Retinol is widely considered to be the gold standard of "anti-aging" skincare ingredients. It works by accelerating cell turnover to create new skin. Consistent retinol use will help to: 

• Minimize the appearance of fine lines and wrinkles
• Stimulate collagen
• Create a smooth, youthful appearance
• Combat acne

Retinol is notoriously tricky because it can cause irritation if not used correctly, but it's entirely worth it to incorporate one into your regimen. Remember to go slow and start by using your retinol a couple of nights a week. Slowly work your way up to using it more consistently.