Sunscreen is still the highest-ROI anti-ageing step. Choice depends on UVB (SPF) and UVA (PA) needs.
SPF vs PA
SPF mainly rates UVB burn protection; PA rates UVA which drives tanning and deeper ageing. You want both.
- Office days: SPF30 / PA++ often enough
- Outdoors: SPF50+ / PA++++
- Swim/sweat: water-resistant, reapply every 2h
Chemical vs mineral
Chemical filters absorb UV; mineral (zinc/titanium) reflect/scatter and suit sensitive skin.
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