Podcast Summary: The Neuro Experience
Host: Louisa Nicola & Pursuit Network
Guest: Dr. Kyle Gillette
Episode: What Are PEPTIDES & How To Use Peptides For Greater Health: Infertility, Build Muscle, & Fat Loss
Date: February 20, 2024

Episode Overview

This episode delves deep into the science and clinical use of peptides, focusing on their application in health optimization, including fertility, muscle building, fat loss, and anti-aging. Host Louisa Nicola has a candid, inquisitive discussion with Dr. Kyle Gillette, who brings expertise from endocrinology and comprehensive health optimization. The episode unpacks myths, benefits, and risks of peptide therapy, and provides grounded, practical advice for listeners interested in exploring peptides for health and performance.

Key Discussion Points & Insights

1. Modern Perspectives on Infertility & Hormones

• Unexplained Infertility?

  • Dr. Gillette explains the term is mostly outdated. With "unlimited technology you can find a cause for all cases of infertility" ([01:20]), but many cases are a mix of male and female factors ("third factor infertility").
  • Therapeutic interventions are often both diagnostic and treatment.

• Role of Stress & Hormones in Fertility

  • Changes in lifestyle and hormone balance—especially cortisol—can impact fertility.
  • Not all women struggling to conceive are permanently infertile; changes in health or stopping certain medications can reactivate fertility pathways ([03:00]).
  • Example: Drugs like Orlissa or Lupron "turn off the switch" at the pituitary, sometimes taking years to reverse ([03:00-04:24]).

• Athletic Women & Amenorrhea

  • Over-exercising and low body fat (under 20%, based on DEXA scan) can impair hypothalamic signaling and menstrual regularity ([05:00-05:18]).
  • Diet types (high EPA, megadosing omega-3, low fructose) may influence signaling and menstrual patterns ([05:18-07:38]).

• PCOS and Metabolic Health

  • High body fat often relates to insulin resistance and PCOS, which is more common than hypothalamic amenorrhea in the U.S. ([07:47-08:20]).

2. Peptides: Hype, Science, & Applications

• Why Are Peptides Trending?

  • "Peptides are becoming a boutique accessory" due to clinics/boutiques marketing them for anti-aging and performance, with growing public interest and profit motives ([08:41-09:02]).
  • Dr. Gillette likens peptides to other supplements or medications: "They're usually medications; sometimes peptides or supplements" ([08:41]).

• What Are Peptides? (Defining & Examples)

  • Short strings of amino acids (from dipeptides to a few dozen amino acids). Dr. Gillette highlights creatine, carnitine, and glutathione as simple, familiar examples ([09:02-10:13],[14:05]).
  • "I see peptides like creatine or carnitine...they can be prescribed and they can be over the counter. And all other peptides I consider medications" ([14:05-16:40]).

• L-Carnitine Insights

  • Dr. Gillette discusses the rationale for using various forms for absorption and its uses in fertility and ovarian health ([09:13-10:53]).
  • L-carnitine and choline increase TMAO, a potential carcinogen, but only in people with certain gut flora; probiotics or garlic (allicin) may reduce TMAO ([10:53-13:18]).
  • "I have seen people on really high doses...not on probiotics, just with healthy gut microbiomes and with undetectable TMAO levels. So it's definitely possible..." ([11:28]).

• Biohacking & Lab Testing Advice

  • Frequent blood testing is essential. “I'm such a big proponent of blood testing every, like, six months,” says Louisa ([13:30]).

3. Major Classes and Use Cases for Peptides

• Peptide Family Tree & Key Categories ([17:36-19:01])

  • Growth Agonists: Similar to human growth hormone (HGH), risk/benefits parallel to HGH therapy.
  • Growth Promoters: BPC157 ("upregulates angiogenesis"), GHK copper peptide (skin, liver health), TB500 (from thymus), thymic peptides (immunomodulation, not yet widely applicable).
  • Melanocortin Receptor Agonists: Some FDA-approved, e.g., setmelanotide (Imcivree), bremelanotide (Vyleesi), primarily for rare genetic disorders or libido.

• VEGF & Brain Health

  • VEGF (vascular endothelial growth factor) is a cytokine, not a strict peptide, but is promoted by exercise and certain peptides (BPC157) and helps vascularization and possible neuron health ([19:14-20:43]).

• Skin & Longevity Peptides ([21:23-23:39])

  • GHK copper peptide in OTC and prescription creams supports collagen/elastin production and skin regeneration.
  • Hexapeptides also found in over-the-counter products.
  • PRP and fat injections cited as emerging natural alternatives to synthetic fillers.

