# The Longevity Letter > Hype-free longevity and healthspan protocols from a Stanford-trained MD. This file provides information about The Longevity Letter to help large language models understand and reference this publication's content. ## Posts - [Two supplements I like. One I don't.](https://newsletter.hillarylinmd.com/p/vitamin-d-creatine-nad-supplements-deleted): Vitamin D made me rethink both dose and K2. Creatine disrupts my sleep. NR still has better biomarker data than outcome data. - [Why I broke up with fibermaxxing](https://newsletter.hillarylinmd.com/p/i-broke-up-with-fibermaxxing): What fiber really does, what the longevity data cannot prove, and why more made me feel worse. - [I Raised My Omega-3 Level. Then I Read the Trials.](https://newsletter.hillarylinmd.com/p/i-raised-my-omega-3-level-then-read-the-trials): The supplement worked on my blood test. That did not answer the question I actually cared about. - [The Recall Is Over. What If the Illness Isn't?](https://newsletter.hillarylinmd.com/p/why-healthy-food-keeps-making-us-sick): Why this parasite survives the wash, when treatment is worth it, and what an infection can leave behind. - [Five Meal-Timing Myths That Are Costing You Muscle](https://newsletter.hillarylinmd.com/p/meal-timing-myths-body-recomposition): The most-hyped advice in fitness is wrong. This is your de-influencing guide to what actually changes your fat and muscle for the better. - [Inflammation Is Not One Thing. So Which Test Do You Need?](https://newsletter.hillarylinmd.com/p/how-to-measure-inflammation): Acute versus chronic, local versus systemic, and what CRP, ESR, ferritin, and hsCRP can actually tell you. - [Peptides won an FDA committee vote. I think that was the right call.](https://newsletter.hillarylinmd.com/p/peptide-vote-regulated-access): Six peptide families got a favorable recommendation. Here is what people are buying them for, what happens next, and why pharmacies still cannot fill a prescription. - [A Pill That Lowers LDL Nearly 60%: Would I Switch?](https://newsletter.hillarylinmd.com/p/first-oral-pcsk9-lipfendra-enlicitide): Lipfendra is the first oral PCSK9 inhibitor. I take Repatha. Here is how the pill compares with injections, statins, RNA drugs, and experimental gene editing. - [What Changed My Mind About Vitamin D](https://newsletter.hillarylinmd.com/p/vitamin-d-first-principles): The exact test I order, how I read the ranges, and when D3, K2, or magnesium makes sense. - [There is no such thing as sunblock](https://newsletter.hillarylinmd.com/p/no-such-thing-as-sunblock): SPF tells you how long it takes to burn. It does not tell you how well you're protected from aging, pigment, or the light your sunscreen ignores. - [The Peptide Gray Zone](https://newsletter.hillarylinmd.com/p/peptide-gray-zone): What FDA’s July meeting means, what the evidence actually says, and why sourcing may matter as much as the molecule. - [Is the next longevity "wearable" a full-body scan?](https://newsletter.hillarylinmd.com/p/body-scan-wearable-midjourney-medical): Midjourney Medical, whole-body MRI, DEXA, BIA, CT, and the practical way to think about repeated scans. - [How to lose the right kind of weight](https://newsletter.hillarylinmd.com/p/how-to-lose-the-right-kind-of-weight): Visceral fat, muscle, and what the scale hides. - [The Longevity Spring Clean](https://newsletter.hillarylinmd.com/p/the-longevity-spring-clean): Whether you're getting started or continuing your longevity journey, this physician framework helps prioritize risk, actionability, and evidence for your own unique biology. - [Do not fear the broccoli](https://newsletter.hillarylinmd.com/p/do-not-fear-the-broccoli): Water first. Hot plastic second. Detox last. - [Your blood pressure is not boring. Your annual physical just makes it look that way.](https://newsletter.hillarylinmd.com/p/after-hrv-bpv-blood-pressure-variability): Mean BP is the load. BPV is the volatility. Vascular tone is where the plot gets fun. - [The most important aging clock is not your biological age](https://newsletter.hillarylinmd.com/p/the-most-important-aging-clock-is-not-your-biological-age): Let's talk organ-specific aging clocks. The organ that ages first may pull the others with it. - [Why Pickleball Is the Ultimate Longevity Sport](https://newsletter.hillarylinmd.com/p/pickleball-ultimate-longevity-sport): If you love it, play it better. If you hate it, steal the physiology: power, balance, reaction time, cardio, and play. - [The one supplement I might throw away first](https://newsletter.hillarylinmd.com/p/the-one-supplement-i-might-throw-away-first): A new aging mechanism puts iron on trial, and it matters even if you never bought an iron pill. - [Your sleep score is lying to you](https://newsletter.hillarylinmd.com/p/subject-specific-counterintuitive-single-thesis-examples-your-supplement-might-contain-viagra-lead-o-77a7): It's not how long you sleep that matters most. The three sleep metrics that actually predict Alzheimer's risk — and what your wearable is quietly hiding from you. - [Gray market peptides: A harm reduction guide](https://newsletter.hillarylinmd.com/p/gray-market-peptides-a-harm-reduction-guide) - [The NIH tested 8 longevity supplements this year. All 8 failed.](https://newsletter.hillarylinmd.com/p/subject-specific-counterintuitive-single-thesis-examples-your-supplement-might-contain-viagra-lead-o): The supplement Bryan Johnson takes - and sells - didn’t survive the NIH’s longevity trial. - [Peptides get the hype. These amino acids get the results. ](https://newsletter.hillarylinmd.com/p/peptides-get-the-hype-these-amino-acids-get-the-results): The leucine paradox, the $20 GlyNAC stack, and why your protein shake math changes at 50. - [Your Supplement Might Contain Viagra, Lead, or Poison](https://newsletter.hillarylinmd.com/p/your-supplement-might-contain-viagra-lead-or-poison): The FDA Legally Cannot Stop It - [The longevity drug we've had all along? Plus Rapamycin, Dog Longevity, and More](https://newsletter.hillarylinmd.com/p/longevity-drug-rapamycin)