Archive | The Longevity Letter

Peptides get the hype. These amino acids get the results.

Peptides get the hype. These amino acids get the results.

Hillary Lin, MD

Apr 8, 2026

Your Supplement Might Contain Viagra, Lead, or Poison

Your Supplement Might Contain Viagra, Lead, or Poison

Hillary Lin, MD

Mar 31, 2026

Your Biological Age Test Might Be Lying to You

Your Biological Age Test Might Be Lying to You

Hillary Lin, MD

Mar 23, 2026

Your Brain Is Still Growing New Neurons.

Your Brain Is Still Growing New Neurons.

Hillary Lin, MD

Mar 4, 2026

GRAIL's Cancer Test Just Failed Its Big Trial. Here's Why I Still Use It.

GRAIL's Cancer Test Just Failed Its Big Trial. Here's Why I Still Use It.

Hillary Lin, MD

Feb 25, 2026

He didn't run until 66. At 82, he beats 20-yo athletes.

He didn't run until 66. At 82, he beats 20-yo athletes.

Hillary Lin, MD

Feb 17, 2026

Why I prescribe Rapamycin - but not to most of my patients

Why I prescribe Rapamycin - but not to most of my patients

Hillary Lin, MD

Feb 12, 2026

Is 50% of your lifespan already "decided"?

Is 50% of your lifespan already "decided"?

Hillary Lin, MD

Feb 3, 2026

My Unusual Body Recomp Stack

My Unusual Body Recomp Stack

Hillary Lin, MD

Jan 28, 2026

The longevity drug we've had all along? Plus Rapamycin, Dog Longevity, and More

The longevity drug we've had all along? Plus Rapamycin, Dog Longevity, and More

Hillary Lin, MD

Jan 22, 2026

Gray market peptides: A harm reduction guide

Gray market peptides: A harm reduction guide

Hillary Lin, MD

Jan 6, 2026

Stem Cells, Skin Longevity, and Why I'm Equally Excited and Skeptical

Stem Cells, Skin Longevity, and Why I'm Equally Excited and Skeptical

Hillary Lin, MD

Nov 18, 2025