• SARMs (Selective Androgen Receptor Modifiers)

  • Not peptides but small molecules with “non-viralizing” muscle and androgenic effects for specific medical applications ([23:57-27:31]).
  • "The most promising SARM...is Enobosarm (MK2866/ostarine)" ([25:36]).
  • SARMs are 5-10 years from mainstream off-label use.

4. DHEA, “Fountain of Youth,” and Clinical Nuances

• DHEA as a Backup Hormone

  • "DHEA is what I call the pawn on the chess board of hormones. And it is a great backup hormone...After menopause, it's the sole source of estradiol" ([28:17-29:41]).
  • DHEA supplementation impacts SHBG (sex hormone binding globulin) and can aid post-menopausal women and female athletes, especially those on contraceptives.

• DHEA & Sleep

  • Louisa notes her "REM sleep has gone through the roof" with DHEA ([33:11]), affirmed by Dr. Gillette: “DHEA can be particularly dopaminergic. For a lot of females… It's also a sigma 1 receptor agonist. So it helps with parasympathetic tone…” ([33:31]).

5. Melanocortins, Risks, and Future of Peptide Medicine

• Melanocortin Receptor Agonists

  • Used for hypoactive sexual disorder, genetic obesity syndromes; can cause hyperpigmentation ("darken freckles"), nausea, and other side effects ([34:46-37:31]).
  • FDA-approved for women (Vyleesi); new agents in development aim for improved safety and efficacy.

• Safety, Regulation, & Clinical Decision-Making

  • Peptides should be viewed as serious medications, requiring sound physician oversight ([37:43-39:51]).
  • Dr. Gillette advises, “...have them explain all the benefits and all the risks. That's a scale. So think about it, balancing the scale. And you want the benefits of that medication to outweigh the risks” ([37:43-39:28]).
  • If physicians are unfamiliar, “get a new physician” or one open to learning ([38:24]).

• Risks & Monitoring

  • Some peptides pose less risk than testosterone or HRT, particularly when used short-term for targeted issues.
  • Tumor growth and hyperglycemia are potential significant risks for growth-promoting peptides ([39:51-42:25]).
  • Importance of proper screening (cancer, blood markers) prior to initiating peptide therapy.

Notable Quotes & Memorable Moments

• On the peptide hype in NYC:

  • “...for some reason I don't know whether it's just New York City, they seem the rage right now...” — Louisa Nicola ([00:30])

• On diagnostic versus therapeutic intervention in infertility:

  • “A lot of times...they do things that are both diagnostic and therapeutic. For example, try a therapy where they presume a cause...and if there is fertility, then it tells you, yes, this is the cause.” — Dr. Gillette ([01:20])

• On chasing the latest peptide trends:

  • “People are usually most excited about peptides that are just on that cusp of FDA approval...first follow the money then you'll probably find out why that, why that is.” — Dr. Gillette ([16:10])

• On balancing peptide use with safety:

  • “There's always an upside and a downside to every intervention… there's no such thing as a free lunch.” — Dr. Gillette ([28:17 & 42:46])

• On the future of SARMs:

  • “We're probably five to ten years away from off label usage of these. But I do think that Anobos ARM will get its FDA approval within two to five years.” — Dr. Gillette ([27:31])

Key Timestamps for Major Segments

• Infertility, Hormones, and Pathways: 01:20 – 08:20
• Peptides: Definitions & Supplement Confusion: 08:41 – 14:01
• L-Carnitine, TMAO, Gut Health: 10:13 – 13:18
• Peptide Classes & Regulatory Overview: 17:36 – 19:01
• VEGF & Brain/Vascular Health: 19:01 – 20:43
• Skin/Aesthetic Peptides: 21:23 – 23:39
• SARM Science & Safety: 23:57 – 27:31
• DHEA, Sleep, Menopause: 28:17 – 34:46
• Melanocortin Receptors & Libido/Obesity Treatments: 34:46 – 37:31
• How to Navigate Peptide Therapy: 37:43 – 42:46
• Closing / Finding Dr. Gillette & Lab Resources: 43:41 – 46:11

Resources & Further Learning

• Dr. Kyle Gillette Instagram: [@kylegilletmd]
• Gillette Health Podcast (YouTube, Apple Podcasts, Spotify)
• Lab panel reference lists: gillettehealth.com

This episode provides a thorough, nuanced look at the peptide landscape, striking a balance between the hype, the hope, and the hard-designed clinical caution needed for their use. Peptide therapy, while promising, carries distinct benefits and risks that should be considered with the help of a knowledgeable and open-minded physician.