Story perspectives

Dermatologists: SPF 100 Blocks 99%—Use SPF 30+ Regularly

5/31/2026

Summary

Story summary

Dermatologists Adewole Adamson and Marisa Garshick explained sunscreen effectiveness in a PolitiFact article published May 30 2026.
They noted that SPF 100 blocks about 99% of UVB rays, not 100%, showing diminishing protection.
They advised using at least SPF 30 broad-spectrum sunscreen and reapplying every two hours or after swimming or sweating.
They also recommended avoiding peak UV hours and wearing wide-brimmed hats, sunglasses, and sun-protective clothing.

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Story summary

Dermatologists Adewole Adamson and Marisa Garshick explained sunscreen effectiveness in a PolitiFact article published May 30 2026.
They noted that SPF 100 blocks about 99% of UVB rays, not 100%, showing diminishing protection.
They advised using at least SPF 30 broad-spectrum sunscreen and reapplying every two hours or after swimming or sweating.
They also recommended avoiding peak UV hours and wearing wide-brimmed hats, sunglasses, and sun-protective clothing.