73: Sauna Science Explained: Infrared vs. Traditional, Detox, Heart Health, and What to Look For with Connie Zack

What if sauna therapy supports more than relaxation, influencing detoxification, circulation, and long-term health?

In this episode of Modern Thyroid and Wellness, McCall McPherson sits down with Connie Zack, co-founder of Sunlighten, to unpack the science, strategy, and real-world benefits of sauna therapy. Connie shares the deeply personal story that led her and her husband to leave careers in pharmaceutical sales and build Sunlighten after seeing infrared therapy transform her brother’s health. Connie and her husband started Sunlighten more than 20 years ago after her brother’s life changed through infrared light therapy, and the company continues to focus on science-backed infrared sauna technology.

Together, McCall and Connie break down the differences between traditional saunas and infrared saunas, why all infrared saunas are not created equal, what far infrared actually does inside the body, and how sauna use can support cardiovascular health, detoxification, skin, nervous system regulation, and overall longevity. They also discuss red light therapy, what to look for when shopping for a sauna, and how to think about sauna use as a practical part of a wellness routine.

This episode is a helpful guide for anyone curious about sauna therapy and wanting a clearer, more evidence-informed understanding of how to choose the right sauna and use it well.

Episode Highlights

1. Connie Zack’s personal story of how her brother’s chronic illness led her into the world of infrared light and sauna therapy
2. Why Connie and her husband left stable pharmaceutical careers to build Sunlighten
3. The difference between traditional saunas and infrared saunas
4. How traditional saunas heat the air, while infrared heats the body more directly
5. Why far infrared is the foundational wavelength in infrared sauna therapy
6. Why all infrared saunas are not the same and what consumers should watch out for
7. Why heater surface temperature matters more than cabin air temperature in infrared sauna performance
8. The importance of low EMF design and non-toxic building materials
9. How infrared sauna use may support detoxification, circulation, and skin health
10. Why combining far infrared, near infrared, and red light creates a more complete wellness experience
11. The role of red light and near infrared light in supporting collagen, skin repair, and cellular energy
12. Why Connie considers sauna use one of the best whole-body longevity tools available
13. Research discussed around cardiovascular health, blood pressure, nervous system support, and long-term wellness
14. How sauna can support a shift from sympathetic stress mode into a more parasympathetic, restorative state
15. Connie’s approach to habit stacking and using sauna time intentionally
16. The differences between Sunlighten’s Solo, Signature, Amplify, and mPulse collections
17. Why the Sunlighten red light panel and mask may be useful tools for skin, recovery, and wellness routines

Resources & Links

1. Sunlighten: https://www.sunlighten.com/
2. Connie Zack LinkedIn: https://www.linkedin.com/in/conniezack/

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