Why do we keep recommending vitamin-A-derived retinoids for beautiful skin? Because they've been clinically proven to reduce fine lines and help generate collagen and elastin. The formulators of the new PCA Skin Intensive Age Refining Treatment ($106; pcaskin.com
for locations) claim that the pure retinol it contains is significantly more potent than the retinol complexes found in other products. Plus, the lotion contains anti-inflammatory and anti-irritant extracts to calm the skin. If you're a retinoid newbie, this serious lotion is a good way to start.