Peptides Explained

John Garrett

Peptides Explained breaks down the most talked-about peptides and GLP-1 medications in health, fitness, and longevity — including semaglutide, tirzepatide, BPC-157, TB-500, and more.

Hosted by Registered Nurse John Garrett, this podcast explains how these compounds work, why they're popular, what the research shows, and the real risks and side effects — all in plain language.

No bro science. No hype. Just clear, foundational education.

For informational purposes only. Not medical advice.

For Research Peptides; Offlinepeptides.com/ref/johngarrett/
https://www.skool.com/peptides-explained-15

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39 episodes
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Yesterday · 10 min· Video
Follistatin Explained: Can You Really Remove the Muscle-Growth Brake?
Follistatin can bind myostatin—one of the body's major restraints on skeletal-muscle growth. Animal studies are dramatic, and small human gene-therapy studies have produced encouraging signals in serious muscle disease. But is a vial labeled "Follistatin-344" equivalent to the therapy used in those trials? John Garrett explains FST288, FST315, and FST344; the myostatin/activin pathway; the difference between gene therapy and recombinant protein; the evidence for muscle size versus function; and the key safety and product-identity questions. Follistatin is not an FDA-approved muscle-building medication. Educational content only; not medical advice. Explore the free Peptides Explained app: https://app.peptidesexplained.info
Monday · 15 min· Video
Glutathione: The "Master Antioxidant" — or Master Marketing?
Glutathione gets called the "master antioxidant," and the underlying biology really is important. But does that mean oral supplements, liposomal products or glutathione IVs deliver the sweeping detox, energy, immune and anti-aging benefits often attached to them? John breaks down glutathione biology, the GSH/GSSG cycle, oral human data, NAC, skin-related research and the gap between changing a biomarker and changing a meaningful health outcome. The episode also covers the 2026 FDA warning and recalls involving compounded injectable glutathione and elevated endotoxin levels. The key question: where does established biology end and wellness marketing begin? Educational only. Not medical advice.
September 23 · 13 min· Video
GLP-1 Split Dosing: This Is NOT Microdosing
For more information on Research Peptides go to PeptidesExplained.info/OfflinePeptides Is taking smaller GLP-1 doses multiple times per week actually "microdosing"? Not necessarily. This episode separates split dosing from true dose reduction and explains the pharmacokinetic logic using semaglutide, tirzepatide, and retatrutide. John breaks down half-life, peaks, troughs, total exposure, and why changing the schedule does not automatically mean using less drug. We also examine the major evidence gap: once-weekly dosing has a strong clinical foundation for semaglutide and tirzepatide, while retatrutide remains investigational — and direct randomized evidence showing routine split dosing is superior is not established. Educational only. No individualized dosing protocols are provided.
September 21 · 18 min· Video
Icotyde: The Oral Peptide That Could Change Medicine
Download The Peptide App at ThePeptide.App/Explained For more information on research peptides check out PeptidesExplained.info/OfflinePeptides A peptide…in a pill? Icotyde, or icotrokinra, is an FDA-approved oral peptide designed to block the IL-23 receptor in moderate-to-severe plaque psoriasis. In Phase 3 trials, it produced substantial skin clearance and outperformed an established oral comparator on several key endpoints. But the biggest story may be the delivery platform itself. Peptides usually struggle to survive the digestive tract and reach circulation. Icotyde shows what can happen when medicinal chemistry, structural engineering and extreme receptor potency come together. This episode breaks down what worked, what the safety data show, and what this does—and does not—mean for the future of oral peptides. Educational only. Not medical advice.
September 16 · 17 min· Video
Why Your Favorite Peptides May Never Get a Big Human Trial
If BPC-157, TB-500, KPV, MOTS-C and similar peptides are so interesting, why don't we have giant randomized human trials? This episode looks at the less dramatic—and more important—answer: clinical trials require a sponsor, regulatory strategy, manufacturing package, defined indication, safety program, and a very large amount of money. For old, easily copied, poorly protected, or commercially fragmented compounds, the incentive to fund definitive trials may be weak. John also explains why that does not excuse the evidence gap. "No Phase 3 trial" is not proof that a peptide works. It simply means confidence should remain limited until better evidence exists. Educational only. Not medical advice.
September 14 · 18 min· Video
The Hollywood Trinity Stack: What Happened When I Tried It
