Dr. Jay's Plain-English Peptide Encyclopedia
Research peptides explained in simple human language. Learn what researchers study, how these compounds work, and what online communities commonly discuss.
What are you researching?
Weight Loss & Metabolism
GLP-1s, amylin analogs, and metabolic research compounds.
Healing & Recovery
Tendon, ligament, gut, and tissue repair research peptides.
Brain & Cognitive Support
Nootropic peptides for focus, memory, and mood research.
Sexual Function & Hormones
Libido, arousal, and reproductive hormone pathways.
Longevity & Healthy Aging
Telomere, senescence, and cellular aging research.
Skin, Hair & Beauty
Collagen, pigmentation, and hair growth research peptides.
Immune System & Inflammation
Thymic peptides and inflammatory modulators.
Muscle Growth & Performance
Growth hormone secretagogues and IGF-1 pathway research.
Sleep & Stress Support
Sleep architecture, anxiolytic, and stress-response peptides.
Heart & Cardiovascular Health
Cardioprotection and vascular research peptides.
Mitochondrial Health & Energy
NAD+, MOTS-c, Humanin, and mitochondrial-derived peptides.
Experimental Research Compounds
Emerging and frontier research peptides.
Alphabetical peptide directory
94 of 94 peptides shown
ACE-031
Soluble activin receptor researched as a myostatin and activin trap to promote lean mass.
ACTH 1-39
Full-length adrenocorticotropic hormone studied for adrenal stimulation and HPA axis research.
Adamax
Russian-developed peptide analog studied for cognition, mood, and stress resilience.
Adipotide
Experimental peptide studied for selective destruction of fat-tissue blood supply.
AHK-Cu
Copper peptide studied specifically for hair follicle stimulation.
AICAR
AMPK activator researched as an exercise mimetic.
AOD9604
Fragment of human growth hormone researched for fat-burning effects without glucose or IGF-1 impact.
ARA-290
11-amino-acid peptide derived from EPO, researched for tissue repair and neuropathy.
Argireline
Topical peptide researched for relaxing expression lines.
B7-33
Single-chain relaxin analog studied for anti-fibrotic and cardioprotective effects.
BPC-157
One of the most discussed research peptides for tendon, ligament, gut, and recovery research.
BPC-157 + TB-500
Combined research protocol pairing localized tissue repair with systemic recovery.
Bronchogen
Khavinson short peptide studied for bronchial and pulmonary tissue research.
Cagrilintide
Long-acting amylin analog studied alongside GLP-1 agonists for added satiety.
Cagrilintide + Semaglutide
Combined amylin analog and GLP-1 research protocol studied for additive weight loss.
Cardiogen
Khavinson short peptide researched for heart tissue regulation.
Cartalax
Khavinson tripeptide studied for cartilage and joint research.
Cerebrolysin
Neurotrophic peptide preparation studied for cognitive support and brain injury recovery.
Chonluten
Khavinson short peptide researched for bronchial epithelium support.
CJC-1295
Modified GHRH analog that amplifies and extends growth hormone pulses.
CJC-1295 DAC
Albumin-binding GHRH analog studied for sustained GH and IGF-1 elevation.
CJC-1295 No DAC + Ipamorelin
Combined GHRH + GHRP research stack designed to amplify natural GH pulses.
Cortagen
Khavinson short peptide studied for cerebral cortex support.
Crystagen
Khavinson short peptide studied for immune system bioregulation.
Dihexa
HGF-mimicking peptide researched for synapse formation and brain repair.
DSIP
Nonapeptide researched for delta-wave sleep promotion.
Dulaglutide
Long-acting GLP-1 receptor agonist studied for glucose control and weight management.
FGL
Neural cell adhesion molecule (NCAM) mimetic studied for synaptic plasticity.
Follistatin
Glycoprotein researched for myostatin inhibition and muscle hypertrophy.
FOXO4-DRI
Designed senolytic peptide studied for clearing senescent cells in aging research.
GHK-Cu
Tripeptide-copper complex studied for collagen synthesis, wound healing, and hair follicle research.
GHRP-2
Classic GHRP studied for reliable, moderate growth hormone release.
GHRP-6
Early-generation ghrelin mimetic researched for GH release and appetite stimulation.
Glow Blend
Research blend combining a copper skin peptide with tissue-repair peptides into one formulation.
