The Protocol Library

170+ guides, protocols, and tools to master peptides. Evidence-based, regularly updated, and completely free — no signup required.

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Peptides for Anxiety: Selank & the Evidence

What does the research say about peptides for anxiety? A grounded look at Selank, its GABA mechanism, the human and animal evidence, dosing context, safety, and 2026 FDA status.

12 min

Protocol

Free

Nootropic Peptides for Brain Fog and Focus: What the Research Shows (2026)

Nootropic peptides like Semax, Selank, and Dihexa are studied for focus and cognition. See the evidence, mechanisms, dosing context, and 2026 FDA status.

13 min

Guide

Free

Peptides for Women: A Hormonal-Health Overview

An educational overview of peptides studied in women's hormonal health, including PT-141 (the FDA-approved Vyleesi), GH-axis peptides, evidence levels, safety, and 2026 legal status.

10 min

Guide

Free

GLP-1 for PCOS: Cycle-Regulation Evidence

GLP-1 receptor agonists like semaglutide and liraglutide may improve menstrual regularity in PCOS. Here is what randomized trials actually show in 2026.

12 min

Protocol

Free

Peptides for Perimenopause & Menopause: What the Research Actually Shows

Peptides for perimenopause: what research shows about GH secretagogues, kisspeptin, and PT-141 for menopause symptoms — plus 2026 FDA status. Educational only.

12 min

Guide

Free

CJC-1295 vs Ipamorelin: Which & Why (2026)

CJC-1295 vs ipamorelin compared: mechanism, half-life, dosing parameters, side effects, stacking, and 2026 FDA status. Educational, citation-backed, not medical advice.

17 min

Protocol

Free

Sermorelin vs Ipamorelin: Complete Head-to-Head (2026)

Sermorelin vs ipamorelin compared: mechanism, research dosing, half-life, side effects, and 2026 FDA compounding status for these two GH peptides.

20 min

Protocol

Free

CJC-1295 vs Tesamorelin: Complete Head-to-Head (2026)

CJC-1295 vs tesamorelin compared: mechanism, dosing in research, half-life, FDA status, and safety. Tesamorelin is FDA-approved; CJC-1295 is not. Educational only.

15 min

Protocol

Free

Semax vs Selank: Nootropic Peptide Comparison (2026)

Semax vs Selank compared: mechanisms (BDNF vs GABA/anxiolytic), research-cited dosing, half-life, safety, cost, and 2026 FDA status. Educational, evidence-based.

17 min

Guide

Free

Epitalon vs Other Longevity Peptides: Complete Head-to-Head (2026)

Epitalon vs other peptides: how the pineal tetrapeptide compares to FOXO4-DRI, MOTS-c, GHK-Cu, Humanin & Thymalin on mechanism, evidence, safety and 2026 FDA status.

17 min

Protocol

Free

MK-677 vs CJC-1295/Ipamorelin: Comparing GH Approaches (2026)

MK-677 vs CJC-1295/Ipamorelin compared: mechanism, half-life, dosing in research, side effects, cost, and 2026 FDA/WADA status. Educational, evidence-based.

17 min

Protocol

Free

Where to Buy Peptides Legally (National 2026 Guide)

Where to buy peptides legally in 2026: the only lawful path is a prescription via a 503A/503B pharmacy. How the FDA's 2026 reclassification and RUO labels work.

13 min

Guide

Free

Chinese Peptides Quality: Grey-Market Red Flags to Watch For

How to spot quality red flags in Chinese and grey-market peptides: third-party testing gaps, fake COAs, endotoxin and dosing risks, plus 2026 FDA status.

13 min

Guide

Free

Peptide Purity Testing: How to Verify Purity From a COA (2026)

Learn how to read a peptide Certificate of Analysis (COA): HPLC purity, mass-spec identity, endotoxin testing, and what a 99% purity claim does and doesn't mean.

12 min

Guide

Free

Peptide Dosing Mistakes: mg vs mcg, Titration, and Reconstitution Errors

The most common peptide dosing mistakes — mg vs mcg confusion, reconstitution math, and skipping titration — explained for educational purposes. Not medical advice.

13 min

Guide

Free

Peptide Contraindications: Who Should NOT Use Peptides

Peptide contraindications explained: pregnancy, active cancer, MTC/MEN 2, and more. Who should avoid peptides and why, with primary FDA and clinical sources.

13 min

Guide

Free

How Long Does TB-500 Take to Work?

How long does TB-500 take to work? Animal studies show tissue changes within days, but human timelines vary. See the evidence, dosing context, and FDA status.

11 min

Protocol

Free

Peptide Therapy vs HRT: Complete Head-to-Head (2026)

Peptide therapy vs HRT compared: mechanisms, evidence, costs, side effects, and 2026 FDA status. Educational guide to growth-hormone peptides and hormone replacement.

17 min

Guide

Free

Tirzepatide Cost 2026: Brand vs Compounded vs Telehealth

Tirzepatide cost in 2026: Zepbound KwikPen self-pay runs $299–$699/month by dose, plus Mounjaro's published WAC, compounded limits, and the 2026 FDA rules.

11 min

Guide

Free

How Much Does Semaglutide Cost Per Month?

Semaglutide costs roughly $1,000–$1,350/month at list price in 2026, but self-pay and insured prices run far lower. See current Ozempic, Wegovy, and compounded pricing.

