According to Dr. Engelman—and most dermatologists—SPF is the single most important anti-aging product you can use. She noted that applying SPF consistently slows down aging, preserves collagen, and keeps your skin healthy long-term. “Sun exposure is a primary factor in premature aging. No serum, cream, or treatment can undo consistent UV damage, but daily broad-spectrum SPF protects your skin at the source,” she explained. “It’s the foundation for every other anti-aging strategy.”, Amazon’s beauty hub has tons of dermatologist-backed anti-aging skincare products under $50, including hydrating serums, tinted sunscreens, and nourishing moisturizers from popular brands like La Roche Posay, RoC, CeraVe, and Paula’s Choice. Shop derm-approved picks from $12., After testing over 30 anti-aging skincare products with real-life users and consulting experts, we narrowed it down to the 17 that truly work. See which ones made the cut..