[Bonus Episode] Could Your Sunscreen Be More Dangerous Than the Sun? | Guerry Grune

Is Your Sunscreen Actually Toxic? Non-Nano Zinc, UVA/UVB & Endocrine Disruptors Explained

Most of us were told, “Just wear SPF 30 and you’re safe.” But what if the lotion you’re rubbing into your skin is loaded with endocrine-disrupting chemicals, potential benzene contamination, and ingredients that quietly shut down your body’s own sun-defense system?

In this episode of Performance Driven Living, Mark Young sits down with chemical engineer and Third Rock founder Dr. Guerry Grune to dismantle everything you think you know about sunscreen, SPF, tanning, and skin health.

If you’re a health-conscious parent, athlete, biohacker, or Floridian who lives outside, this conversation will completely change how you look at that bottle of sunscreen in your beach bag.

In this episode, you’ll learn:

• The real difference between chemical sunscreens (like oxybenzone, avobenzone & friends) and mineral sunscreens (zinc oxide) — and why some widely used chemical filters are under fire for potential hormone-disrupting and environmental effects.
• The truth about tanning beds vs natural sunlight, what melanin actually does, and why controlled UV exposure can be a smart tool when you understand UVA vs UVB.
• Why your skin is a mirror of internal health, how endocrine disruptors can interfere with detox pathways, and why “garbage in, garbage out” applies to both your diet and your skincare.
• What the recent benzene contamination recalls in aerosol sunscreens revealed about the industry, quality control, and why “what’s on the label” is only half the story.

Why this matters now

“Clean” beauty, endocrine disruptors, and benzene in consumer products are all trending because people are finally asking harder questions about what goes on their skin.

This episode goes way beyond fear-mongering headlines. You’ll hear from a PhD chemical engineer who’s spent decades in materials science, patent work, and photobiology, breaking down:

• How FDA sunscreen rules actually work
• Why the market pushed nano-sized filters and “invisible” lotions
• And what a truly non-toxic, performance-driven sunscreen has to do differently

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