Download The Peptide App @ ThePeptide.App/Explained For more info on research peptides visit PeptidesExplained.info/OfflinePeptides John Garrett shares his N=1 experience with the so-called "Trinity Stack"—established TRT, retatrutide, and tesamorelin—combined with resistance training, Zone 2 cardio, high protein intake, creatine, sauna, and cold plunging. The transformation was dramatic. But what likely came from appetite control? What helped preserve muscle? What might the GH/IGF-1 axis have added? And how much credit belongs to the boring fundamentals? This is a candid personal testimony and accessible science breakdown—not a deep dive, a dosing guide, or a warning lecture. John also explains what happened during an eight-week break and why he recently restarted with a goal of reaching 10% body fat. Educational only. Retatrutide remains investigational and is not FDA-approved.
September 9 · 14 min· Video
SNAP-8: Is "Botox in a Bottle" Real?
SNAP-8 is a synthetic cosmetic octapeptide marketed for expression lines and frequently called "Botox in a bottle." John Garrett, RN, breaks down the SNAP-25 and SNARE-complex mechanism, the difference between topical SNAP-8 and injected botulinum toxin, the skin-penetration problem, the Argireline evidence, a small 2024 microneedle combination study, safety, and the limits of the current human data. The mechanism is plausible. The evidence is not strong enough to call it a needle-free Botox equivalent. Educational content only; not medical advice.
September 7 · 23 min· Video
GLP-1 Microdosing: Smart Strategy or the Next Wellness Fad?
Visit peptidesexplained.info for more info and resources For more info on research peptides check out PeptidesExplained.info/OfflinePeptides or email John at john@peptidesexplained.info What exactly is GLP-1 microdosing? Depending on who you ask, it can mean remaining on the starter dose, taking a fraction of that dose, spacing injections farther apart, stepping down after weight loss, or using a tiny amount for food noise and longevity. Those are not the same strategy. John Garrett breaks down the new low-dose semaglutide and tirzepatide data, FDA-approved dose structures, weight-regain research, maintenance questions, side effects, and the major gap between individualized clinical titration and social-media "microdosing" protocols. Educational content only. Not medical advice.
September 2 · 15 min· Video
Thymalin vs Thymogen: Can Thymus Peptides Reverse Immune Aging?
Can a peptide reverse age-related immune decline? Thymalin and Thymogen are often discussed together, but one is a complex calf-thymus extract and the other is the defined dipeptide Glu-Trp. John Garrett explains thymic involution, T-cell biology, proposed mechanisms, the Russian clinical history, limitations of the human evidence, safety, and U.S. regulatory status. The science is interesting. The "immune rejuvenation" and life-extension claims remain unproven. Educational only. Not medical advice.
August 31 · 22 min· Video
What Is Pinealon? Brain Aging, Neuroprotection, and the Evidence
Check out The Peptide App here: thepeptide.app/explained What is Pinealon, and does this three-amino-acid peptide really protect the aging brain? Pinealon—also called EDR or Glu-Asp-Arg—is a synthetic tripeptide associated with the Khavinson bioregulator research program. It is discussed for memory, neuroprotection, oxidative stress, brain aging, and even Alzheimer's disease, but the evidence is much more complicated than the marketing language suggests. John Garrett, examines Pinealon's proposed mechanism, cell and animal research, a newer induced-neuron study, and the PubMed-indexed human reports that are often overlooked. The episode also explains why Pinealon is different from Epitalon, where the human evidence is weak, what remains unknown about brain exposure and long-term safety, and why a plausible mechanism is not the same thing as an established cognitive therapy. Educational content only. Not medical advice.
August 30 · 19 min· Video
Khavinson Peptide Bioregulators: What Do They Actually Do?
What are Khavinson peptide bioregulators, and what do they actually do? John Garrett examines the Russian research tradition behind organ-derived peptide complexes and synthetic ultrashort peptides. This episode explains the proposed gene-expression mechanism, the claim of tissue specificity, common examples such as Thymalin and Epitalon, the limitations of the human evidence, oral absorption questions, product-quality concerns, safety, and U.S. regulatory status. The science is more interesting than a simple dismissal—but less proven than organ-rejuvenation marketing suggests. This episode is educational and is not medical advice.
August 30 · 21 min· Video
Did Your GLP-1 Stop Working? Appetite, Receptors and Weight-Loss Plateaus
