Broad-spectrum sunscreen, at SPF 30 to 50 or higher, is the single most evidence-based anti-ageing and skin-protective step available, protecting against UV damage that drives both skin ageing and skin cancer risk. Daily use, not just on sunny holidays, is the point.
The evidence that regular broad-spectrum sunscreen use reduces skin ageing and lowers skin cancer risk is strong and well established. Among everything in a skincare or longevity routine, daily sun protection has arguably the best evidence-to-effort ratio of any single habit.
Very low risk. Some people find certain formulations irritating or prefer mineral over chemical filters. The main failure is under-application and inconsistent use rather than any inherent danger.
Rarely needed. See a doctor promptly for any changing, new or unusual mole or skin lesion, sunscreen reduces risk but does not replace checking your skin.
Inexpensive to moderate, an everyday product. Cost per use is very low relative to benefit.
Dermatology and public health evidence on sunscreen, photoageing and skin cancer prevention. NHS sun safety guidance. Educational information only.