Biotherm's Blue Therapy Blue Retinol Night Serum is a powerful anti-aging treatment specifically designed for nighttime use. Infused with Blue Retinol, a unique form of retinol combined with Blue Algae extract, this serum targets wrinkles, fine lines, and uneven skin tone. It works overnight to stimulate skin renewal, smooth texture, and enhance radiance. The lightweight and fast-absorbing formula also includes Biotherm's Algae of Youth complex to nourish and rejuvenate the skin. Ideal for all skin types, it helps to restore a youthful appearance and improves skin resilience with continued use.