Why Sunscreen Quality Matters More Than Ever
Most people think SPF is the only number that matters.
But 2025 research shows the type of UV filter, the stability of the formula, and the presence of endocrine-disrupting chemicals matters far more for long-term health.
A sunscreen’s real job is to:
Protect skin from UVA (aging) and UVB (burning)
Avoid hormone-disrupting ingredients
Stay stable under heat
Avoid nanoparticles that enter the bloodstream
Prevent inflammation, dermatitis, and photoreactive rashes
SPF tells you almost nothing about safety.
That’s why the Safe Sunscreen Index exists.
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