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Peptide Database

Goals
Fat LossMuscle BuildingInjury HealingAnti-AgingCognitive EnhancementSleep OptimizationImmune SupportGut HealingSkin RejuvenationSexual Health
Peptides
5-Amino-1MQ
Weight Management
Abarelix
Hormone Support
Acetyl Hexapeptide-3 (Argireline)
Cosmetic
Adipotide
Weight Management
Adrenomedullin
Healing & Recovery
Alexamorelin
Growth Hormone
Angiotensin (1-7)
Healing & Recovery
AOD-9604
Weight Management
Apelin-13
Healing & Recovery
ARA-290 (Cibinetide)
Healing & Recovery
Bestatin (Ubenimex)
Immune
BPC-157
Healing & Recovery
Buserelin
Hormone Support
Cagrilintide
Weight Management
CagriSema
Weight Management
Capromorelin
Growth Hormone
Cartalax
Anti-Aging
Cathelicidin (hCAP-18 / Synthetic Derivatives)
Immune
Cerebrolysin
Cognitive
Cerluten
Cognitive
Cetrorelix
Hormone Support
Chonluten
Immune
CJC-1295 (No DAC)
Growth Hormone
CJC-1295 with DAC
Growth Hormone
Cortexin
Cognitive
Crystagen
Immune
Daptomycin
Immune
Defensin (HBD-2)
Immune
Defensin (HBD-3)
Immune
Degarelix
Hormone Support
Dihexa
Cognitive
DSIP (Delta Sleep-Inducing Peptide)
Sleep & Recovery
Dulaglutide
Weight Management
Enalapril
Healing & Recovery
Epithalon
Anti-Aging
Exenatide
Weight Management
Fertirelin
Hormone Support
FOXO4-DRI
Anti-Aging
Ganirelix
Hormone Support
GHK-Cu (Copper Peptide)
Cosmetic
GHRH (1-29)
Growth Hormone
GHRP-2
Growth Hormone
GHRP-6 (Growth Hormone Releasing Peptide-6)
Growth Hormone
Glutathione
Anti-Aging
Gonadorelin (GnRH)
Hormone Support
Gramicidin
Immune
Hexarelin
Growth Hormone
Human Chorionic Gonadotropin (HCG)
Hormone Support
Human Growth Hormone (HGH)
Growth Hormone
IGF-1 LR3
Growth Hormone
Immunoxel (Dzherelo)
Immune
Imunofan
Immune
Intermedin (Adrenomedullin-2)
Healing & Recovery
Ipamorelin
Growth Hormone
Kisspeptin-10
Sexual Health
KPV (Alpha-MSH Fragment)
Healing & Recovery
Lactoferricin B
Immune
Larazotide
Healing & Recovery
Lentinan
Immune
Leuphasyl
Cosmetic
Leuprolide
Hormone Support
Liraglutide
Weight Management
Livagen
Anti-Aging
Lixisenatide
Weight Management
LL-37
Immune
Macimorelin
Growth Hormone
Magainin-2
Immune
Mazdutide
Weight Management
Melanotan-2
Cosmetic
MK-677 (Ibutamoren)
Growth Hormone
MOTS-c
Metabolic
Myristoyl Pentapeptide-17
Cosmetic
N-Acetyl Selank
Cognitive
N-Acetyl Semax Amidate
Cognitive
NAD+
Mitochondrial
Nafarelin
Hormone Support
Natriuretic Peptide (ANP)
Healing & Recovery
Nesiritide (BNP)
Healing & Recovery
Nisin
Immune
Noopept (Omberacetam)
Cognitive
Orforglipron
Weight Management
Ovagen
Anti-Aging
Oxytocin Acetate
Hormone Support
P21 (P021)
Cognitive
PACAP-38
Healing & Recovery
Palmitoyl Oligopeptide
Cosmetic
Palmitoyl Pentapeptide-4 (Matrixyl)
Cosmetic
Palmitoyl Tetrapeptide-7
Cosmetic
Palmitoyl Tripeptide-1
Cosmetic
Pancragen
Metabolic
PEG-MGF
Healing & Recovery
Pemvidutide
Weight Management
Pentadecapeptide (BPC Analog)
Healing & Recovery
Pidotimod
Immune
Pinealon
Cognitive
PNC-27
Immune
Polymyxin B
Immune
Pralmorelin (GHRP-2)
Growth Hormone
Pramlintide
Weight Management
Prostamax
Hormone Support
PT-141 (Bremelanotide)
Sexual Health
Relaxin-2 (Serelaxin)
Healing & Recovery
Retatrutide
Weight Management
Selank
Cognitive
Semaglutide
Weight Management
Semax
Cognitive
Sermorelin
Growth Hormone
Setmelanotide
Weight Management
SLU-PP-332
Metabolic
SM-130686
Growth Hormone
Snap-8
Cosmetic
SS-31 (Elamipretide)
Mitochondrial
Substance P Antagonists
Healing & Recovery
Survodutide
Weight Management
SYN-AKE
Cosmetic
Tabimorelin
Growth Hormone
TB-500
Healing & Recovery
Tesamorelin
Growth Hormone
Testagen
Hormone Support
Thymalin
Immune
Thymopentin (TP-5)
Immune
Thymopoietin
Immune
Thymosin Alpha-1
Immune
Thymosin Beta-4
Healing & Recovery
Thymulin (FTS)
Immune
Thymulin Analog (PAT)
Healing & Recovery
Tirzepatide
Weight Management
Tripeptide-29
Cosmetic
Triptorelin
Hormone Support
Ularitide
Healing & Recovery
Urocortin
Healing & Recovery
Ventfort
Anti-Aging
Vesilute
Hormone Support
Vilon
Immune
VIP (Vasoactive Intestinal Peptide)
Healing & Recovery
Xenin-25
Metabolic
Ziconotide (Prialt)
Healing & Recovery
Total Peptides: 137
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Condition Spotlight

