Understanding Peptide Receptors: A Complete Guide
A complete guide to peptide receptors: what receptors are, GPCRs and signal transduction, agonists vs antagonists, biased agonism, desensitization, and key examples.
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Research
Explainers on peptide biology, pharmacology and the published evidence behind individual compounds and research areas. These pieces distinguish cell and animal findings from human data and describe where the literature is thin, conflicting or not yet replicated.
79 articles by Brian Gossett. Read our editorial standards.
Mitochondrial Peptides: A Complete Guide
A complete guide to mitochondrial peptides: mitochondrial-derived peptides (MOTS-c, humanin, SHLPs), Szeto-Schiller peptides (SS-31), mechanisms, and research areas.
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What Is Myostatin?
Myostatin (GDF-8) is a negative regulator of skeletal muscle growth. Learn how it signals through ActRIIB, how follistatin inhibits it, and what null phenotypes show.
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What Is AMPK?
AMPK is the cell's master energy sensor. Learn how the AMP:ATP ratio activates it, what it switches on and off, and how it links to autophagy and metabolism.
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What Is mTOR?
mTOR is the cell's master growth regulator. Learn how mTORC1 and mTORC2 sense nutrients and growth factors, drive protein synthesis, suppress autophagy, and oppose AMPK.
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Understanding IGF-1 Signaling
IGF-1 relays growth hormone's anabolic signal. Learn the GH→IGF-1 axis, the IGF-1 receptor, PI3K/Akt/mTOR, IGF binding proteins, and the longevity trade-offs.
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The Growth Hormone Axis Explained
How GHRH, somatostatin, and ghrelin control pulsatile growth hormone release, how GH drives IGF-1, and where GH secretagogue peptides act in the axis.
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Brown Fat vs White Fat Explained
White fat stores energy; brown fat burns it for heat via UCP1. Learn the difference, what beige fat is, how browning works, and why it matters metabolically.
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Mitochondrial Biogenesis Explained
How cells build new mitochondria: PGC-1alpha as master regulator, AMPK and SIRT1 inputs, and the roles of exercise and NAD+ in driving biogenesis.
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Autophagy Explained
How autophagy works: macroautophagy, the autophagosome, mTOR and AMPK control, mitophagy, and the roles of fasting and aging in cellular self-cleaning.
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NAD+ Biology: The Cell's Central Metabolic Currency
A clear guide to NAD+ biology: its redox role, the salvage pathway, why NAD+ declines with age, the enzymes that consume it, and NR/NMN precursor context.
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Telomeres and Cellular Aging
How telomeres protect chromosomes, why they shorten with each division, the Hayflick limit, telomerase, cellular senescence, and their role in aging research.
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FOXO Pathways: Cellular Stress Resistance and Longevity
A clear guide to FOXO transcription factors: how insulin/IGF-1 and Akt regulate them, their role in stress resistance, autophagy, and longevity research.
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Sirtuins Explained: The NAD+-Dependent Longevity Enzymes
A clear guide to sirtuins (SIRT1-7): NAD+-dependent enzymes that regulate metabolism, mitochondria, and DNA repair, and their link to caloric restriction and aging.
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Melanocortin Receptors Explained (MC1R-MC5R)
The melanocortin system explained: MC1R-MC5R, POMC and alpha-MSH, and the receptors behind pigmentation, energy balance, and sexual function research.
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GLP-1 Biology Explained
How GLP-1 works: secretion from intestinal L-cells, the GLP-1 receptor, effects on insulin, satiety, and gastric emptying, and rapid DPP-4 degradation.
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GIP Biology Explained
How GIP works: secretion from intestinal K-cells, the GIP receptor, roles in insulin and fat tissue, and why GIP + GLP-1 synergy powers tirzepatide.
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Glucagon Biology Explained
How glucagon works: secretion from pancreatic alpha-cells, the glucagon receptor, hepatic glucose output, energy expenditure, and its role in triple agonists.
