Cosrx Vitamin C 23 Serum 20.0g

Formulated with a 23 percent concentration of pure L‑ascorbic acid, this Cosrx serum delivers targeted brightening and deep antioxidant protection in a precise 20.0g dose.

Active Composition

The high-potency ascorbic acid solution works by suppressing melanin transfer pathways while actively neutralizing environmental free radicals. Each 20.0g unit sits on a lightweight aqueous foundation that combines the concentrated vitamin with sodium hyaluronate and panthenol, maintaining cellular hydration and barrier integrity as the active compound penetrates the upper dermis.

Application Protocol

• Dispense 4 to 5 drops onto cleanse skin, focusing on areas with lingering sunspots or uneven tone.
• Pat the serum upward using fingertips rather than rubbing, allowing the full concentrate to absorb within approximately 60 seconds.
• Seal with a moisturizer and immediately apply broad-spectrum SPF 30+ during morning cycles to protect the newly exposed skin layers from UV degradation.

Tolerance & Storage

A 23 percent ascorbic acid load significantly accelerates natural exfoliation, so start with every-third-day application to gauge sensitivity before moving to twice-daily use. Store the container tightly capped in a cool location out of direct sunlight; discard the batch if the solution turns deeply orange or amber, indicating the active molecules have fully oxidized.