The Ordinary Retinol 0.5% in Squalane is a water-free serum that combines pure retinol with moisturizing squalane. This highly-stable formula helps reduce signs of aging while providing hydration, making it an effective yet gentle option for those seeking anti-aging benefits. This product contains 0.5% pure retinol in a squalane base, making it suitable for those who have already built some tolerance to retinol. For best results, apply in the evening after water-based treatments but before heavier creams. Sun protection is essential when using this product as retinol can increase sun sensitivity. Not recommended during pregnancy or breastfeeding. Store in a cool, dry place and use within three months of opening.