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Peptides for Inflammation: What the Research Shows
A research-based guide to peptides studied for inflammation — BPC-157, KPV, Thymosin Alpha-1, TB-500, LL-37, and VIP. How each works, the evidence behind it, and where to source research-grade material.
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Peptides for Alzheimer's: What the Research Shows
A research-based look at peptides studied for Alzheimer's and cognitive decline — Cerebrolysin, Dihexa, Semax, Selank, Humanin, and P21. Mechanisms, evidence quality, and research-grade sourcing.
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Peptides for Back Pain: What the Research Shows
A research-based guide to peptides studied for back pain — BPC-157, TB-500, and GHK-Cu. How each supports tissue and nerve recovery, the evidence behind them, and where to source research-grade material.
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Peptides for Nerve Pain: What the Research Shows
A research-based guide to peptides studied for nerve pain and neuropathy — ARA-290, BPC-157, Dihexa, Semax, and Selank. Mechanisms, evidence quality, and research-grade sourcing.
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Peptides for Cartilage Repair: What the Research Shows
A research-based guide to peptides studied for cartilage repair — BPC-157, TB-500, and GHK-Cu. How each supports joint and connective tissue, the evidence behind them, and where to source research-grade material.
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Retatrutide: History, Trials, FDA Status & Mechanism
An in-depth look at retatrutide (LY3437943) — the triple GIP/GLP-1/glucagon agonist. History, Phase 2 and Phase 3 clinical trial data, FDA approval status, mechanism of action, and known and speculative downstream effects.
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SS-31 (Elamipretide): History, Trials, FDA Status & Mechanism
An in-depth research overview of SS-31 / elamipretide — the cardiolipin-targeting mitochondrial peptide. Discovery history, clinical trials, FDA regulatory status, mechanism of action, and known and speculative downstream effects.
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Tirzepatide (Mounjaro/Zepbound): History, Trials, FDA Approval & Mechanism
A detailed research overview of tirzepatide — the dual GIP/GLP-1 agonist sold as Mounjaro and Zepbound. History, SURPASS and SURMOUNT trials, FDA approval timeline, mechanism of action, and known and speculative downstream effects.
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Tesamorelin (Egrifta): History, Trials, FDA Approval & Mechanism
A detailed research overview of tesamorelin (Egrifta) — the GHRH analog approved for HIV lipodystrophy. History, Phase 3 trials, FDA approval process, mechanism of action, and known and speculative downstream effects.
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Semaglutide (Ozempic/Wegovy): History, Trials, FDA Approval & Mechanism
A detailed research overview of semaglutide — the GLP-1 agonist sold as Ozempic, Wegovy, and Rybelsus. History, SUSTAIN/STEP/SELECT trials, FDA approval timeline, mechanism of action, and known and speculative downstream effects.
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HCG (Human Chorionic Gonadotropin): History, Uses, FDA Status & Mechanism
A detailed research overview of hCG (human chorionic gonadotropin) — its discovery, clinical uses in fertility and hypogonadism, FDA approval status and weight-loss warnings, mechanism as an LH analog, and known and speculative effects.
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What Is Mitochondria, and Why Is It Important?
What mitochondria are, why they matter for energy, aging, and metabolic health, and the research peptides — MOTS-c, SS-31, Humanin — studied for mitochondrial function.
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Non-Traditional Cancer Treatments: What the Research Actually Shows
An evidence-focused look at non-traditional and experimental cancer research, including anticancer peptides like PNC-27 and Thymosin alpha-1 — what's promising, what's unproven, and why context matters.
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Experimental Autoimmune Treatment Methods Worth Understanding
A research-focused overview of experimental autoimmune approaches that get less attention in conventional care — immune-modulating peptides like Thymosin alpha-1, BPC-157, KPV, and the gut-immune connection.
