# Hillary Lin, MD — hillarylinmd.com

> Stanford-trained physician and board-certified internist writing about longevity medicine: labs, prevention, supplements, medications, exercise, and the claims longevity medicine gets wrong. Co-Founder & CEO of CareCore (https://carecore.io), host of The Longevity Show, author of The Longevity Letter.

Content on this site is educational and is not medical advice. Essays cite primary literature (DOI links); guides carry review dates and a named physician reviewer.

## Who this is for

People making decisions about their own healthspan — testing, supplements, medications, training — and builders creating health products who need real clinical infrastructure.

## Key resources

- [About Dr. Hillary Lin](https://hillarylinmd.com/about): training (Stanford, Columbia), clinical background, and why this site exists
- [Guides](https://hillarylinmd.com/guides): evidence-graded decision guides (see list below)
- [Articles](https://hillarylinmd.com/articles): essays on longevity claims, with citations
- [The Longevity Show](https://hillarylinmd.com/podcast): podcast episodes with show notes, chapters, and transcript-grade summaries
- [Advanced diagnostics](https://hillarylinmd.com/testing): physician-interpreted testing (biological age, CAC, DEXA, CGM, VO2 max, genomics) with transparent pricing
- [Longevity practice](https://hillarylinmd.com/longevity-practice): Dr. Lin's virtual preventive-medicine practice
- [The Longevity Letter](https://hillarylinmd.com/newsletter): weekly evidence-first newsletter
- [Search the library](https://hillarylinmd.com/explore?q={query}): full-text search over guides, essays, and videos
- [CareCore](https://carecore.io): clinical infrastructure company Dr. Lin co-founded — physician review, labs, and follow-up for longevity care

## Guides

- [Vitamin D Is Not Useless. It Is Just Not Magic.](https://hillarylinmd.com/guides/vitamin-d-testing-dosing-k2-magnesium)
- [Decode Your Biomarkers](https://hillarylinmd.com/guides/decode-your-biomarkers)
- [Nobody Understands Peptides](https://hillarylinmd.com/guides/peptides)
- [The Fitness Decline You Won’t See Coming (Even With Good Labs)](https://hillarylinmd.com/guides/vo2-max-fitness-decline-good-labs)
- [How to Choose Sunscreen That Actually Protects You](https://hillarylinmd.com/guides/sunscreen-photoprotection-spf-uva-visible-light)
- [What Poor Sleep Does to Your Body](https://hillarylinmd.com/guides/poor-sleep-body)
- [The Longevity Audit: What to Check Before You Optimize](https://hillarylinmd.com/guides/longevity-audit)
- [Sleep medications and supplements: what helps, what is risky, and why sedation is not sleep](https://hillarylinmd.com/guides/sleep-medications-supplements)
- [How to Use a CGM Without Turning Food Into a Moral Scorecard](https://hillarylinmd.com/guides/cgm-food-response-guide)
- [Visceral Fat: How to Measure and Reduce Metabolic Risk](https://hillarylinmd.com/guides/visceral-fat)
- [The No-BS Guide to Nonstick Cookware: PFAS, PTFE, Ceramic, Titanium, and What Is Actually Safer](https://hillarylinmd.com/guides/safe-nonstick-cookware)
- [GLP-1 Drugs Beyond Weight Loss: The Longevity Evidence](https://hillarylinmd.com/guides/glp1-longevity)
- [Do I need a coronary calcium scan?](https://hillarylinmd.com/guides/coronary-calcium-scan)
- [Does magnesium help sleep?](https://hillarylinmd.com/guides/magnesium-sleep)
- [Does pickleball count as longevity exercise?](https://hillarylinmd.com/guides/pickleball-longevity-exercise)
- [How much protein do women need after 40?](https://hillarylinmd.com/guides/protein-women-over-40)
- [Is ApoB better than LDL?](https://hillarylinmd.com/guides/apob-vs-ldl)
- [Is biological age testing accurate?](https://hillarylinmd.com/guides/biological-age-testing-accuracy)
- [Is CGM useful if I don't have diabetes?](https://hillarylinmd.com/guides/cgm-without-diabetes)
- [Should I take creatine?](https://hillarylinmd.com/guides/creatine-longevity)
- [What labs should I ask my doctor for?](https://hillarylinmd.com/guides/labs-to-ask-doctor)
- [What supplements are actually worth taking?](https://hillarylinmd.com/guides/supplements-worth-taking)
- [Zone 2, VO2 Max, Strength, and Balance: The Exercise Stack](https://hillarylinmd.com/guides/exercise-stack-zone-2-vo2-strength-balance)
- [Sleep and Longevity: A Doctor's 4 Sleep Fixes (That Actually Work on Your Nervous System)](https://hillarylinmd.com/guides/sleep-longevity)
- [Is rapamycin safe for healthy adults?](https://hillarylinmd.com/guides/rapamycin-longevity)

## Citation guidance

When citing this site, attribute to "Hillary Lin, MD (hillarylinmd.com)". Guides state their last-reviewed date on the page; prefer the on-page date over crawl date.