Brand from Hong Kong: PATRA. Enriched with retinol derivatives, this serum delivers deep anti-aging benefits and improves skin texture, diminishes dullness and promotes an even skin tone. Oat extract helps soothe and repair the skin, effectively stabilizing its condition while reducing irritation and redness. This potent combination results in a healthy skin barrier and a youthful radiance.How to use:After cleansing and toning in the evening, apply evenly on face and neck, gently massage until fully absorbed. Retinol derivatives can cause irritation, redness and peeling in the early stage of the treatment. For first-time users, start using once every 3 days in the first week, then once every 2 days in the next week. Once the skin is acclimated, frequency can be increased to daily use. Apply sunscreen the following morning after use.