What Are Peptides?

About this video

Yurth introduces peptides as short chains of amino acids that act as precise signaling molecules, using insulin as the familiar example and contrasting peptides’ specific actions with hormones’ broader effects. She explains why, in her telling, most are given by injection rather than orally — digestive breakdown — and warns against mixing multiple peptides together or using unverified research-chemical sources she claims may be contaminated. Her favorites, she says, are largely endogenous and decline with age: thymic peptides for immune regulation and repair, a gut-derived repair peptide, growth-hormone secretagogues, mitochondrial peptides, and a topical copper peptide for collagen and gene-expression effects.

Key takeaways

• Think of peptides as short, specific signals rather than generic supplements
• Delivery route matters because Yurth says oral breakdown limits many peptides
• Avoid mixing peptides, which she argues can change what is actually delivered
• Source quality is presented as a safety issue, not just a potency issue
• Yurth prioritizes peptides the body normally makes and loses with age

Episode details: published April 5, 2025 · 1.4K views · 6:45 long. Summary written by Self Growth Videos from the episode itself. The longevity and peptide concepts described are Dr. Elizabeth Yurth’s, presented for education — not medical advice. Consult a qualified professional before changing your own health practices. Disclosure: Dr. Yurth is co-founder and Chief Medical Officer of the Boulder Longevity Institute, a clinic, and BLI Academy sells clinician education.

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