Does a weight-loss plateau mean your GLP-1 receptors have become desensitized? John separates cellular receptor biology from whole-body weight regulation and compares semaglutide, tirzepatide, and investigational retatrutide. We examine appetite suppression, food noise, gastric-emptying tachyphylaxis, metabolic adaptation, switching therapies, and what the clinical evidence can—and cannot—tell us. A plateau is real. "Receptor burnout" is a much bigger claim. Educational only; not medical advice.
August 26 · 19 min
Khavinson Peptide Bioregulators: What Do They Actually Do?
What are Khavinson peptide bioregulators, and what do they actually do? John Garrett examines the Russian research tradition behind organ-derived peptide complexes and synthetic ultrashort peptides. This episode explains the proposed gene-expression mechanism, the claim of tissue specificity, common examples such as Thymalin and Epitalon, the limitations of the human evidence, oral absorption questions, product-quality concerns, safety, and U.S. regulatory status. The science is more interesting than a simple dismissal—but less proven than organ-rejuvenation marketing suggests. This episode is educational and is not medical advice.
August 24 · 21 min
Did Your GLP-1 Stop Working? Appetite, Receptors and Weight-Loss Plateaus
Peptide-solutions.info App.peptidesexplained.info Does a weight-loss plateau mean your GLP-1 receptors have become desensitized? John separates cellular receptor biology from whole-body weight regulation and compares semaglutide, tirzepatide, and investigational retatrutide. We examine appetite suppression, food noise, gastric-emptying tachyphylaxis, metabolic adaptation, switching therapies, and what the clinical evidence can—and cannot—tell us. A plateau is real. “Receptor burnout” is a much bigger claim. Educational only; not medical advice.
August 20 · 18 min
Should You Be Using Peptides? The Honest Answer
Visit Peptide-Solutions.info for more info Check out App.PeptidesExplained.info Should you be using peptides? The honest answer is that not everyone should. Peptides are not a nutritional requirement, a shortcut to better health, or something you need simply because they are trending. But some people do have a defined problem—such as obesity, metabolic disease, an injury, loss of function, a diagnosed hormone-related condition, or another health issue—for which a peptide-based medication or investigational compound may be relevant. In this episode, John Garrett, explains how to decide whether a peptide belongs in the conversation. You will learn how to start with the problem rather than the product, compare FDA-approved, off-label, compounded, experimental, and research-use categories, evaluate human versus animal versus anecdotal evidence, identify better-established alternatives, and build a plan for monitoring and stopping. This episode also points viewers to "The 11 Peptides I Find Most Compelling" and the individual Peptides Explained deep dives for compound-specific education. This content is educational only and is not medical advice. Speak with a qualified healthcare professional before starting, stopping, or changing any therapy.
August 18 · 17 min
ARA-290: Can It Repair Small Nerve Fibers?
ARA-290, also called cibinetide, is an investigational 11-amino-acid peptide designed from erythropoietin biology to activate tissue-protective signaling without stimulating red-blood-cell production. In this episode, John Garrett, RN, breaks down the innate repair receptor, why ARA-290 has been studied in small-fiber neuropathy, what randomized human trials in sarcoidosis and type 2 diabetes actually found, and why objective nerve-fiber signals are interesting—but not the same thing as an approved therapy. You'll learn: • What ARA-290/cibinetide is • How it differs from full-length erythropoietin • What the innate repair receptor is • Why researchers studied corneal nerve fibers • What the 22-patient pilot trial showed • What the 64-patient phase 2b trial showed • Why pain and nerve-fiber endpoints did not tell exactly the same story • What is known—and not known—about safety • Why online ARA-290 products should not be assumed equivalent to trial material Explore the Peptides Explained app: app.peptidesexplained.info Learn more through Peptide Solutions: peptide-solutions.info Educational content only. ARA-290 is investigational and is not an FDA-approved treatment for neuropathy or any other clinical indication.
August 12 · 15 min
Lipo-C Injections: What Do They Actually Do?
Check out Peptide.Solutions.info/Pathways and submit a request to see what companies I have partnered with to get products. Lipo-C injections are often marketed for fat burning, energy, liver support, or breaking a weight-loss plateau. But "Lipo-C" is not one standardized formula—and real metabolic biology is not the same thing as proven fat loss. In this episode, John Garrett, RN, breaks down the ingredients commonly found in Lipo-C blends, including L-carnitine, choline, methionine, inositol, and B vitamins. We examine what each ingredient actually does, what human studies of L-carnitine suggest, why that evidence cannot automatically be applied to a compounded injection, and the questions to ask before paying for one. You'll learn: • Why two products called Lipo-C may be completely different • How carnitine participates in mitochondrial fatty-acid oxidation • What "lipotropic" does—and does not—mean • Whether Lipo-C is FDA approved • What people report versus what trials establish • Risks, limitations, and when provider involvement matters Explore the Peptides Explained app: app.peptidesexplained.info Learn more through Peptide Solutions: peptide-solutions.info Educational content only. This is not medical advice or a recommendation to use an injectable product.
