In this week’s Health newsletter: Longevity expert Dan Buettner answers subscribers’ burning questions on aging, the sport that gives your brain a surprisingly good workout, and how lucid dreaming could help manage anxiety and insomnia. 

But first: Women are turning to testosterone to feel younger. Does it work?  

As more women look for ways to manage menopause symptoms—from hot flashes to brain fog and low libido—testosterone is being touted as a modern fix for energy, mood, and focus. But does the research back that up? Here’s what scientists say about when testosterone actually does help—and when it doesn’t.

In our new Ask a Nat Geo Expert Anything series, Dan Buettner weighs in on how to apply the blue zones principles to your own life—from your diet to your community—and which longevity best practices he follows.

Today’s newsletter was edited and curated by Sidney Madden and produced by Alisher Egamov. Did someone forward this to you? Sign up here to get this newsletter and more.