Chronic Infections &
Immunodeficiency

When your immune system isn't firing on all cylinders, everything becomes harder. Recurring infections drain your energy, damage your organs, and can be life-threatening. This is where targeted peptide therapy steps in - not to replace your immune system, but to unlock its full potential.

Written by Michael Carroll — Owner, Director of Research · Reviewed by the Peptide Initiative Research Team · Editorial standards

The Problem

Your Immune System Has
a Broken Amplifier

Recurring Infections

Can't seem to shake infections or they keep coming back

Impaired Immune Response

Your body struggles to mount effective defense

Serious Complications

Infections that would be minor become life-threatening

Understanding Immune Dysfunction

When Your Body's Defense System Isn't Enough

Your immune system is supposed to be like a well-trained security force - detecting threats, alerting the right response team, and neutralizing intruders before they cause serious damage. But when you have chronic immunodeficiency (from cancer treatment, aging, autoimmune conditions, or other causes), that security system gets undermanned. The thymus gland, which produces T cells (your immune system's special ops force), shrinks with age and doesn't recover well from illness or treatment. Your body struggles to produce antimicrobial peptides - natural antibiotics that patrol your body surfaces. Your white blood cells get tired and less effective. The result? Bacteria, viruses, and fungi that your body would normally crush just walk right in.

"Your immune system isn't weak - it's understaffed and undersupplied."

This is where peptide therapy becomes a game-changer. Thymosin Alpha-1 actually signals your thymus to wake up and produce more T cells. LL-37 and other antimicrobial peptides literally kill pathogens on contact. Together, they amplify your immune response back to what it should be.

The Solutions

3 Peptides
3 Angles of Attack

1970s (thymus extract isolation)

Thymosin Alpha-1

The Immune System Amplifier

A naturally occurring peptide that signals your thymus to produce more T cells and enhances overall immune function. Approved in 35+ countries for immune enhancement.

Role

Calling in reinforcements to strengthen your defense force

1995

LL-37 (Cathelicidin)

The Antimicrobial Warrior

A naturally occurring antimicrobial peptide that directly kills bacteria, fungi, and some viruses on contact. Part of your innate immune defense.

Role

Sending in foot soldiers to fight on the front lines

1980s (formulation development)

Thymalfasin (Thymosin Alpha-1 Variant)

The Enhanced Immune Modulator

A variant of thymosin alpha-1 with enhanced properties for immune stimulation. Often considered a improved formulation of the original peptide.