August 10 · 23 min
FOXO4-DRI: Can It Really Remove Senescent Cells and Reverse Aging?
FOXO4-DRI has been called a "zombie-cell killer," a senolytic peptide, and even a possible anti-aging breakthrough. The mechanism is fascinating—but the claims have moved much faster than the human evidence. In this episode, John explains what senescent cells are, why they are not automatically harmful, and how FOXO4 and p53 help regulate cell survival and cell death. He then breaks down the D-retro-inverso design of FOXO4-DRI, the proposed mechanism, and what the original 2017 research actually found in cultured human cells and mice. The episode also examines what has happened since that first study, why removing senescent cells may produce different effects in different tissues, and what the cancer, tissue-repair, regulatory, and long-term safety questions really look like. The bottom line: FOXO4-DRI is a scientifically credible experimental senolytic with compelling preclinical biology—but it has not been proven to reverse aging or provide clinical benefit in humans. Explore the Peptides Explained App: https://app.peptidesexplained.info Peptide Solutions: If you are interested in checking out Compounded or Research Peptide Sources visit Peptide Solutions. https://peptide-solutions.info This episode is educational and is not individualized medical advice. FOXO4-DRI is experimental and is not an FDA-approved medication.
August 5 · 22 min
ATX-304: AMPK Activation, Metabolic Demand, and the Limits of "Exercise in a Pill"
ATX-304 is often called "exercise in a pill," but it is more accurate to describe it as an investigational oral small molecule that activates AMPK and alters mitochondrial energy demand. John explains the mechanism, the preclinical metabolic findings, the early human signal in type 2 diabetes, the current obesity-development strategy, and the major gaps that remain before anyone can claim it reproduces the health effects of exercise. Batch tested and they have COAs available on all peptides https://www.americanpeptides.us/discount/JOHNATHAN10?ref=SteWwgMLys Or use Johnathan10 at checkout 2. Offline Peptides Based in Texas Batch tested and they have COAs available on all peptides Visit; OfflinePeptides.com/ref/JohnGarrett I am an affiliate with each of these companies. If you use my link I may earn a commission at no extra cost to you. All information on this podcast is for educational and not meant as medical advice.
August 3 · 19 min
Thymosin Alpha 1: What Does It Do?
Thymosin alpha 1—also called Tα1 or thymalfasin—is frequently described online as an "immune-boosting peptide." But that phrase oversimplifies a complicated biological system. In this episode of Peptides Explained, John Garrett breaks down how thymosin alpha 1 may influence dendritic cells, Toll-like receptor signaling, T-cell maturation, natural-killer-cell activity, cytokines, and immune regulation. The episode also reviews where it has been studied, including chronic viral hepatitis, vaccine response, oncology-support settings, severe infection, pancreatitis, and sepsis. The evidence is not uniformly positive. Earlier sepsis trials and pooled analyses suggested benefit, but a large multicenter phase 3 trial involving more than 1,100 adults found no reduction in 28-day mortality. That contrast illustrates why biological mechanisms and small clinical studies must be separated from confirmed patient outcomes. The episode also covers: • What thymosin alpha 1 is • Why "immune modulator" is more accurate than "immune booster" • Innate versus adaptive immunity • Human clinical evidence versus cell and animal research • International approval versus U.S. FDA status • FDA concerns involving compounded thymosin alpha 1 • Potential risks, product-quality concerns, and major unknowns • A responsible decision framework for evaluating immune-peptide claims This content is for education and discussion only and is not medical advice. Always consult a qualified healthcare professional before starting, stopping, or changing any therapy. Peptides Explained is an affiliate partner with OfflinePeptides.com. If you use the link below, I may earn a commission at no additional cost to you. PeptidesExplained.info/OfflinePeptides #ThymosinAlpha1 #Thymalfasin #PeptidesExplained #ImmuneSystem #Immunology #PeptideScience #TCells #Longevity #Peptides #MedicalEducation

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