Glutathione
Tripeptide antioxidant studied for detoxification, immune, and antioxidant support.
Gonadorelin
Synthetic GnRH researched for pulsatile HPG axis stimulation.
hCG
Hormone that mimics LH at the testes for endogenous testosterone support research.
Hexarelin
Most potent of the classic GHRPs with strong cardioprotection research signals.
HGH 191AA
Recombinant 191-amino-acid human growth hormone — the reference standard.
HGH Fragment 176-191
C-terminal fragment of human growth hormone studied for lipolytic effects without affecting glucose or IGF-1.
HMG
Purified FSH and LH combination researched for gonadal stimulation and fertility.
Humanin
24-amino-acid mitochondrial peptide studied for neuroprotection and longevity.
Kisspeptin
Hypothalamic neuropeptide that triggers downstream reproductive hormone cascades.
KLOW Blend
Compounded research blend combining multiple skin and repair peptides into one formulation.
KPV
Tripeptide fragment of alpha-MSH researched for anti-inflammatory effects.
L-Carnitine
Amino acid derivative researched for fatty-acid transport and mitochondrial energy.
Liraglutide
Daily GLP-1 receptor agonist researched for glucose control and weight loss.
Livagen
Khavinson short peptide researched for liver tissue and chromatin support.
LL-37
Naturally occurring antimicrobial peptide researched for biofilm and chronic infection contexts.
Matrixyl
Topical anti-aging peptide studied for collagen stimulation.
Mazdutide
Dual GLP-1/glucagon receptor agonist researched for obesity and metabolic disease.
Melanotan 1
Selective MC1R agonist researched for skin pigmentation and photoprotection.
Melanotan II
Melanocortin agonist researched for melanogenesis and sexual arousal.
MGF
Splice variant of IGF-1 researched for local muscle repair and satellite cell activation.
MOTS-c
16-amino-acid mitochondrial-derived peptide studied as an exercise mimetic.
Orexin A
Hypothalamic neuropeptide researched for wakefulness, arousal, and appetite.
Orexin B
Hypothalamic neuropeptide preferring OX2R, researched for arousal and metabolism.
Ovagen
Russian Khavinson short-peptide bioregulator studied for liver and immune system support.
Oxytocin
Nine-amino-acid neuropeptide studied for bonding, trust, and social behavior.
P21
Synthetic peptide derived from CNTF researched for neurogenesis.
Palmitoyl Tetrapeptide-20
Lipidated cosmetic peptide studied for skin firmness, tone, and barrier support.
PE-22-28
Spadin-derived peptide researched as a TREK-1 channel blocker for depression models.
PEG-MGF
PEGylated, long-acting form of MGF researched for systemic muscle repair.
PHDP5
Cell-penetrating research peptide studied for Pin1 modulation and neuroprotection.
Pinealon
Khavinson tripeptide researched for neuroprotection and cognitive aging.
PNC-27
Research peptide that selectively disrupts cancer cell membranes in laboratory studies.
Prostamax
Khavinson short peptide studied for prostate tissue support.
PT-141
Melanocortin receptor agonist studied for sexual arousal pathways in both sexes.
PTD-DBM
Cell-permeable peptide that disrupts CXXC5-Dishevelled binding to enhance Wnt/β-catenin signaling for hair follicle research.
Selank
Russian anxiolytic peptide researched for stress reduction without sedation.
Semaglutide
The reference GLP-1 receptor agonist studied heavily for weight loss and glycemic control.
Semax
Russian nootropic peptide researched for BDNF/NGF upregulation and cognitive support.
Sermorelin
First 29 amino acids of GHRH studied for stimulating the body's own GH production.
SLU-PP-332
Small molecule (not a peptide) researched as an ERR-α/β/γ agonist exercise mimetic.
SNAP-8
Extended cosmetic peptide studied as a topical alternative to neurotoxin-style wrinkle reduction.
SS-31
Mitochondria-targeted peptide studied for cardiolipin stabilization.
Survodutide
Dual GLP-1/Glucagon agonist researched for weight and liver outcomes.
TB-500
Systemic recovery research peptide derived from thymosin beta-4.
TB-500 Fragment (17-23)
Short actin-binding fragment of thymosin beta-4 studied as a TB-500 alternative.
Tesamorelin
Stabilized GHRH analog studied for visceral adipose reduction.
Thymalin
Thymic peptide complex studied for immunosenescence and immune restoration.
