COSRX Pure Vitamin C 13% Serum — 0.67 oz Renewal Brightening Serum with Hyaluronic Acid & Vitamin E

This concentrated 0.67 oz (20 mL) renewal serum is formulated for everyday use: a stabilized 13% vitamin C (ascorbic acid) base supported by tocotrienol (Super Vitamin E), low‑molecular hyaluronic acid and glutathione. The result is a fast‑absorbing liquid designed to deliver antioxidant support, visible radiance and smoother texture without a sticky finish. The bottle is compact for travel and refrigeration is recommended after opening to slow oxidation.

How does this serum fit into my morning and evening routine?

Apply 2–3 drops after cleansing and toning, before thicker creams and sunscreen. In the morning, always layer SPF 30+ on top; in the evening, follow with moisturizer to lock in hydration. Start with once daily and increase to twice if your skin tolerates it well.

• Shake 1–2 times before dispensing to ensure even delivery.
• Use 2–3 drops; pat gently into face and neck, avoiding direct eye contact.
• If used in daytime, apply broad‑spectrum SPF 30+ as the final step.
• Store in the refrigerator after opening to slow oxidation.

What skin concerns can it help with and how quickly will I notice changes?

The formula targets dullness, uneven tone and dehydration by combining vitamin C's brightening potential with hyaluronic acid's moisture and antioxidant support from Vitamin E and glutathione. Visible improvements in radiance and skin texture can appear within weeks, though results vary by individual and consistent use is key.

• 13% pure ascorbic acid for antioxidant brightening.
• Hyaluronic acid for immediate and lasting hydration.
• Tocotrienol (Super Vitamin E) and glutathione help support antioxidant performance.
• Light, fast‑absorbing texture suitable under makeup.

Is this product suitable for sensitive or acne‑prone skin?

While many users with normal to combination skin tolerate the serum well, pure vitamin C can cause irritation for highly sensitive skin or those new to active acids. Always perform a patch test and introduce slowly; discontinue use if persistent redness or irritation develops and consult a dermatologist if needed.

• Patch test on the body for 24 hours before full facial use.
• Begin with once‑daily application and monitor skin response.
• Avoid direct contact with eyes and apply sparingly around delicate areas.
• Stop use and seek advice if irritation or allergic reaction occurs.

How should I store and handle the serum to keep it effective?

Ascorbic acid is sensitive to light, heat and air, so proper storage preserves potency. Keep the bottle capped, store in a cool place, and refrigerate after opening to reduce oxidation and extend shelf life. If the formula darkens significantly or smells off, discard it.

• Shake before use to mix contents evenly.
• Close the cap tightly after each use to limit air exposure.
• Refrigerate after opening and keep out of direct sunlight.
• Discard if color or scent changes markedly.

Who is this for: COSRX Pure Vitamin C 13% Serum suits someone seeking a compact, effective antioxidant boost for dull or uneven skin tone who is comfortable introducing active ingredients into their routine. It fits users looking for a fast‑absorbing, non‑sticky serum that layers well under sunscreen and moisturizer, and who will follow recommended patch testing and storage guidance.