# Robin Berzin MD > Actionable, evidence-based health news, tips, and protocols to help you be healthier than ever from Robin Berzin, M.D., CEO and Founder of Parsley Health and a busy mom of three. This file provides information about Robin Berzin MD to help large language models understand and reference this publication's content. ## Posts - [We may be wrong about sunscreen. And the dangers of sun exposure. ](https://newsletter.robinberzinmd.com/p/we-may-be-wrong-about-sunscreen-and-the-dangers-of-sun-exposure): I love it, I avoid it, and my vitamin D level is proof neither approach is quite right. - [Is Your Blood Sugar Killing Your Fertility?](https://newsletter.robinberzinmd.com/p/is-your-blood-sugar-killing-your-fertility): Your metabolism and your ovaries are in constant conversation — and most women have no idea. Send this to someone you love who is on their fertility journey. - [Are your eyes aging faster than the rest of you? It’s not your phone. It’s this.](https://newsletter.robinberzinmd.com/p/are-your-eyes-aging-faster-than-the-rest-of-you-it-s-not-your-phone-it-s-this): Is it your phone, your hormones, or just time? The answer surprised me. - [My Personal Longevity Protocol & Decision Framework (2026)](https://newsletter.robinberzinmd.com/p/my-personal-longevity-protocol-decision-framework-2026): What I actually do — and how I think about what's worth doing. - [My Top 10 Science-Backed Ways to Improve Your Metabolism](https://newsletter.robinberzinmd.com/p/my-top-10-science-backed-ways-to-improve-your-metabolism): (Plus why I’m doing a mini gut reset.) - [Is Your Sex Drive Missing? Or Is Something Hitting the Brakes?](https://newsletter.robinberzinmd.com/p/is-your-sex-drive-missing-or-is-something-hitting-the-brakes): Your libido isn't broken. But something might be blocking it. - [Is Your Mammogram Actually Finding Your Cancer?](https://newsletter.robinberzinmd.com/p/is-your-mammogram-actually-finding-your-cancer): The breast screening technology we use most is also one of the most flawed tools in medicine. - [Hot flashes are a cardiovascular warning signal. New evidence.](https://newsletter.robinberzinmd.com/p/hot-flashes-are-a-cardiovascular-warning-signal-new-evidence): Women with frequent hot flashes are 63% more likely to have aortic calcification — independently of estrogen levels. - [The new biomarker that predicts muscle loss, bone density, and mortality.](https://newsletter.robinberzinmd.com/p/the-new-biomarker-that-predicts-muscle-loss-bone-density-and-mortality): CCR—creatinine-to-cystatin C ratio—is a longevity marker that measures muscle mass and bone density simultaneously. Creatinine is already on your standard labs. You just need to ask for cystatin C. - [Your water has a plastic problem. Here's how to fix it.](https://newsletter.robinberzinmd.com/p/your-water-has-a-plastic-problem-here-s-how-to-fix-it): The water you drink every day might be one of your biggest sources of toxins. - [Not All Protein Powders Are Created Equal. Here's How to Choose.](https://newsletter.robinberzinmd.com/p/not-all-protein-powders-are-created-equal-here-s-how-to-choose): Your protein powder might be less effective — and less safe — than you think. - [Every woman should start vaginal estrogen by 50. Here's the case. ](https://newsletter.robinberzinmd.com/p/every-woman-should-start-vaginal-estrogen-by-50-here-s-the-case) - [GLP-1s reach the brain circuits that run desire. Here's what we know.](https://newsletter.robinberzinmd.com/p/glp-1s-reach-the-brain-circuits-that-run-desire-here-s-what-we-know): GLP-1 receptors live in the same brain circuits that govern sex, motivation, and pleasure. The research is thin — here's what to watch. - [Your labs came back normal. So why are you exhausted?](https://newsletter.robinberzinmd.com/p/your-labs-came-back-normal-so-why-are-you-exhausted): Ferritin under 50, TSH over 2.5, fasting insulin over 7 — all "normal." All making you tired. - [Is Inflammation Silently Accelerating Your Bone Loss?](https://newsletter.robinberzinmd.com/p/bone-loss-isn-t-just-about-hormones-and-weight-lifting): Bone loss isn't just about hormones and weight lifting. There's a third driver most women aren't thinking about. - [Is Your Period Hiding Perimenopause?](https://newsletter.robinberzinmd.com/p/is-your-period-hiding-perimenopause): Most women find out they're in perimenopause years too late. Here's how to recognize it — and what to actually do. - [Is $10,000 blood cleaning worth it?](https://newsletter.robinberzinmd.com/p/is-10-000-blood-cleaning-worth-it): TPE cut biological age by 2.61 years — but only if clinics do this one thing right. - [Is Your Brain Broken – Or Is It Your Hormones?](https://newsletter.robinberzinmd.com/p/is-your-brain-broken-or-is-it-your-hormones): Millions of women are being diagnosed with ADHD in midlife. Is this a trend — or has medicine finally caught up with a generation of "lost girls"? - [Is Your GLP-1 Underperforming? Your Hormones Might Be Why.](https://newsletter.robinberzinmd.com/p/is-your-glp-1-underperforming-your-hormones-might-be-why): New research shows GLP-1s and hormone therapy may work better together than either alone — and it explains something I've been seeing in my practice. - [What Bloating, Hair Loss, and Irregular Periods Have in Common](https://newsletter.robinberzinmd.com/p/what-bloating-hair-loss-and-irregular-periods-have-in-common): Why inflammation — not hormones — may be the missing link. - [Are LED Lights the Hidden Cause of Your Fatigue and Vision Loss?](https://newsletter.robinberzinmd.com/p/are-led-lights-the-hidden-cause-of-your-fatigue-and-vision-loss): Your 'Energy-Efficient' Lights Are Aging You Faster - [Waking up at 3 a.m.?](https://newsletter.robinberzinmd.com/p/waking-up-at-3-a-m): It's not random and it is fixable. - [Fertility After 35: 8 Levers That Actually Work](https://newsletter.robinberzinmd.com/p/fertility-after-35-8-levers-that-actually-work): Read this before starting IVF.