneous dramatic skin transformation
Significant reduction in deep wrinkles and fine lines on its own
Pore size reduction
Acne treatment

Deep facts

Scent: Unscented, with a natural faint metallic or plastic-like odor sometimes associated with L-ascorbic acid products.
Packaging: Opaque dropper bottle to protect the light-sensitive vitamin C.
Value: Given its high concentration of L-ascorbic acid and supporting ingredients, this serum offers a strong value proposition for those seeking a potent vitamin C treatment.
Time to results: Antioxidant benefits are immediate, but visible brightening and improvement in hyperpigmentation typically take 4 to 6 weeks of consistent use.
Usage frequency: Daily, preferably in the morning, gradually introducing it into the routine.
Routine position: After cleansing and toning, before heavier serums or moisturizers, typically in the AM.

Fragrance freeEssential oil freeAlcohol free

Layering tips

Apply to dry skin to enhance absorption and minimize potential irritation. Avoid layering with other strong actives like AHAs, BHAs, or retinoids, especially initially, to prevent over-exfoliation or irritation.

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?

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

Yes, it tends to suit normal, combination and oily skin. This serum is best suited for individuals with experience using high-strength vitamin C products, particularly those looking for significant brightening and antioxidant benefits.

Who should avoid The Vitamin C 23 Serum?

Individuals with sensitive skin or those new to vitamin C should approach this product with caution due to its high concentration of L-ascorbic acid.

How often should I use The Vitamin C 23 Serum?

Daily, preferably in the morning, gradually introducing it into the routine.

How long until The Vitamin C 23 Serum shows results?

Antioxidant benefits are immediate, but visible brightening and improvement in hyperpigmentation typically take 4 to 6 weeks of consistent use.

What can I layer The Vitamin C 23 Serum with?

Is The Vitamin C 23 Serum worth the price?

Given its high concentration of L-ascorbic acid and supporting ingredients, this serum offers a strong value proposition for those seeking a potent vitamin C treatment.

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.