Role

An upgraded version of the immune amplifier with stronger signal

Learn more

The Strategy

How They Work Together
Together

PeptidePrimary RoleAnalogy
Thymosin Alpha-1

The Immune System Amplifier

Calling in reinforcements to strengthen your defense force

LL-37 (Cathelicidin)

The Antimicrobial Warrior

Sending in foot soldiers to fight on the front lines

Thymalfasin (Thymosin Alpha-1 Variant)

The Enhanced Immune Modulator

An upgraded version of the immune amplifier with stronger signal

3 Angles of Attack

T Cell Amplification

Thymosin Alpha-1 and Thymalfasin signal the thymus to produce an army of T cells

Direct Antimicrobial Action

LL-37 kills pathogens directly before they can establish infection

Immune Coordination

Together they improve communication between different immune cell types

Synergistic Effect

Combined approach addresses immune restoration, pathogen killing, and response coordination simultaneously

Important Considerations

Reality Check
What to Keep in Mind

Not a Replacement for Medical Care

Peptide therapy enhances immunity but doesn't replace treatment of underlying conditions. Work with your oncologist, immunologist, or infectious disease specialist.

Results Vary Significantly

Response depends on cause of immunodeficiency, age, overall health, and other factors. Some see dramatic improvement, others more gradual.

Lab Monitoring Recommended

Track T cell counts, immune panels, and other markers to ensure peptide therapy is working. Adjust dosing based on response.

This information is for educational purposes only and should not be considered medical advice. Always consult with a qualified healthcare provider before starting any new treatment.

Realistic Expectations

What to Expect: A Realistic Timeline

An honest breakdown based on research and clinical reports.

What's Happening Inside

The peptides are being recognized by your immune system and beginning to exert their effects. T cell production has been signaled to increase. Antimicrobial peptide levels are rising.

What You Might Notice

  • Possibly no obvious changes yet - that's normal
  • Some people report slight increase in energy
  • May notice mild flu-like symptoms as immune system ramps up
  • Some report improved sleep

Watch For

A brief immune activation response is common - feeling slightly feverish or achy for a day or two. This indicates immune system is waking up.

Realistic Expectations

You're laying the foundation for immune recovery. Don't expect immediate infection prevention yet.

Administration Guide

Dosing Protocols & Timing

General guidelines based on research literature and clinical reports. Work with a healthcare provider experienced in peptide therapy to customize for your situation.

Important: These are general guidelines. Don't self-prescribe based on internet articles. Work with a qualified healthcare provider.

Thymosin Alpha-1

1.6-1.6 mg twice weekly

Common Protocols

  • Standard: 1.6 mg subcutaneous injection, twice weekly (e.g., Monday and Thursday)
  • Higher dose: 3.2 mg twice weekly for more severe immunodeficiency
  • Maintenance: 1.6 mg once or twice weekly after initial phase

Timing Considerations

  • Can be administered any time of day
  • Morning dosing preferred by many practitioners
  • Consistency matters more than exact timing
  • Many clinicians combine with other SLE treatments

Cycling

Often used continuously for chronic autoimmune conditions, with periodic reassessment. Some use 3 months on, 1 month off.

Beyond Peptides

Lifestyle Strategies for Living Well

Peptides work best as part of a comprehensive approach. Click each category to explore evidence-based strategies.

At a Glance

Quick Reference Card

Peptide Overview

PeptideWhat It DoesTypical DoseTiming
Thymosin Alpha-1
The Immune System Amplifier1.6-1.6 mg twice weeklyCan be administered any time of day
LL-37 (Cathelicidin)
The Antimicrobial Warrior0.1-1 mg topical or systemicEssential in early stages and if signs of infection emerge
Thymalfasin (Thymosin Alpha-1 Variant)
The Enhanced Immune Modulator1.6-3.2 mg per injectionMorning dosing is typical

Early Wins to Watch

  • Improved recovery from minor infections
  • Better wound healing
  • Increased energy and resilience
  • Fewer infection symptoms

Support Stack

Vitamin DZincSeleniumVitamin CVitamin AB vitaminsProbioticsIron (if deficient)

Lifestyle Priorities

  • Consistent sleep schedule
  • Protein-rich nutrition
  • Infection prevention measures
  • Stress management
  • Safe food handling

Chronic infections and immunodeficiency can feel isolating and terrifying. Peptide therapy - particularly thymosin alpha-1, which is approved in 35+ countries and used in cancer centers worldwide - represents a real, evidence-based approach to restoring immune function. This isn't theoretical - it's actively used in clinical practice with measurable results.

Your immune system is remarkably capable of recovery when given the right signals and support. Keep working with qualified practitioners, monitor your progress, and remember that immune recovery, like all healing, takes time.