Peptides Explained
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.
Episodes
Can Peptides Protect the Brain From Vascular Damage?
Can peptide biology protect the brain from vascular damage? John follows a question that started with Vesugen into the biology of vascular cognitive impairment—endothelial dysfunction, hypoperfusion, blood-brain-barrier injury, mitochondrial stress, inflammation and neuronal damage. The episode maps Cerebrolysin, SS-31/elamipretide, ARA-290/cibinetide, Semax, Vesugen and GLP-1 receptor agonists on
What the Heck Is Visceral Fat? (And Why People Keep Getting It Wrong)
Everyone keeps calling belly fat "visceral fat." That is not how anatomy works. In this crossover episode, John breaks down the difference between visceral and subcutaneous fat, why visceral adipose tissue matters metabolically, how it is actually measured, what waist circumference can and cannot tell you, and what the evidence says about GLP-1 therapies and tesamorelin.
Vesugen and Vascular Aging: Interesting Biology or Overhyped Claim?
Vesugen is only three amino acids long: lysine, glutamate, and aspartate — KED. Yet it is promoted as a vascular bioregulator that may support endothelial health and even "rejuvenate" aging blood vessels. In this episode, John Garrett looks at what the endothelial research actually measured, the proposed gene-regulation mechanism, a small human blood-flow report, and the large gap between an inter
FLGR-242 Explained: Smarter Follistatin—or Unproven Hype?
FLGR-242 is being called a smarter, longer-acting follistatin. John examines the advertised construct, the activin-sparing and 19-day half-life claims, the difference between pathway evidence and product evidence, and why transformation photos cannot establish pharmacology or safety.
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 differe
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 bio
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 c
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 compar
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 frag
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
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 da
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
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. Th
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 m
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 ques
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.
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 diagn
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 actu
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
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-ret
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 repro
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 regulat
**Special Announcement** Healthcare Provider Webinar
The State of Peptides 2026 | Clinician Webinar The peptide landscape is changing rapidly. New research is emerging, regulatory decisions continue to shape clinical practice, and healthcare providers are being asked more questions than ever before. Join Peptide Solutions for a live clinician-focused webinar covering the current state of peptides in 2026. This educational session is designed for phy
The 11 Peptides I Find Most Compelling
After researching peptide science week after week—and using some compounds personally—I'm answering one of the most common questions I receive: Which peptides do I find the most useful and compelling? This is not a universal ranking or a recommendation to use all 11. Tirzepatide, retatrutide, tesamorelin, ipamorelin, BPC-157, TB-500, GHK-Cu, KPV, PT-141, MOTS-c, and SS-31 occupy very different evi
Cagrilintide vs GLP-1s: A Different Appetite Pathway?
GLP-1 medications changed obesity treatment, but appetite regulation involves more than one hormonal signal. Cagrilintide is a long-acting analogue of amylin, a pancreatic peptide released alongside insulin that helps regulate satiety, gastric emptying, and post-meal glucagon signaling. In this episode of Peptides Explained, John Garrett breaks down what cagrilintide is, how it differs from GLP-1
AOD-9604 Explained: Can a Growth Hormone Fragment Burn Fat?
AOD-9604 is often marketed as the "fat-burning fragment" of human growth hormone. But what does it actually do, and did it work in human obesity trials? In this episode of Peptides Explained, John Garrett, RN, breaks down: • What AOD-9604 is and how it differs from full-length HGH • Lipolysis, lipogenesis, and beta-3 adrenergic signaling • Why animal studies looked promising • What the early human
SLU-PP-332 Explained: Exercise Mimetic or Experimental Hype?
