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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

Immune
Senescence

Your immune system is aging faster than your body. You catch colds that used to bounce right off. Vaccines barely work. And deep down, chronic inflammation smolders quietly - a fire that never quite goes out.

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

The Problem

Your Immune System Has
Lost Its Training Ground

Increased Infections

Catching more colds, flu, and other infections

Vaccine Ineffectiveness

Vaccines don't generate strong immune responses anymore

Chronic Inflammation

Low-grade inflammaging accelerates aging in all tissues

Understanding Immune Senescence

When Your Immune System Retires Too Early

Your thymus gland is where your immune system trains its warrior cells - the T cells that recognize invaders and tell your body when to fight. It's one of the most critical organs for protecting you from infections. But starting around age 30-40, your thymus begins to shrink and deteriorate - a process called thymic involution. By age 60, it's only a fraction of its original size. The immune cells still get made, but they're less effective, less diverse, and less able to respond to new threats. What's worse, this aging immune system doesn't just fail silently. It starts producing chronic inflammation - inflammaging - where immune cells fire off inflammatory signals even when there's no enemy to fight. This low-grade inflammation is like a fire alarm stuck on 'on.' It accelerates aging in every tissue, increases risk of chronic diseases, and makes you more vulnerable to infections.

"Your immune system is like an experienced army that's lost its training academy and is running out of fresh recruits."

This is where thymic peptides come in. They can't reverse the aging process entirely, but they can restore function to your aging thymus, increase the diversity of immune cells, and reduce the chronic inflammation that's aging your entire body.

The Solutions

4 Peptides
4 Angles of Attack

1970s (thymus extract isolation)

Thymosin Alpha-1

The Immune Trainer

A naturally occurring peptide produced by your thymus gland that trains and activates T cells, your immune system's frontline defense.

Role

A drill sergeant getting new recruits battle-ready

1975

Thymulin

The Immune Orchestrator

A zinc-dependent peptide produced by thymic cells that coordinates immune response and maintains immune system balance.

Role

A conductor synchronizing all the different sections of an orchestra

1987

Epitalon (Epithalamin)

The Longevity Peptide

A pineal gland-derived peptide that regulates circadian rhythms, immune function, and has been studied extensively in Russia for life-extension potential.

Role

A master conductor of your body's time-keeping and aging processes

Learn more

1980s

Thymalin

The Thymic Activator

A thymic extract peptide that directly stimulates thymic function and promotes immune cell development.

Role

A multivitamin specifically formulated for your thymus gland

The Strategy

How They Work Together
Together

PeptidePrimary RoleAnalogy
Thymosin Alpha-1

The Immune Trainer

A drill sergeant getting new recruits battle-ready

Thymulin

The Immune Orchestrator

A conductor synchronizing all the different sections of an orchestra

Epitalon (Epithalamin)

The Longevity Peptide

A master conductor of your body's time-keeping and aging processes

Thymalin

The Thymic Activator

A multivitamin specifically formulated for your thymus gland

4 Angles of Attack

T Cell Training

Thymosin Alpha-1 and Thymalin activate your thymus to produce more T cells

Immune Orchestration

Thymulin keeps immune responses balanced and prevents excessive inflammation

Systemic Regulation

Epitalon works through melatonin to regulate circadian immune function and reduce inflammaging

Synergistic Effect

Together they rebuild thymic function, increase immune diversity, boost vaccine response, and calm chronic inflammation

Important Considerations

Reality Check
What to Keep in Mind

Realistic Expectations

These peptides restore immune function but can't make you immune to everything. You'll get sick less often and recover faster, not become invulnerable.

Research is Expanding

Thymosin Alpha-1 is FDA-approved in the US for certain indications. Epitalon has extensive Russian research. Other peptides have strong supportive data but varying regulatory status by region.

Professional Guidance

Work with a healthcare provider experienced in peptide therapy. Proper dosing, monitoring, and integration with other treatments matter.

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 signaling to your thymus gland to wake up and start producing more immune cells. Most people don't notice much yet - it's work happening at the cellular level.

What You Might Notice

  • Possibly no noticeable changes - and that's completely normal
  • Some people report slightly improved mood (immune signaling affects mood)
  • Very subtle energy shifts in some cases
  • May sleep more deeply as immune system recalibrates

Watch For

Some people experience mild flu-like symptoms as the immune system activates - this is typically a positive sign of engagement.

Realistic Expectations

You're laying the foundation. Most benefits come later.

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

  • Option A: 1.6 mg subcutaneous injection, twice weekly (e.g., Monday and Thursday)
  • Option B: 3.2 mg subcutaneous injection, once weekly
  • Standard: 1.6 mg daily for 4-7 days, then rest days, repeating weekly

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 Trainer1.6-1.6 mg twice weeklyCan be administered any time of day
Thymulin
The Immune Orchestrator2-4 mg per weekMorning administration is preferred
Epitalon (Epithalamin)
The Longevity Peptide5-10 mg per doseEvening administration preferred (works with natural melatonin rhythm)
Thymalin
The Thymic Activator10-20 mg per weekMorning administration is standard

Early Wins to Watch

  • Better sleep quality
  • Fewer colds and infections
  • Faster recovery when sick
  • Improved energy and mood

Support Stack

ZincVitamin D3SeleniumVitamin CMagnesiumProbioticsBeta-glucansQuercetin

Lifestyle Priorities

  • Consistent sleep schedule
  • Morning light exposure
  • Regular moderate exercise
  • Adequate protein intake
  • Stress management
  • Anti-inflammatory nutrition

Age-related immune decline feels inevitable - like watching your body gradually lose the ability to protect itself. But it's not. Your thymus can be reactivated. Your immune diversity can be restored. You can get back the resistance to infections and the vitality you had years ago.

The timeline is measured in months, not weeks. But the improvement is real and compound. Your immune system is remarkably responsive to the right peptide support - give it the tools and it will rebuild.