Thymosin Alpha-1
Defined 28-amino-acid thymic peptide researched for immune modulation.
Tirzepatide
Dual GLP-1 + GIP agonist studied for superior glycemic and weight outcomes vs single-agonists.
Vesilute
Khavinson short peptide researched for urinary bladder tissue support.
Vesugen
Khavinson tripeptide researched for vascular endothelium support.
Vilon
Khavinson dipeptide researched for immune and lymphocyte support.
VIP
Endogenous neuropeptide researched for anti-inflammatory and vasodilatory effects.
Popular peptide comparisons
Side-by-side breakdowns of the comparisons researchers ask about most.
PT-141 vs Oxytocin
Arousal pathway vs bonding pathway.
Semax vs Selank
Focus and cognition vs calm and stress relief.
BPC-157 vs TB-500
Localized soft tissue repair vs systemic recovery.
Semaglutide vs Tirzepatide
Single GLP-1 vs dual GLP-1/GIP agonism.
Tirzepatide vs Retatrutide
Dual vs triple receptor metabolic research.
GHK-Cu vs AHK-Cu
All-around beauty peptide vs hair-focused copper peptide.
MOTS-c vs AICAR
Mitochondrial peptide vs AMPK-activating exercise mimetic.
Ipamorelin vs Sermorelin
Modern selective GHRP vs original GHRH analog.
CJC-1295 vs Tesamorelin
Broad GHRH analog vs visceral-fat-focused analog.
Thymalin vs Thymosin Alpha-1
Thymic complex vs defined immune peptide.
Semaglutide vs Liraglutide
Once-weekly successor vs once-daily original GLP-1.
Semaglutide vs Dulaglutide
Two once-weekly GLP-1 agonists compared.
Semaglutide vs Cagrilintide
GLP-1 incretin vs long-acting amylin analog.
Tirzepatide vs Mazdutide
GLP-1/GIP dual vs GLP-1/glucagon dual.
Tirzepatide vs Survodutide
Two dual-agonist strategies compared.
Retatrutide vs Survodutide
Triple agonist vs GLP-1/glucagon dual.
Retatrutide vs Mazdutide
Triple agonist vs dual GLP-1/glucagon.
Mazdutide vs Survodutide
Two GLP-1/glucagon dual agonists compared.
Liraglutide vs Dulaglutide
Daily vs weekly GLP-1 dosing.
Cagrilintide vs Tirzepatide
Amylin pathway vs incretin pathway.
AOD-9604 vs HGH Fragment 176-191
Modified C-terminal GH fragment vs base 176-191.
5-Amino-1MQ vs MOTS-c
NNMT inhibitor vs mitochondrial-derived peptide.
5-Amino-1MQ vs SLU-PP-332
Fat-targeted NNMT block vs ERR-driven exercise mimetic.
Adipotide vs AOD-9604
Vascular fat-targeting peptide vs GH-derived fragment.
L-Carnitine vs AOD-9604
Fatty-acid shuttle vs GH-derived fat fragment.
CJC-1295 vs CJC-1295 with DAC
Short-acting GHRH analog vs albumin-bound long-acting.
Sermorelin vs Tesamorelin
Original GHRH 1-29 vs stabilized GHRH analog.
Sermorelin vs Ipamorelin
GHRH analog vs selective GHRP.
Ipamorelin vs Hexarelin
Selective GHRP vs strong GHRP with cortisol/prolactin rise.
Ipamorelin vs GHRP-2
Cleaner selective GHRP vs stronger GHRP.
GHRP-2 vs GHRP-6
Pure GH release vs ghrelin/hunger-driving GHRP.
CJC-1295 vs Sermorelin
Modified longer-acting GHRH vs native fragment.
Hexarelin vs GHRP-6
Strongest GHRP for GH vs hunger-driving GHRP.
Tesamorelin vs HGH
GHRH analog vs exogenous recombinant GH.
Sermorelin vs HGH
Stimulating native release vs direct GH delivery.
IGF-1 LR3 vs MGF
Long-acting IGF-1 analog vs muscle splice variant.
MGF vs PEG-MGF
Native short-acting vs pegylated long-acting MGF.
IGF-1 LR3 vs PEG-MGF
Systemic IGF-1 analog vs satellite-cell-focused PEG-MGF.
ACE-031 vs Follistatin-344
Activin receptor decoy vs myostatin-binding protein.