SLU-PP-332 is being promoted as an "exercise mimetic" that may increase fat oxidation, endurance, and energy expenditure. But it is not actually a peptide, it is not FDA-approved, and the most compelling evidence comes from cell and mouse research—not human clinical trials. In this episode, John Garrett, RN, explains estrogen-related receptors, mitochondrial energy metabolism, the published precli
Why Boomers Are Living Longer But Not Healthier: Where Peptides May Fit Into Healthy Aging
Why are Americans living longer than ever before while spending more years battling chronic disease? In this episode of Peptides Explained, we explore one of the biggest questions in longevity medicine: the difference between lifespan and healthspan. You'll learn why muscle loss, metabolic dysfunction, chronic inflammation, mitochondrial decline, immune aging, and cognitive changes are major drive
NAD+ and Cancer: What the Science Actually Says
NAD+ is one of the most talked-about molecules in longevity and wellness. It is marketed for energy, mitochondrial support, cellular repair, brain fog, recovery, and anti-aging. But what happens when we bring cancer biology into the conversation? In this episode of Peptides Explained, we break down the relationship between NAD+ and cancer in clear, responsible language. NAD+ is essential for norma
DSIP Explained: The Sleep Peptide That Science Still Can't Explain
Description Can a tiny peptide discovered nearly 50 years ago hold the key to better sleep? In this episode of Peptides Explained, we explore Delta Sleep-Inducing Peptide (DSIP)—one of the most mysterious compounds in peptide research. Unlike many peptides discussed today, DSIP has no confirmed receptor, conflicting clinical data, and decades of unanswered questions. In this episode you'll learn:
5-Amino-1MQ Explained: NNMT, NAD⁺, and Fat Cell Metabolism
5-Amino-1MQ is often talked about in peptide circles, but it is not actually a peptide. It is a small-molecule NNMT inhibitor being studied for its potential role in nicotinamide metabolism, NAD⁺ biology, methylation, fat-cell function, insulin sensitivity, and liver metabolism. In this episode, John Garrett breaks down the proposed mechanism behind 5-Amino-1MQ, why people are discussing it for fa
BPC-157 & TB-500 for Dogs: Healing, Recovery & the Science | Veterinary Series Ep. 1
BPC-157 & TB-500 for Dogs: Healing, Recovery & the Current Science Welcome to Episode 1 of the Peptides Explained Veterinary Series. In this episode, we examine two of the most talked-about peptides in regenerative veterinary medicine—BPC-157 and TB-500. We'll discuss what researchers currently know about these experimental peptides, why they're generating interest among veterinarians and dog owne
I Asked ChatGPT to Build the Ultimate Peptide Stack... Here's What It Chose
I asked ChatGPT a simple question... and the answer surprised me. For Research Grade Peptides, check out Offline Peptides 🌐 OfflinePeptides.com/Ref/JohnGarrett If ChatGPT were a 47-year-old peptide researcher who needed to lose 40 pounds, had a nagging knee injury, wanted to preserve muscle, improve energy, and had an unlimited budget, what peptide stack would it choose? Instead of recommending
Epitalon Explained: The Science of Telomeres, Aging & Longevity
Can a peptide actually slow the aging process? In this episode of Peptides Explained, we take a deep dive into Epitalon—one of the most talked-about peptides in longevity medicine. You'll learn: What Epitalon is and where it came from How telomeres and telomerase work Why the pineal gland may play a role in aging What the human and animal research actually shows Why activating telomerase
SS-31 Explained: The FDA-Approved Mitochondrial Peptide
SS-31 (Elamipretide) may be one of the most fascinating peptides ever developed. Unlike most peptides that work by activating receptors on the surface of cells, SS-31 targets the mitochondria—the cellular power plants responsible for producing energy. In this episode of Peptides Explained, we break down: ✅ What mitochondria actually do ✅ The role of cardiolipin in cellular energy production ✅ How
Peptide Math Explained: Dose, Volume, Concentration & Reconstitution
Most peptide users understand what peptide they want to use, but many struggle with the math behind vial size, reconstitution, concentration, units, volume, and medication calculations. In this episode of Peptides Explained, we break down the fundamentals of peptide math in plain English. You'll learn the difference between total vial contents and dose, what reconstitution actually means, why conc
Melanotan I, Melanotan II & PT-141 Explained: The Tanning Peptides That Changed Sexual Medicine
What do tanning peptides have to do with sexual medicine? More than you might think. In this episode of Peptides Explained, we explore the fascinating science behind Melanotan I, Melanotan II, and PT-141 (Bremelanotide). What began as research into skin pigmentation and UV protection unexpectedly led to the development of an FDA-approved medication for hypoactive sexual desire disorder. You'll lea