8 min

Guide

Free

Tirzepatide vs Semaglutide Weight Loss: Complete Head-to-Head (2026)

Tirzepatide vs semaglutide weight loss: in head-to-head SURMOUNT-5, tirzepatide cut weight 20.2% vs 13.7%. Mechanism, side effects, cost, 2026 legality.

18 min

Guide

Free

GHK-Cu Benefits & Evidence: What the Research Actually Shows (2026)

GHK-Cu benefits explained: collagen, skin repair, and antioxidant effects from peer-reviewed research, plus dosing context, safety, and 2026 FDA status.

13 min

Guide

Free

Thymosin Alpha-1 Benefits: What the Immune Research Actually Shows

Thymosin alpha-1 is a thymic immune-modulating peptide. Here is what human and lab research shows about its immune benefits, dosing context, safety, and 2026 FDA status.

12 min

Guide

Free

Peptide Therapy Cost: National Breakdown (2026)

What does peptide therapy cost in 2026? Which peptides have a published price and which do not, plus consult, lab and supply fees, and the FDA's 2026 changes.

12 min

Guide

Free

Peptide Therapy Side Effects: A Cross-Class Safety Guide (2026)

Peptide therapy side effects vary by class. Compare GLP-1, growth-hormone, healing, and melanocortin peptides — what research reports, and what to ask a provider.

13 min

Guide

Free

Peptides for Muscle Growth: An Athlete's Evidence Guide (2026)

Peptides for muscle growth explained: how GH-secretagogue peptides like CJC-1295, ipamorelin and tesamorelin work, what the human evidence shows, dosing context, safety, and 2026 FDA status.

12 min

Protocol

Free

Best Peptides for Fat Loss (2026): What the Research Actually Shows

Which peptides are studied for fat loss in 2026? An evidence-based, educational look at GLP-1 incretins, GH-axis peptides, and AOD-9604, with dosing context and FDA status.

13 min

Protocol

Free

Best Peptides for Anti-Aging (2026): An Evidence-Based Guide

An evidence-based 2026 guide to anti-aging peptides — GHK-Cu, epitalon, FOXO4-DRI, sermorelin and more. What the research shows, dosing context, safety, and FDA status.

14 min

Protocol

Free

Best Peptides for Recovery & Healing (2026)

An evidence-based 2026 guide to peptides for recovery — BPC-157, TB-500, GHK-Cu — covering mechanism, research dosing, safety, and current FDA status.

14 min

Protocol

Free

Best Peptides for Sleep (2026): What the Research Actually Shows

The peptides most studied for sleep — DSIP, epitalon, and GH-axis peptides — explained. Mechanisms, research-cited dosing, safety, and 2026 FDA status.

14 min

Protocol

Free

Best Peptides for Women (2026): An Evidence-Based Guide

An evidence-based 2026 guide to the most-researched peptides relevant to women — PT-141, GHK-Cu, collagen peptides, BPC-157 and GH secretagogues — plus FDA status and safety.

14 min

Guide

Free

Peptides vs Steroids for Muscle: Safety & Legality (2026)

Peptides vs steroids for muscle: how they differ in mechanism, evidence, side effects, and legality. Steroids are proven but Schedule III; muscle peptides are unproven and unapproved.

18 min

Guide

Free

BPC-157 vs PRP: Complete Head-to-Head (2026)

BPC-157 vs PRP compared: mechanism, evidence, cost, safety, and 2026 FDA status. BPC-157 is a research peptide with animal data; PRP is a clinic procedure with mixed human trials.

16 min

Guide

Free

Sleep Peptides vs Melatonin vs Rx Sleep Aids: Complete Head-to-Head (2026)

Sleep peptides (DSIP, Epitalon) vs melatonin vs prescription sleep aids: how each works, the evidence, dosing, safety, cost, and 2026 FDA status compared.

16 min

Guide

Free

GHK-Cu Topical vs Injectable: Does Topical Work? (2026)

GHK-Cu topical vs injectable, compared: skin penetration data, delivery routes, dosing parameters, safety, and 2026 FDA status. Educational, evidence-based.

17 min

Protocol

Free

GHK-Cu vs Retinol for Skin Aging: Complete Head-to-Head (2026)

GHK-Cu vs retinol for skin aging: how each works, what the clinical evidence shows on wrinkles and collagen, side effects, cost, FDA status, and how they stack.

19 min

Guide

Free

Compounded Semaglutide Cost vs Brand GLP-1: 2026 Price Breakdown

Compounded semaglutide cost vs brand Wegovy, Ozempic, and Zepbound in 2026 — full price breakdown, plus what the FDA's compounding rules now allow.

11 min

Guide

Free

Managing GLP-1 Nausea & Side Effects: What the Evidence Shows

Semaglutide side effects explained: why GLP-1 nausea happens, how common it is in trials, and evidence-based ways to manage it. Educational, not medical advice.

11 min

Guide

Free

Tesamorelin for Visceral Fat: Body Composition Effects Explained

Tesamorelin is an FDA-approved GHRH analog studied for visceral fat reduction in HIV lipodystrophy. Explore the evidence, body-composition data, dosing, and safety.

11 min

Protocol

Free

AOD-9604 vs GLP-1: Is It as Good for Weight Loss? (2026 Reality Check)

AOD-9604 vs GLP-1 drugs for weight loss: what the human trials actually show, the mechanism gap, FDA status, and an honest reality check. Educational only.

18 min

Guide