Jennifer Cohen and Robbie Besner come at health from two different angles — she from fitness, habits, and performance coaching, he from health technology and the science side of wellness — which makes their joint appearance with Sean Kelly on the Digital Social Hour an unusually well-rounded conversation. Episode 1852 opens with a question most supplement enthusiasts never stop to ask: can you actually take too much of a good thing?
From vitamin D toxicity and supplement overload, the discussion widens into nicotine's surprising place in biohacking circles, why sunlight and skin tone factor into vitamin D levels, and a shared conviction that confidence is earned through discipline rather than repeated affirmations.
About Jennifer Cohen & Robbie Besner
Jennifer Cohen is a fitness entrepreneur, author, and host of the Habits and Hustle podcast, where she has spent years interviewing high performers about the routines behind their results. Her work sits at the intersection of fitness, psychology, and habit-building, with a consistent through line: confidence comes from doing hard things, not talking about them.
Robbie Besner is a health-technology entrepreneur known for his work in infrared and wellness devices, and a longtime voice in the biohacking community. Together, Cohen and Besner bring a practitioner's eye and a builder's skepticism to an industry full of bold claims — which is exactly the energy this episode runs on.
What Jennifer Cohen & Robbie Besner and Sean Kelly Talked About
- Why the guests believe taking too many supplements can backfire on your health
- How vitamin D works in the body — and the case that it can become toxic in excess
- Why sunlight exposure and skin tone factor into the vitamin D conversation
- What's behind nicotine's surprising rise as a trend in biohacking circles
- How the guests think about mitochondria and their role in everyday energy
- Why fitness builds confidence in a way affirmations never will
- How podcasts can stand out and innovate in an increasingly crowded market
- The psychology of likability and the habits behind long-term success
Why This Conversation Matters
The supplement aisle keeps growing, and so does the confusion around it. This episode is valuable precisely because it questions the more-is-better instinct, with Jennifer Cohen and Robbie Besner pressure-testing popular health trends instead of selling them. As with any health conversation, these are the guests' views — but they are views worth hearing before your next supplement order.
▶ Watch the full episode on YouTube
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About Sean Kelly & the Digital Social Hour
Sean Kelly is an entrepreneur and the host of the Digital Social Hour, one of the fastest-growing interview podcasts in the world, where he sits down with entrepreneurs, athletes, creators, and cultural voices for candid, long-form conversations. The show draws over 100 million views a month across platforms. Explore more guest features on SeanKelly.io.
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