Independent peptide research
Peptide research & education — evidence-based compound guides
PeptideMark is the most comprehensive evidence-based peptide reference on the internet. Every claim cited. Every compound evidence-rated. No hype, no vendor influence — just research.
Featured compounds
View allBPC-157Body Protection Compound-157, Bepecin
A gastric pentadecapeptide studied extensively in animal models for tissue healing, gut protection, and cytoprotective properties. Despite over 100 preclinical studies, human clinical data remains extremely limited.
SemaglutideOzempic, Wegovy
An FDA-approved GLP-1 receptor agonist used for type 2 diabetes and chronic weight management.
TirzepatideMounjaro, Zepbound
An FDA-approved dual GIP/GLP-1 receptor agonist that has shown the highest weight loss results of any approved medication.
TB-500Thymosin Beta-4, TB4
A naturally occurring peptide central to cell migration and tissue repair. Phase 2 human wound healing trials showed accelerated healing; also studied for cardiac and corneal repair.
RetatrutideLY3437943, Triple Agonist
A triple-acting GIP/GLP-1/glucagon receptor agonist in Phase 3 trials showing potentially the highest weight loss of any drug in development.
Thymosin Alpha-1Tα1, Thymalfasin
A naturally occurring thymic peptide approved internationally for immune modulation, with extensive clinical data in hepatitis and cancer immunotherapy.
Latest research & news
All articlesMedicare GLP-1 Bridge: $50/Month Weight Loss Drugs Starting July 2026
CMS announced the Medicare GLP-1 Bridge — a demonstration program offering eligible Medicare beneficiaries access to FDA-approved weight loss drugs for $50 per month starting July 1, 2026. Here is everything you need to know.
7 min readNewsFDA Proposes Permanent Ban on Compounded Semaglutide and Tirzepatide
On April 30, 2026, the FDA proposed permanently excluding semaglutide, tirzepatide, and liraglutide from the 503B bulks list, effectively ending large-scale compounding of GLP-1 drugs. Comments are due June 29.
7 min readNewsInside the FDA Peptide Advisory Committee: What to Expect at the July 23–24 PCAC Meeting
The FDA’s Pharmacy Compounding Advisory Committee meets July 23–24 to vote on whether BPC-157, TB-500, Semax, Epitalon, MOTS-c, KPV, and DSIP should return to the compounding list. With 6 of 10 seats vacant and allegations of committee stacking, the outcome could reshape peptide access.
8 min readNewsFoundayo (Orforglipron) FDA Approved: The First GLP-1 Pill You Can Take Any Time of Day
On April 1, 2026, the FDA approved Foundayo (orforglipron) — Eli Lilly's once-daily oral GLP-1 receptor agonist for weight loss. Unlike existing oral semaglutide, Foundayo can be taken any time of day without food or water restrictions, starting at $149/month.
10 min readNewsFDA Removes 12 Peptides from Category 2: BPC-157, TB-500, Semax, and More No Longer Flagged as Safety Risks
On April 15, 2026, the FDA announced the removal of 12 peptide bulk drug substances from Category 2 — the list reserved for compounds with significant safety concerns. BPC-157, TB-500, Semax, MOTS-c, GHK-Cu (injectable), and seven others are affected. Here is what it means.
9 min readResearchStanford Discovers "Natural Ozempic" Peptide That Cuts Appetite 50% Without GI Side Effects
Stanford researchers used an AI tool called Peptide Predictor to scan all 20,000 human protein-coding genes and discovered BRP — a naturally occurring 12-amino-acid peptide that reduced food intake by 50% in mice and minipigs without the GI side effects of semaglutide. The study was published in Nature.
9 min readResearchSemaglutide Fails Alzheimer's Trial: What the EVOKE Results Mean for GLP-1 Brain Claims
The largest clinical trial of semaglutide for Alzheimer's disease — the EVOKE program, enrolling 3,808 patients across 566 sites in 40 countries — failed to slow cognitive decline. But the biomarker data tells a more nuanced story, and the Parkinson's evidence remains stronger.
10 min readDeep DiveTirzepatide for Weight Loss: What the Clinical Trials Actually Show
Tirzepatide delivered 20.2% body weight reduction in the SURMOUNT-5 head-to-head trial against semaglutide — the largest weight loss ever recorded for a GLP-1 class drug. This guide covers every major trial, the dosing escalation schedule, side effects, cost, and who should consider it.
13 min readDeep DivePeptides for Women: Safety, Benefits, and What’s Different
Women metabolize peptides differently than men — hormonal cycles, body composition, and reproductive considerations all matter. This guide covers what the research actually shows about peptides in women, from GLP-1 agonists and fertility to PT-141 and growth hormone secretagogues.