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Healing After an Injury Without Traditional Pharmaceuticals
Research-backed approaches to injury recovery beyond NSAIDs and opioids — the body's natural healing process, lifestyle foundations, and peptides like BPC-157, TB-500, and GHK-Cu studied for tissue repair.
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Natural Medication Options: An Evidence-Based Guide
A grounded look at natural medication options — signalling peptides, botanicals, micronutrients, and lifestyle — what the research supports, where the limits are, and why 'natural' doesn't mean risk-free.
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What Peptides Should I Take? A Goal-by-Goal Guide for Researchers
Not sure which peptides to start with? This guide breaks down the best-researched options by goal — recovery, sleep, longevity, cognition, and more — so you can make an informed decision.
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How to Use Peptides: Reconstitution, Dosing, and Injection Guide
Step-by-step guide to reconstituting, dosing, and injecting research peptides correctly. Covers bacteriostatic water, injection technique, storage, and nasal spray alternatives.
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Are Peptides Safe? Side Effects, Risks, and What the Research Shows
A research-based look at peptide safety across commonly studied compounds. What the published literature shows about side effects, risks, and situations where caution is warranted.
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Do Peptides Work? Evidence, Research, and Realistic Expectations
An honest, compound-by-compound look at the evidence for research peptides — what the studies actually show, where the data is strong, and where extrapolation outpaces the science.
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How Tesamorelin Works: The GH Axis Explained
A detailed explanation of how tesamorelin works — the GH axis, GHRH receptor binding, pituitary feedback preservation, and what clinical trials show about its effects on visceral fat, IGF-1, and cognition.
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GHK-Cu and Skin Regeneration: What the Research Shows
A research-based review of GHK-Cu (copper peptide) and skin regeneration — mechanisms of action, clinical and preclinical study findings, delivery methods, and what the evidence actually supports.
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Peptides vs SARMs: Key Differences Explained
Peptides vs SARMs: a detailed comparison of mechanisms, hormonal effects, safety profiles, legal status, and use-case applications. Understand the key differences before researching either compound class.
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Best Peptides for Fat Loss: Semaglutide, Tirzepatide, Retatrutide, Adipotide & More
A research-based guide to the best peptides for fat loss — covering Semaglutide, Tirzepatide, Retatrutide, Adipotide, and Tesofensine. Mechanisms, clinical trial data, dosing, and honest research status for each.
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BPC-157: Mechanism of Action, Research, and Applications
A detailed review of BPC-157 — its mechanism of action, animal study findings across tendon, GI, muscle, and neurological models, use-case scenarios, and research context.
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Tesamorelin vs Ipamorelin: What's the Difference?
Tesamorelin vs Ipamorelin compared: mechanisms, potency, dosing, FDA status, and which is better for your research goals. Includes a full side-by-side chart and stack protocol.
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Ipamorelin vs CJC-1295: What's the Difference?
Ipamorelin vs CJC-1295: a detailed comparison of mechanisms, dosing, half-life, and why they're so often stacked together. Includes protocol examples and a side-by-side chart.
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Peptide Dosing Guide: Beginner to Advanced Protocols
A complete peptide dosing guide for beginners and advanced researchers. Includes dosing charts for injectable and nasal peptides, protocol structures, and safety guidelines.
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Best Peptides for Muscle Growth in 2026 | Tesamorelin, Ipamorelin, IGF-1 LR3, MK-677
A complete breakdown of the best peptides for muscle growth: Tesamorelin, Ipamorelin, IGF-1 LR3, MK-677, and MK-777. How each works, how to dose them, and how to stack them for maximum effect.
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Best Peptides for Injury Recovery in 2026 | BPC-157, TB-500, GHK-Cu
The best peptides for injury recovery: BPC-157, TB-500, GHK-Cu, Ipamorelin, and KPV. How each works, how to dose them, and how to stack them for tendons, ligaments, muscle, and joints.
