COSRX - The Vitamin C 13 Serum

This serum is ideal for adults concerned with dullness, uneven skin tone, dark spots, fine lines, and signs of aging. It is particularly effective for those seeking a brighter, more radiant complexion.

You can use it once or twice daily. If you have sensitive skin or are new to Vitamin C, start with once a day, preferably in the evening, and gradually increase to twice daily as tolerated.

Yes, it can be incorporated into your routine with most COSRX products. However, avoid using it simultaneously with other strong actives like AHA/BHA toners or other high-concentration Vitamin C products to prevent potential irritation.

Super Vitamin E enhances the antioxidant power of Vitamin C and conditions the skin. Hyaluronic Acid provides deep hydration, helping to plump the skin and maintain moisture balance.

Vitamin C can make your skin more sensitive to the sun. Using sunscreen daily is crucial to protect your skin from UV damage and to maximize the brightening and anti-aging benefits of the serum.

Results vary by individual, but many users notice improvements in skin brightness and texture within 2-4 weeks of consistent use. Fading of dark spots may take longer, typically 4-8 weeks.

While Vitamin C can help with post-acne marks, individuals with active, inflamed acne should proceed with caution. Patch testing is recommended. It's generally well-tolerated due to its conditioning ingredients.

This indicates oxidation, meaning the Vitamin C has degraded. Store the product in a cool, dark place and ensure the cap is tightly sealed. If the color change is significant, it's best to discontinue use as efficacy may be reduced.

This is common with high-concentration Vitamin C. Start by using the product once a day, preferably at night. If irritation persists, reduce frequency or discontinue use. Ensure you are using a good moisturizer and SPF.

Allow a few extra minutes for the serum to absorb fully before applying subsequent products. Applying too much product can also lead to a sticky feeling; try using fewer drops.