To preserve your skin and look your best at any age, experts agree that retinol is one of the essential skin care products you should be using. Decades of scientific research support the use of retinol to reduce fine lines, wrinkles, and dark spots on your skin. This over-the-counter retinol from SkinMedica comes in 3 strengths, so you can start with a gentle routine and work your way up to a stronger formula as your skin adapts. Recommended by The Wirecutter, it’s now 20% off its usual price.