10% Happier with Dan Harris · 2026-05-11 · 68 min · 10,449 words

The Science of Supplements: What Works, What's Hype, and What Could Actually Harm You | Dr. Mahtab Jafari

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This is the 10% Happier Podcast. I'm Dan Harris. Hello, everybody. Today we're talking about one of the most confusing and controversial areas of wellness and fitness, and that is supplements. Should you be taking them?

Which ones should you be taking? How do you know? How do you separate fact from fiction in the midst of this multi-billion dollar, almost entirely unregulated business where people are making all sorts of wild health claims? So what to do about all this? We brought in a ringer, an expert, Dr.

Matab Jafari. She's a professor at the University of California, Irvine, and she's also written a book called The Truth About Dietary Supplements, an evidence-based guide to a safer medicine cabinet. Real quick, as many of you know, one of the major use cases for supplements is, of course, sleep, which is why we are this week over on the 10% app adding a ton of new sleep content. We've just added 10 new sleep meditations. We're also going to be doing a live session tomorrow where our teacher of the month, Kara Lai, is going to talk about how to use meditation for sleep.

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