14 min readPopular guides
View allWhat Are Peptides? A Science-Based Introduction
12 min readCategory GuidesPeptides for Weight Loss: What the Research Shows
15 min readRegulatoryFDA Regulation of Peptides: What You Need to Know
10 min readMethodologyUnderstanding Our Evidence Ratings
6 min readCategory GuidesGrowth Hormone Secretagogues Explained
15 min readCategory GuidesGLP-1 Receptor Agonists: From Semaglutide to Retatrutide
18 min readPracticalHow to Reconstitute Peptides: Step-by-Step
8 min readPracticalPeptide Storage & Handling Best Practices
7 min readMethodologyHow to Read Peptide Research Papers
14 min readFundamentalsPeptide Therapy: What You Need to Know Before Starting
14 min readCategory GuidesPeptides for Muscle Growth: What the Research Actually Shows
12 min readFundamentalsAre Peptides Safe? What the Evidence Shows
11 min readAdministrationPeptide Injection Sites: Subcutaneous vs Intramuscular Guide
9 min readPharmacologyPeptide Half-Life Reference: Dosing Frequency & Duration
8 min readAdministrationPeptide Needle & Syringe Guide: Gauge, Length, and Sizing
7 min readAdministrationPeptide Dosing Timing: When to Inject and Why It Matters
9 min readEducational deep dives
View allHow to Inject Peptides: A Complete Beginner's Guide to Subcutaneous Injections
BPC-157 Dosage Guide: Published Protocols, Timing, and What the Evidence Actually Shows
NAD+ and MOTS-c: What the Longevity Peptide Research Actually Shows in 2026
GLP-1 Drugs and Addiction: Could Ozempic Treat Substance Use Disorders?
Do Peptides Build Muscle? What the Science Actually Says in 2026
Are Injectable Peptides Safe for Anti-Aging? What the Evidence Actually Shows in 2026
Tirzepatide for Weight Loss: What the Clinical Trials Actually Show
Peptides for Women: Safety, Benefits, and What’s Different
How AI Is Revolutionizing Peptide Drug Discovery in 2026
CagriSema Explained: Why Novo Nordisk Is Combining Semaglutide With Amylin
Browse by category
Healing & Recovery
Peptides researched for tissue repair, wound healing, and injury recovery
Weight Loss
GLP-1 receptor agonists and other peptides studied for weight management
Growth Hormone
Growth hormone secretagogues and releasing peptides
Nootropic & Cognitive
Peptides studied for cognitive enhancement and neuroprotection
Sexual Health
Peptides researched for sexual dysfunction and related conditions
Longevity & Anti-Aging
Peptides studied for cellular health and aging-related processes
Skin & Hair
Peptides researched for dermatological applications
Immune Support
Peptides studied for immune system modulation
Gut Health
Peptides researched for gastrointestinal healing and function
Metabolic
Peptides studied for metabolic function and mitochondrial health
The Peptide Brief
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What is peptide research and why does it matter?
Peptides are short chains of amino acids — typically between 2 and 50 — that serve as signaling molecules throughout the human body. Unlike larger proteins, peptides can cross cell membranes and interact with specific receptors, making them promising candidates for therapeutic research. Over the past decade, peptide-based drugs have moved from the laboratory into mainstream medicine, with FDA-approved compounds like semaglutide (Ozempic, Wegovy), tirzepatide (Mounjaro, Zepbound), and bremelanotide (Vyleesi) demonstrating the clinical potential of this drug class.
At PeptideMark, we track and analyze the published scientific evidence for over 20 peptide compounds, from GLP-1 receptor agonists used in weight management to research peptides like BPC-157 and TB-500 that are studied for tissue repair. Our compound guides include clinical trial data, mechanism-of-action breakdowns, safety profiles, and current regulatory status — all rated with our four-tier evidence system that distinguishes strong human trial data from preliminary animal research.
Whether you are a clinician evaluating peptide therapies, a researcher following the latest clinical trials, or someone trying to understand the science behind compounds you have read about, PeptideMark provides the objective, citation-backed information you need to make informed decisions. We accept no vendor funding and maintain complete editorial independence.
Frequently Asked Questions
What are peptides?
Peptides are short chains of amino acids (typically 2–50) that function as signaling molecules in the body. Therapeutic peptides include FDA-approved drugs like semaglutide and tirzepatide, as well as research compounds with varying evidence profiles.
Are peptides legal in the United States?
It depends on the compound. FDA-approved peptides like Ozempic, Wegovy, Mounjoor, and Vyleesi are fully legal with prescription. Others — BPC-157, CJC-1295, Ipamorelin, Thymosin Alpha-1 — were placed on the FDA 503A Do Not Compound list in 2023, eliminating the compounding pathway. Research-chemical purchases exist in a gray zone.
Which peptides have the strongest evidence?
GLP-1 agonists (semaglutide, tirzepatide) have the strongest evidence of any peptide class, with large Phase 3 trials demonstrating weight loss, glycemic control, and cardiovascular benefit. Tesamorelin and PT-141 are FDA-approved for specific indications. Research peptides like BPC-157 have extensive preclinical data but limited human trials.
How does PeptideMark rate evidence?
We use a transparent evidence-rating framework based on trial quality, sample size, regulatory status, and replication. Every claim on the site is cited to primary sources, and ratings distinguish FDA-approved therapies from preclinical-only research compounds.
Is PeptideMark independent?
Yes. PeptideMark accepts no peptide vendor sponsorship and does not sell or recommend specific suppliers. All content is independently researched and reviewed.
Why PeptideMark
Every claim is cited
PubMed IDs, named studies, FDA documents. If we can't cite it, we don't print it.
Evidence is rated honestly
Our 4-tier system distinguishes human RCTs from animal studies. No conflation, no cherry-picking.
Updated continuously
Weekly PubMed and FDA monitoring. Every compound page shows its last review date.