Inside the Peptide Industry: Quality, Testing, Regulation & Grey Market Peptides
The founder of Offline Peptides joins Peptides Explained for a candid discussion about grey market peptides, quality control, regulation, and the future of the peptide industry. What are grey market peptides, and why have they become one of the fastest-growing topics in health, wellness, longevity, and performance? In this episode of Peptides Explained, host John Garrett sits down with Matthew Pac
KPV Explained: Gut Inflammation, Ulcerative Colitis, and the Science Behind the KLOW Blend
In this episode of Peptides Explained, we take a deep dive into KPV, a three-amino-acid peptide derived from alpha-melanocyte stimulating hormone (alpha-MSH) that has generated growing interest for its potential anti-inflammatory effects. We explore the biology behind KPV, how it may influence inflammatory pathways such as NF-kB, and why researchers have studied it in models of ulcerative colitis,
Selank vs Semax: The Russian Peptides for Anxiety, Focus, and Brain Health
In this episode of Peptides Explained, we take a deep dive into two of the most talked-about Russian research peptides: Selank and Semax. We'll explore where these peptides came from, how they work in the brain, and why researchers have studied them for anxiety, stress resilience, cognitive performance, neuroprotection, and stroke recovery. You'll learn about key mechanisms involving GABA, dopamin
Can Peptides Help Menopause? The Truth About Libido, Weight Gain & Aging
In this special episode of Peptides Explained, we're focusing on a topic that affects millions of women but often isn't discussed openly enough: menopause, hormonal signaling, libido, body composition, and the emerging role of peptides. Why does weight gain seem different during menopause? What causes the sudden changes in energy, sleep, skin, hair, and sexual desire? And where do peptides like Ki
GLP-1 Medications and the Brain | Mood, Anxiety, Motivation & Dopamine Explained
GLP-1 medications may affect far more than appetite and weight loss. In this episode, we explore the growing evidence surrounding semaglutide, tirzepatide, and retatrutide and their potential effects on mood, anxiety, dopamine signaling, motivation, and compulsive behavior. We discuss both the research and the real-world patient reports clinicians are increasingly hearing in practice.
Do Growth Hormone Peptides Cause Cancer? | The Truth About IGF-1
Do growth hormone secretagogues increase cancer risk? This episode breaks down the real science behind IGF-1, cancer biology, and compounds like MK-677, Ipamorelin, Sermorelin, CJC-1295, and Tesamorelin. We review: Human IGF-1 cancer studies Acromegaly data Tumor signaling pathways Observational vs causal evidence What current science actually supports This podcast is for informational purposes
BPC-157 and Cancer: What the Studies Actually Show
Does BPC-157 cause cancer — or is that claim being oversimplified? In this episode of Peptides Explained, we take a study-review approach to one of the biggest concerns surrounding BPC-157: its potential angiogenic effects and whether that could theoretically contribute to cancer proliferation. Angiogenesis means new blood vessel formation. It is essential for normal wound healing and tissue repai
Tesamorelin Explained: Visceral Fat, Growth Hormone & Real-World Outcomes
Tesamorelin is one of the few peptides with FDA approval—but its effects on visceral fat and growth hormone signaling have made it a major topic in metabolic health and body composition circles. In this episode of Peptides Explained, we break down: • What tesamorelin actually is • How growth hormone releasing hormone works • Why visceral fat matters metabolically • Clinical trial data and FDA-appr
Special Announcement: New Partnership for Peptides Explained
In this special update episode, I'm announcing a new affiliate partnership between Peptides Explained and Offline Peptides. The mission of this podcast remains unchanged: providing clear, responsible, science-based education around peptides, metabolic health, recovery, and emerging therapeutic research. If you choose to support the show through my affiliate link, I may earn a commission at no addi
Retatrutide Explained: The Triple Agonist Changing Obesity Medicine
Retatrutide may represent the next evolution in metabolic medicine. In this deep-dive episode of Peptides Explained, we break down the science behind the investigational "triple agonist" peptide that's generating major attention in obesity and metabolic research. Topics covered: • GLP-1 + GIP + glucagon receptor activation • How retatrutide differs from semaglutide and tirzepatide • Phase 2 clinic
Minimal Effective Dose: The Key to Preventing Muscle Loss on GLP-1s
Using the minimal effective dose of GLP-1 medications may be the key to preserving muscle during weight loss. This episode explains how to implement it alongside nutrition and training.