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Best Peptides for Memory and Cognitive Function in 2026 | Dihexa, Cerebrolysin, Semax
The best peptides for memory and cognitive function: Dihexa, Cerebrolysin, Semax, Selank, Epithalon, and NAD+. How each works, research backing, dosing protocols, and stacking strategies.
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Best Peptides for Weight Loss in 2026 | Semaglutide, Tirzepatide, AOD-9604, Adipotide
The best peptides for weight loss: Semaglutide, Tirzepatide, Retatrutide, AOD-9604, Adipotide, and Tesamorelin. How each works, clinical data, dosing, and how to build a multi-mechanism fat loss protocol.
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BPC-157 Dosage: Complete Protocol Guide (Oral vs Injection)
Full BPC-157 dosage guide covering subcutaneous injection protocols (200–500mcg), oral dosing for gut health (1–2mg), cycle lengths, timing, and loading vs maintenance phases.
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How Long Does BPC-157 Take to Work? Timeline & Effects
Detailed timeline of when BPC-157 starts working — from days 1–3 anti-inflammatory effects to 2–8 week tendon and tissue healing. Honest look at what animal studies show and factors that affect speed.
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BPC-157 Side Effects: What the Research Actually Shows
A research-based review of BPC-157 side effects — reported effects, what animal studies show, theoretical concerns, and who should avoid it. Includes sourcing quality as a safety variable.
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BPC-157 vs TB-500: Which Is Better for Recovery?
Detailed comparison of BPC-157 vs TB-500 — mechanism, distribution, dose, gut vs systemic applications, cardiac data, and why they're complementary in the Wolverine Stack.
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Mechanism of BPC-157: How It Repairs Tissue
Detailed explanation of BPC-157's tissue repair mechanisms — NO system modulation, VEGF angiogenesis, EGF upregulation, tendon fibroblast activation, and gut mucosal protection.
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Clinical & Preclinical Studies on BPC-157 Explained
A plain-language guide to the key BPC-157 research studies — by tissue type (tendon, gut, nerve, bone, muscle), the Sikiric lab's work, Phase 2 human IBD trial status, and how to read animal study evidence.
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CJC-1295 + Ipamorelin Dosage Protocol (With & Without DAC)
Complete CJC-1295 and Ipamorelin dosage guide — No DAC vs With DAC dosing, stacking protocols, injection frequency, cycle length, and timing (pre-sleep vs fasted) explained.
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Best Time to Take CJC-1295 for Fat Loss & Growth Hormone
The best time to inject CJC-1295 for maximum GH release — why pre-sleep dosing dominates, the role of fasted state, morning dosing, and how insulin timing affects fat loss results.
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CJC-1295 vs Sermorelin: Which Is Better?
Full comparison of CJC-1295 vs Sermorelin — half-life, potency, clinical history, prescription availability, dosing, and which is better depending on your research goals.
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Ipamorelin Side Effects: Real Risks vs Myths
Honest breakdown of Ipamorelin side effects — real reported effects (water retention, fatigue, hunger), myths debunked (cortisol, prolactin, gyno), GHRP comparison, and who should avoid it.
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Can You Take CJC-1295 Alone (Without Ipamorelin)?
Yes, CJC-1295 can be taken alone — but how effective is it? Mechanism explanation, what happens without Ipamorelin, solo No DAC vs With DAC use cases, and when the stack is better.
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How Growth Hormone Peptides Work: Simple Explanation
Plain-language explanation of how GH peptides work — the pituitary GH axis, GHRH analogues vs GHRPs, how GH pulses are generated, and what happens when you stack both types.
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GHRH vs GHRP Peptides: Key Differences Explained
The difference between GHRH analogues (CJC-1295, Sermorelin, Tesamorelin) and GHRPs (Ipamorelin, GHRP-6, GHRP-2) — how each class works, why stacking produces synergistic GH release, and which to choose.
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Semaglutide Dosage Guide: Weekly Protocol Explained
Complete semaglutide dosage guide — standard titration from 0.25mg to 2mg, why slow titration matters, GI management tips, missing doses, and research compound context.
