Learn About Peptides
Evidence-based guides on peptide science, stacking protocols, legality, sourcing, and more. Written and reviewed by clinical pharmacists.
Peptide Science
Peptides: The Complete Evidence-Based Guide
The definitive guide to peptides — what they are, how they work, every major type, benefits, safety, and legality. Pharmacist-reviewed and evidence-based.
What Are Peptides? Complete Beginner's Guide
Learn what peptides are, how they work as cellular messengers, the different types, benefits, administration methods, safety considerations, and regulatory status.
Peptide Stacking Guide
Peptide stacking combines two or more peptides in coordinated protocols to achieve synergistic effects for muscle growth, fat loss, recovery, and cognitive enhancement. Learn the most effective stacks, dosing strategies, safety protocols, and monitoring guidelines.
Peptide Cycling
Learn when and why to cycle peptides. Understand cycling protocols for growth hormone secretagogues, healing peptides, and metabolic peptides to optimize results and avoid tolerance.
How to Safely Source Peptides: Avoiding Scams and Poor Quality
Learn how to safely source research peptides by verifying Certificates of Analysis, recognizing red flags, understanding purity metrics, and ensuring proper storage. A complete guide to avoiding scams and low-quality suppliers.
Peptide Legality: FDA Status, Research Use, and What's Legal
Peptides are legally classified based on FDA approval status, compounding rules, and intended use, not molecular structure. Learn what's legal, what's restricted, and what the gray areas mean for you.
Peptide Purity Testing
Learn how to verify peptide purity using HPLC, mass spectrometry, and third-party lab testing. Understand Certificates of Analysis, common impurities, and what purity standards to look for.
Peptide Certificates of Analysis
Learn how to read and verify a peptide Certificate of Analysis (COA). Covers purity testing, mass spectrometry, contaminant screening, red flags, and verification strategies for research peptides.
Peptides and Drug Testing: What Shows Up and How Long
This guide covers how peptides interact with drug testing, detection windows for various peptide types, WADA prohibition status, and factors affecting detectability.
Traveling with Peptides
Everything you need to know about traveling with peptides, how to store them safely, navigate TSA security, understand legal status by country, and prepare the right documentation.
How to Inject Peptides: Subcutaneous Injection Guide
Learn how to safely inject peptides subcutaneously. Step-by-step guide covering supplies, reconstitution, injection technique, site rotation, storage, and common mistakes to avoid.
Peptide Glossary: A-Z of Peptide Terms
Comprehensive glossary of peptide terminology. From amino acids to reconstitution, understand every term used in peptide research, therapy, and clinical trials.
Best Peptides For...
Weight Loss
Compare the most effective peptides for weight loss and fat loss. Evidence-based rankings of semaglutide, tirzepatide, retatrutide, AOD-9604, and more.
Recovery
Compare the best peptides for injury recovery, tissue repair, and healing. Evidence-based rankings of BPC-157, TB-500, GHK-Cu, and more with dosage protocols.
Muscle Growth
Compare the best peptides for muscle growth, recovery, and body composition. Evidence-based rankings of CJC-1295, Ipamorelin, GHRP-6, Sermorelin, and more.
Anti-Aging
Compare the best anti-aging peptides for longevity, skin health, cognitive function, and cellular repair. Evidence-based guide to Epithalon, SS-31, GHK-Cu, and more.
Skin Health
Compare the best peptides for skin health, anti-aging, collagen production, and wound healing. Evidence-based guide to GHK-Cu, BPC-157, KPV, and more.
Sleep
Compare the best peptides for sleep quality: Ipamorelin/CJC-1295, Selank, Epithalon. Evidence-based rankings with dosage protocols and mechanism explanations.
Gut Health
Compare the best peptides for gut health: BPC-157, KPV, GHK-Cu. Evidence-based rankings covering IBS, IBD, leaky gut, and intestinal repair with dosage protocols.
Joint Health
Compare the best peptides for joint pain, cartilage repair, and connective tissue health. Evidence-based rankings of BPC-157, TB-500, GHK-Cu, and more.
