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Weekly · Sunday Morning

Five longevity claims.
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Rapamycin extends mouse lifespan 9–14%
NAD+ precursors reverse aging in humans
Blue-light glasses improve sleep quality
Walking 10 min after meals blunts glucose
Verdict change — caffeine half-life downgraded

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Stem Cells & Growth Hormone: Science or Snake Oil? | Brian Kennedy, Ph.D. — Whalespan

Content›Video›Stem Cells & Growth Hormone:…

Stem Cells & Growth Hormone: Science or Snake Oil? | Brian Kennedy, Ph.D.

Peter Attia2m · 2025-07-22

Claims Made

6

Claims Supported

2

Support Rate

33%

Support rate

2 of 6 claims supported

2 supported4 partial / not

Claims from this content

5

✓Well SupportedGene therapy and follistatin are promising for longevity but are not yet well-proven.◐Partially SupportedAddressing the safety concern of growth hormone requires long-term tracking of individuals susceptible to cancer.◐Partially SupportedGrowth hormone, when used judiciously and correctly, might be safe and can make people feel better.◐Partially SupportedStem cells may be effective for aging when used for direct soft tissue repair by a skilled practitioner.✕Not Supported

More from Peter Attia

Peter Attia on Zone 2 Cardio

Peter Attia on Rapamycin (with Matt Kaeberlein)

Attia walks back the clinic protocol: too aggressive for healthy adults

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A. Volkovreader

4h

Bookmarking — the dossier-vs-overview split is the right call. Most of the time I want overview; sometimes I want receipts.

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N. Park

2d

Would love a "what would change this verdict" RSS feed. Sign me up if it exists.

Brian Kennedy has personally chosen not to use growth hormone due to safety concerns.