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Tirzepatide vs Semaglutide: Which Is Stronger?
Head-to-head comparison of tirzepatide and semaglutide — mechanism (GLP-1 vs dual GIP+GLP-1), trial data (22.5% vs 15% weight loss), side effects, cost, and when each is preferred.
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Tesofensine Results: How Fast Does It Work?
Tesofensine trial data, mechanism (triple monoamine reuptake inhibitor), Phase 2 results (12.8% weight loss vs 2.2% placebo), timeline of effects, why it stalled, and current research status.
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Best Peptides for Fat Loss (Ranked by Evidence)
Peptides and weight loss compounds ranked by evidence strength — Tier 1 (semaglutide, tirzepatide), Tier 2 (CJC-1295/Ipamorelin), Tier 3 (AOD-9604, tesamorelin) with scoring breakdown.
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Why Some People Don't Lose Weight on Semaglutide
6 evidence-based reasons semaglutide doesn't work for some people — GLP-1 receptor variants, diet quality, muscle loss, psychological eating, dose insufficiency, and weight regain after stopping.
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How GLP-1 Agonists Work for Weight Loss
Plain-language explanation of GLP-1 mechanisms — endogenous role, receptor locations (gut, brain, pancreas), four weight loss mechanisms, and why GLP-1 agonists are more powerful than willpower alone.
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Insulin Sensitivity, Appetite & Peptides Explained
How insulin resistance drives weight gain and hunger, GLP-1's effect on insulin sensitivity, appetite hormones (ghrelin, leptin, PYY, GIP), GH secretagogues and insulin — both sides explained.
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Semax vs Selank: Which Is Better for Focus & Anxiety?
Semax vs Selank comparison: mechanism, receptor targets, effect profiles, half-life. When to choose Semax (drive, BDNF), Selank (anxiolytic, calm focus), or both together.
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DSIP for Sleep: Does It Actually Work?
DSIP (Delta Sleep-Inducing Peptide) review: EEG research showing delta wave increase, cortisol normalisation data, honest assessment of animal vs human evidence, and comparison to pharmaceutical sleep aids.
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Best Peptides for Focus and Productivity
Best peptides for focus and work performance: Semax (drive + BDNF), Selank (anxiety-free focus), Dihexa (synaptic formation). Stack options, work day protocol, and sourcing links.
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Stacking Nootropic Peptides Safely
How to stack nootropic peptides safely: Semax + Selank (most common), adding DSIP for sleep, combinations to avoid, cycling protocol, and start-low principles for research use.
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How Nootropic Peptides Affect the Brain
Mechanism deep-dive: how nootropic peptides cross or bypass the BBB, BDNF and NGF upregulation, synaptic plasticity effects, neurotransmitter modulation, and neuroprotection via Semax, Selank, and Dihexa.
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Neurotransmitters and Peptide Modulation Explained
How peptides modulate neurotransmitters: BPC-157 on dopamine and serotonin, Selank's GABAergic anxiolytic action, Semax's dopaminergic and BDNF effects. Why peptides aren't just physical recovery tools.
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Epitalon Protocol: Anti-Aging and Longevity Guide
Complete Epitalon protocol: telomerase activation mechanism, pineal gland support, dosing (5-20mg for 10-20 days, 1-2x per year), injection vs nasal vs oral, and Khavinson's human longevity study data.
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Thymalin Benefits for Immune Function
Thymalin (thymus bioregulator) benefits for immune function: restores T-cell production, reverses thymic involution, improves NK cell activity. Khavinson study data and 10-day protocol guide.
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Best Peptides for Beginners (2026 Guide)
Top 5 peptides for beginners in 2026: BPC-157 (#1), GHK-Cu (#2), Epitalon (#3), Ipamorelin (#4), Semax (#5). Evidence quality, safety profiles, delivery options, and what to avoid as a first-time researcher.
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