GLP-1 Drugs... Are They Destroying Muscle? — What Semaglutide, Tirzepatide & Retatrutide Data Actually Shows
A clinical deep dive into the muscle loss problem on GLP-1 medications. Semaglutide, tirzepatide, and the investigational triple agonist retatrutide all produce remarkable weight loss — but clinical trial data shows that a significant fraction of that loss is lean body mass, not fat. This episode covers the mechanism behind GLP-1-induced muscle wasting, the body composition data from STEP 1 and SU
The Peptide Ban Is Ending: FDA Officially Begins Reclassification Process for BPC-157, TB-500 & More
Breaking news episode. On April 15, 2026, the FDA formally initiated the reclassification process for BPC-157, TB-500, and other peptides restricted since 2023 — publishing a Federal Register notice and scheduling a July 2026 Pharmacy Compounding Advisory Committee meeting. This episode breaks down the full regulatory timeline, what the Category 1 vs Category 2 framework means, what today's action
Grey Market Peptides – Safety, Testing, and What You Need to Know
A clinical breakdown of grey market peptide safety, including contamination risks, testing standards, and how peptide quality impacts biological effects.
GHK-Cu Explained: The Science Behind the Copper Peptide for Skin, Hair, and Healing
GHK-Cu Explained: The Science Behind the Copper Peptide for Skin, Hair, and Healing
BPC-157 Deep Dive: Healing Mechanism, Dosing, TB-500 Stack & Why It's BANNED in Sports
A clinical deep dive into BPC-157 covering mechanism, recovery science, dosing patterns, TB-500 synergy, and why it is banned in professional sports.
Are Peptides Dangerous? The Truth About Safety, Regulation, and Off-Label Use
Are peptides dangerous—or just misunderstood? In this episode of Peptides Explained, we break down the real science behind peptide safety, how these compounds work in the body, and where risk actually exists. You'll learn: • what peptides are and how they function biologically • the difference between FDA-approved, compounded, and research peptides • what changed with peptide regulation and access
MOTS-C: The Mitochondrial Peptide for Metabolism and Insulin Sensitivity
MOTS-C is one of the most unique peptides being studied today — not because of what it does, but because of where it comes from. Unlike most peptides, MOTS-C is encoded inside your mitochondria, the part of the cell responsible for energy production. That makes it part of a growing category of mitochondrial signaling peptides that may play a role in metabolism, aging, and cellular energy regulatio
Do Growth Hormone Peptides Actually Work? CJC-1295, Ipamorelin & Sermorelin Explained
Growth hormone peptides are some of the most talked-about compounds in longevity medicine, metabolic health, and hormone optimization. But how do they actually work inside the body? In this episode of Peptides Explained, we break down the science behind four growth hormone secretagogues: Sermorelin, Tesamorelin, CJC-1295, and Ipamorelin. Instead of injecting growth hormone directly, these peptides
BPC-157 and TB-500 "The Wolverine Stack"
In Episode 3 of Peptides Explained, we take a closer look at two of the most talked-about peptides in injury recovery circles: BPC-157 and TB-500. These compounds are often combined in what's popularly called the "Wolverine Stack," a nickname that reflects claims of accelerated healing and recovery. But what are these peptides actually doing in the body, and what does the science really say? In th
GLP-1 Medications Explained: How Semaglutide, Tirzepatide, and Retatrutide Actually Work
GLP-1 medications are the most talked-about compounds in modern medicine — and the most misunderstood. Most of the conversation focuses on weight loss results. Almost none of it explains the biology driving those results. In this episode of Peptides Explained, we break down the science behind three of the most prescribed GLP-1 compounds: semaglutide, tirzepatide, and retatrutide. Topics covered in
What Are Peptides? The Building Blocks Behind Modern Therapeutic Compounds
Peptides are everywhere in the health and longevity conversation right now — but most of what's out there skips the fundamentals. Before you can understand semaglutide, BPC-157, or any other compound making headlines, you need to understand what a peptide actually is at the biological level. In this episode of Peptides Explained, we lay the foundation: What peptides are and how they differ from p
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