Cognitive Enhancement
Compare the best nootropic peptides: Semax, Selank, Epithalon, SS-31, BPC-157. Evidence-based rankings with dosage protocols and mechanism explanations for brain optimization.
Hair Growth
Compare the best peptides for hair restoration and growth. Evidence-based rankings of GHK-Cu, Ipamorelin, CJC-1295, BPC-157, and TB-500 with protocols.
Beginners
The complete beginner's guide to peptides. Which to start with, how to inject safely, blood work requirements, sourcing quality, and what to realistically expect.
Sexual Health
Compare the best peptides for sexual function, libido, and arousal. Evidence-based rankings of PT-141, Melanotan II, Kisspeptin-10, and GH peptides with dosage protocols.
Immune Support
Compare the best immune-modulating peptides. Evidence-based rankings of Thymosin Alpha-1, KPV, Selank, and BPC-157 with dosage protocols and clinical data.
Peptide Comparisons
Semaglutide vs Tirzepatide
Semaglutide vs tirzepatide compared: weight loss results, side effects, cost, and mechanisms. Evidence from STEP and SURMOUNT clinical trials.
BPC-157 vs TB-500
BPC-157 vs TB-500 compared head-to-head: mechanisms, dosage, efficacy, side effects, and when to use each. Plus: the Wolverine Stack protocol.
CJC-1295 vs Ipamorelin
CJC-1295 vs Ipamorelin explained: different mechanisms, why they stack so well together, dosing protocols, side effects, and which to choose.
Liraglutide vs Semaglutide
Liraglutide vs semaglutide compared: efficacy, dosing, side effects, cardiovascular data, and cost. SCALE vs STEP trials analyzed. Which GLP-1 agonist is right for you?
Semaglutide vs Retatrutide
Semaglutide vs retatrutide: how the proven GLP-1 agonist compares to the triple-agonist in clinical trials. Weight loss data, mechanisms, and what to expect.
Sermorelin vs CJC-1295
Sermorelin vs CJC-1295: clinical history, half-life, GH elevation, and which GHRH analog fits your protocol. The definitive comparison of the two most used options.
Ipamorelin vs GHRP-6
Ipamorelin vs GHRP-6 head-to-head: clean GH selectivity versus raw potency. Mechanism, dosing, side effects, and which GHRP fits your protocol.
Selank vs Semax
Selank vs Semax compared head-to-head: mechanisms, dosage, effects, and when to use each. Both developed at Russia's Institute of Molecular Genetics.
GHK-Cu vs BPC-157
GHK-Cu vs BPC-157 compared: mechanisms, evidence, dosage, and when to use each. One has human clinical data, the other has broader preclinical reach.
BPC-157 vs KPV
BPC-157 vs KPV for gut health: mechanisms, evidence, dosage, and when to use each. Compare tissue repair vs anti-inflammatory approaches.
PT-141 vs Melanotan II
PT-141 vs Melanotan II compared: mechanisms, safety, side effects, and when to use each. One is FDA-approved, the other carries significant risks.
Tirzepatide vs Retatrutide
Tirzepatide vs retatrutide compared: dual vs triple receptor agonism, weight loss data, side effects, and what the glucagon receptor adds. Evidence-based analysis.
GHRP-2 vs GHRP-6
GHRP-2 vs GHRP-6 compared: GH potency, appetite effects, cortisol elevation, side effects, and dosing protocols. Which GHRP wins for body composition?
AOD-9604 vs Semaglutide
AOD-9604 vs semaglutide compared: mechanisms, clinical evidence, weight loss results, safety, and legal status. A frank look at two very different compounds.
Epithalon vs SS-31
Epithalon vs SS-31 compared: telomerase activation vs mitochondrial cardiolipin protection. Evidence quality, dosing, safety, and which to choose for longevity goals.
Tesamorelin vs Ipamorelin
Tesamorelin vs Ipamorelin compared: FDA-approved GHRH analog vs selective GHRP. Different receptor pathways, Phase 3 trial data, and how to choose for body composition goals.
Thymosin Alpha-1 vs TB-500
Thymosin Alpha-1 vs TB-500 compared: immune modulator approved in 35+ countries vs tissue repair peptide. Mechanisms, dosing, evidence, and when to use each.