Nutrition Facts with Dr. Greger

Screening the Sunscreens

75 snips
Sep 11, 2025
Is sunscreen really a shield against aging and cancer? Discover the truth about daily application and its crucial role in skin health, especially for lighter skin tones. Dive into the safety of various sunscreen formulations, with a focus on mineral options. Uncover the balance between UV exposure and vitamin D, while considering demographic usage trends. Learn how diet can complement sunscreen use for anti-aging benefits and the surprising environmental effects of certain products.
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ADVICE

Prefer Creams Over Sprays And Avoid Aerosols

  • Use cream-based sunscreens and rub in any spray-on product immediately to ensure full coverage.
  • Avoid aerosol sunscreens due to flammability and uncertain inhalation safety.
INSIGHT

Sunscreen Alone Doesn’t Block All Harmful Wavelengths

  • Sunscreens mainly block ultraviolet light, but visible and infrared spectra also produce about half the sun-induced free radicals.
  • Therefore, sun avoidance and protective clothing remain important complements to sunscreen.
ADVICE

Choose Mineral Sunscreens (Zinc Or Titanium)

  • Prefer mineral sunscreens containing zinc oxide or titanium dioxide, as the FDA currently deems them safe.
  • Avoid chemical sunscreen actives until safety testing clarifies systemic absorption risks.
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