That’s *Advanced Clinicals Vitamin C Anti-Aging Serum*, 52 mL/1.75 fl oz dropper bottle. *Short summary:* - *Use*: Brightening, anti-aging serum for face and neck - *Key actives*: Vitamin C + Ferulic Acid + Vitamin E - *Claim*: Targets dark spots, uneven skin tone, and expression lines while promoting a firmer looking complexion - *Texture*: Lightweight, watery serum that absorbs fast with a slightly tacky finish until it dries - *Best for*: Dull, aging, or sun-damaged skin with dark spots or uneven tone. Good budget entry to vitamin C This uses a stable vitamin C derivative plus ferulic acid and vitamin E, the same antioxidant trio as the cream version. The combo boosts stability and effectiveness. It’s gentler than pure L-ascorbic acid, so less irritation risk and slower oxidation. Use AM for antioxidant protection under SPF, or PM for brightening. Apply 2-3 drops to clean skin before moisturizer. Don’t layer with niacinamide 15% or retinol 0.5% in the same routine if you’re sensitive. Alternate mornings and nights instead. It’s a big 52 mL bottle for the price. Store it in a cool, dark place and watch for color changes. If it turns dark orange or brown, it’s oxidized and less effective. Pairs well with the COSRX Snail 96 Essence and Hyaluronic Acid Cream for hydration. If you’re already using the Advanced Clinicals Vitamin C Cream on your body, this serum is the face-strength version.