That’s *COSRX The Retinol 0.5 [/oil/]*, 20 mL/0.67 fl oz dropper bottle. *Short summary:* - *Use*: Oil-based retinol treatment for face - *Key actives*: 0.5% Pure Retinol + Super Vitamin E (Tocotrienol) + Squalane - *Claim*: Improves firmness, smooths texture, boosts radiance, and targets early signs of aging - *Texture*: Lightweight, dry oil that absorbs without heavy greasiness - *Best for*: Normal to dry skin, or anyone new to mid-strength retinol. Good if you want anti-aging without the typical dryness 0.5% is considered intermediate strength. Stronger than The Ordinary’s 0.2% but gentler than 1%. COSRX buffers it in squalane, a skin-identical oil that reduces irritation and helps retinol penetrate. Super Vitamin E is an antioxidant that fights free radicals and stabilizes the formula. *Important*: PM use only. Start 1-2x per week on dry skin after moisturizer (sandwich method) if you’re new, then work up to using before moisturizer. Don’t mix with AHAs, BHA, benzoyl peroxide, or vitamin C in the same routine. Avoid if pregnant/breastfeeding. SPF is non-negotiable the next day. If you already use the AHA/BHA peel or Paula’s Choice BHA, alternate nights. Don’t stack them. This plays great with the Snail 96 Essence and Hyaluronic Acid Intensive Cream for buffering.