Part 12/14:
- Broad-spectrum formulations that protect against UVA (which causes aging and DNA damage) and UVB are essential.
Applying and Reapplying
A key tip is diligent reapplication every 2-3 hours, especially during sweating or swimming, as sunscreen can wash off. Many mistakenly believe a single application suffices, but regular reapplications are critical for maintaining protection.
The UVA and UVB Balance
While SPF primarily measures UVB protection, UVA rays also harm the skin, promoting aging and DNA damage. Therefore, choosing a broad-spectrum sunscreen with high UVA coverage (indicated by + or ++ on labels) ensures comprehensive shield against sun-related skin harm.