CJC-1295/Ipamorelin Stack vs Sermorelin
Combined GHRH+GHRP synergy vs single GHRH analog.
Hexarelin vs Tesamorelin
Potent GHRP vs visceral-fat-focused GHRH analog.
BPC-157 vs GHK-Cu
Soft-tissue repair vs collagen/copper signaling.
BPC-157 vs KPV
Tissue repair vs targeted anti-inflammatory peptide.
TB-500 vs TB-500 Fragment 17-23
Full thymosin-β4 fragment vs short active stretch.
BPC-157 vs ARA-290
Soft-tissue healing vs nerve tissue protection.
LL-37 vs KPV
Antimicrobial peptide vs anti-inflammatory melanocortin fragment.
BPC-157 vs LL-37
Repair-focused peptide vs antimicrobial cathelicidin.
ARA-290 vs EPO
EPO-derived tissue-protective fragment vs full erythropoietin.
TB-500 vs GHK-Cu
Systemic actin/cell migration vs copper-signaling repair.
Argireline vs Snap-8
Original hexapeptide vs extended octapeptide expression-line research.
Matrixyl vs Argireline
Collagen-stimulating peptide vs expression-line peptide.
GHK-Cu vs Matrixyl
Copper-peptide regeneration vs palmitoyl-conjugated collagen peptide.
PTD-DBM vs AHK-Cu
Wnt pathway hair peptide vs copper-peptide follicle research.
KLOW Blend vs Glow Blend
Tissue-repair-focused blend vs skin-glow-focused blend.
Palmitoyl Tetrapeptide-20 vs Matrixyl
Skin brightening peptide vs collagen-stimulating peptide.
GHK-Cu vs BPC-157
Topical copper signaling vs injectable systemic repair.
PTD-DBM vs GHK-Cu
Wnt-pathway hair peptide vs copper-peptide for follicles and skin.
PT-141 vs Kisspeptin
Central melanocortin arousal vs upstream hormonal cascade.
Oxytocin vs Kisspeptin
Bonding peptide vs master reproductive regulator.
Melanotan 1 vs Melanotan 2
Selective melanocortin agonist vs broader-acting analog.
HCG vs Gonadorelin
LH-mimetic Leydig stimulation vs GnRH-driven HPG axis activation.
HCG vs HMG
LH-like activity vs combined FSH/LH activity.
Gonadorelin vs HMG
Pituitary stimulation vs direct gonadotropin replacement.
PT-141 vs Melanotan 2
Selective MC4 arousal peptide vs broad melanocortin agonist.
Semax vs Dihexa
Russian ACTH analog vs angiotensin-IV–derived synaptogenesis peptide.
Dihexa vs Cerebrolysin
Defined small peptide vs porcine brain polypeptide extract.
Semax vs Cerebrolysin
Heptapeptide nootropic vs brain-derived polypeptide complex.
Selank vs DSIP
Non-sedating anxiolytic vs delta-wave sleep peptide.
P21 vs Dihexa
CNTF-derived neurogenesis peptide vs HGF-amplifying synaptic peptide.
PHDP5 vs Cerebrolysin
Targeted PSD-95 inhibitor vs broad brain extract.
PE-22-28 vs Selank
TREK-1 antidepressant peptide vs anxiolytic heptapeptide.
FGL vs Dihexa
NCAM-mimetic memory peptide vs synaptogenesis peptide.
Semax vs PE-22-28
Stimulating nootropic vs antidepressant-oriented peptide.
Pinealon vs Epitalon
Khavinson neuroprotective tripeptide vs telomerase-activating tetrapeptide.
Vilon vs Thymalin
Khavinson dipeptide vs thymic polypeptide complex.
Vesugen vs Cardiogen
Vascular endothelium peptide vs cardiac tissue peptide.
Epitalon vs Thymalin
Telomerase-activating pineal peptide vs thymic immune restorer.
Livagen vs Prostamax
Khavinson liver peptide vs prostate peptide.
Bronchogen vs Chonluten
Khavinson bronchial peptides compared.
Cartalax vs Cardiogen
Cartilage Khavinson peptide vs cardiac Khavinson peptide.
Ovagen vs Prostamax
Female reproductive Khavinson peptide vs male prostate Khavinson peptide.
Vesilute vs Vesugen
Khavinson lung peptide vs vascular endothelium peptide.
Crystagen vs Thymalin
Khavinson immune peptide vs thymic extract.
Cortagen vs Cerebrolysin
Khavinson brain cortex peptide vs porcine brain extract.
MOTS-c vs Humanin
Two mitochondrial-derived peptides compared.
SS-31 vs MOTS-c
Cardiolipin-binding mitochondrial peptide vs metabolic exercise mimetic.
SS-31 vs Humanin
Mitochondria-protective peptide vs cytoprotective peptide.
NAD+ vs MOTS-c
Coenzyme replenishment vs mitochondrial signaling peptide.
NAD+ vs 5-Amino-1MQ
Direct coenzyme delivery vs NNMT-inhibition for NAD+ preservation.
SLU-PP-332 vs AICAR
ERR-driven exercise mimetic vs AMPK-driven exercise mimetic.
Humanin vs SS-31
Cytoprotective peptide vs mitochondrial-targeted peptide.
Glutathione vs NAD+
Antioxidant tripeptide vs energy coenzyme.
FOXO4-DRI vs Epitalon
Senolytic peptide vs telomerase-activating peptide.
BPC-157 + TB-500 Stack vs BPC-157 alone
Repair-pair combo vs single-peptide protocol.
CagriSema vs Tirzepatide
GLP-1 + amylin combination vs GLP-1/GIP dual.
CJC-1295/Ipamorelin Stack vs CJC-1295 with DAC
Pulse-aligned combo vs continuous albumin-bound GH stimulus.
BPC-157 + TB-500 Stack vs TB-500 alone
Combo recovery protocol vs single systemic peptide.
Adamax vs Selank
Modified Semax-derived peptide vs anxiolytic Selank.
B7-33 Quick Reference
Single-chain relaxin analog for fibrosis research.
PNC-27 vs FOXO4-DRI
Cancer-membrane-targeting peptide vs senolytic peptide.
ACTH 1-39 vs Cortagen
Full ACTH hormone vs Khavinson cortex peptide.
VIP vs Orexin A
Vasoactive intestinal peptide vs wake-promoting orexin.
Orexin A vs Orexin B
The two hypocretin neuropeptides compared.
DSIP vs Orexin A
Sleep-promoting peptide vs wake-promoting peptide.
P21 vs Cerebrolysin
CNTF-derived neurogenesis peptide vs porcine brain extract.
ARA-290 vs BPC-157
Tissue-protective EPO fragment vs soft-tissue repair peptide.
KPV vs Thymosin Alpha-1
Anti-inflammatory tripeptide vs immune-modulating thymic peptide.
Ipamorelin vs CJC-1295 with DAC
Selective ghrelin agonist vs long-acting GHRH analog.
Tesamorelin vs AOD-9604
Visceral-fat GHRH analog vs C-terminal GH fragment.
Selank vs Cerebrolysin
Anxiolytic peptide vs broad neurotrophic brain extract.
Humanin vs MOTS-c
Two mitochondrial-derived signaling peptides.
Thymosin Alpha-1 vs Cerebrolysin
Defined immune peptide vs porcine brain extract.
Matrixyl vs Snap-8
Collagen-stimulating peptide vs extended expression-line peptide.
MOTS-c vs SLU-PP-332
Mitochondrial-derived peptide vs ERR-driven exercise mimetic.
EPO vs HGH
Erythropoietin red-cell research vs growth hormone.
DSIP vs Selank
Delta-sleep peptide vs anxiolytic heptapeptide.
HGH vs Ipamorelin
Exogenous GH vs endogenous-release stimulation.
HGH Frag 176-191 vs Tesamorelin
Fat-only GH fragment vs visceral-fat-focused GHRH analog.
AHK-Cu vs PTD-DBM
Copper-peptide hair research vs Wnt-pathway hair peptide.
Explore by research topic
Weight Loss Peptides
GLP-1s, dual & triple agonists, amylin analogs, and fat-loss research.
Healing Peptides
Tendon, ligament, gut, and wound healing research peptides.
Hair Growth Peptides
Copper peptides and follicle-research compounds.
Libido Peptides
Melanocortin and oxytocin pathway research.
Longevity Peptides
Telomere, NAD+, and senescence research peptides.
Brain Peptides
Nootropic and neuroprotective peptide research.
Sleep Peptides
Delta-wave sleep and stress-recovery research.
Immune Support Peptides
Thymic and antimicrobial peptide research.