Peptide Glossary
Peptides users track in PepTalk Peptides
A neutral, journaling-tool reference. Classification only — no efficacy claims, no pharmacology editorialising.
PepTalk Peptides is a journaling tool, not a pharmacy and not a clinic. This glossary catalogs the peptides users most often log in their personal protocol records — what class each compound sits in within the research literature, what units users typically record, and where the entry appears in the PepTalk Peptides app.
Every page here is neutral. We do not make efficacy claims. We do not say a peptide "reduces" or "improves" anything. We describe what users JOURNAL — units, cadence, route of administration — and we point repeatedly to the fact that protocol decisions belong with a licensed clinician, not a journaling app.
If you arrived here looking for a sales pitch, you won't find one. If you're a PepTalk Peptides user looking for a clean reference for what fields to capture when you log a session, that's exactly what each entry below provides.
PepTalk Peptides's in-app Stack Builder lets you compose your own protocol from any combination of the entries in this glossary. The reconstitution and dosing calculators help with the math. Aimee, the in-app AI character, is built to keep your logging consistent — never to recommend doses or replace your clinician. Learn more on the Aimee page.
GLP-1 / incretin class
Semaglutide
Semaglutide is a GLP-1 receptor agonist marketed under multiple brand names.
Tirzepatide
Tirzepatide is a dual GIP / GLP-1 receptor agonist marketed as Mounjaro and Zepbound.
Liraglutide
Liraglutide is a GLP-1 receptor agonist marketed under Victoza and Saxenda.
Retatrutide
Retatrutide is an investigational triple GIP / GLP-1 / glucagon receptor agonist studied in trial settings.
Cagrilintide
Cagrilintide is an investigational long-acting amylin analog studied in combination protocols.
Tesofensine
Tesofensine is an investigational triple monoamine reuptake inhibitor.
Healing / tissue research peptide
BPC-157
BPC-157 is a synthetic pentadecapeptide studied in the research literature as a tissue-research compound.
TB-500
TB-500 is a synthetic fragment of the naturally-occurring peptide Thymosin Beta-4, studied in preclinical research.
GHK-Cu
GHK-Cu is a naturally-occurring tripeptide complex with copper, referenced in cosmetic and tissue-research literature.
Thymosin Beta-4
Thymosin Beta-4 is a naturally-occurring 43-amino-acid peptide referenced in actin-regulation research.
SNAP-8
SNAP-8 is a synthetic octapeptide referenced in topical cosmetic-research literature.
Matrixyl
Matrixyl is a topical pentapeptide referenced in cosmetic-research literature.
Argireline
Argireline is a synthetic hexapeptide referenced in topical cosmetic-research literature.
Nootropic research peptide
Semax
Semax is a synthetic heptapeptide derived from ACTH(4-10), referenced in nootropic research.
Selank
Selank is a synthetic heptapeptide derived from tuftsin, referenced in anxiolytic research.
Cerebrolysin
Cerebrolysin is a mixture of low-molecular-weight peptides derived from porcine brain tissue.
Dihexa
Dihexa is an angiotensin IV analog studied in preclinical neuroscience research.
Cortagen
Cortagen is a synthetic tetrapeptide referenced in bioregulator research literature.
Cortexin
Cortexin is a polypeptide preparation referenced in nootropic research literature.
DSIP
DSIP is a nine-amino-acid neuropeptide referenced in sleep-research literature.
Synapsin
Synapsin is a topical formulation referenced in nootropic compounding literature.
Selank-Amidate
Selank-Amidate is an amidated variant of Selank referenced in research literature.
P21
P21 is a synthetic peptide referenced in nootropic-research literature.
Cyclic peptide / longevity research
Epitalon
Epitalon is a synthetic tetrapeptide referenced in pineal-research literature.
FOXO4-DRI
FOXO4-DRI is a synthetic peptide referenced in cellular senescence research literature.
PNC-27
PNC-27 is a synthetic peptide referenced in preclinical cell-research literature.
Humanin
Humanin is a 24-amino-acid mitochondrially-encoded peptide.
Growth hormone secretagogue
Sermorelin
Sermorelin is a synthetic growth hormone-releasing hormone (GHRH) analog.
Ipamorelin
Ipamorelin is a synthetic pentapeptide referenced in growth-hormone secretagogue research literature.
CJC-1295
CJC-1295 is a synthetic GHRH analog referenced in growth-hormone secretagogue research literature.
MK-677
MK-677 (Ibutamoren) is an orally bioavailable ghrelin receptor agonist studied in research literature.
GHRP-2
GHRP-2 is a synthetic hexapeptide referenced in growth-hormone secretagogue research literature.
GHRP-6
GHRP-6 is a synthetic hexapeptide referenced in growth-hormone secretagogue research literature.
Hexarelin
Hexarelin is a synthetic hexapeptide in the ghrelin-mimetic class.
MGF
MGF is a splice variant of IGF-1 referenced in muscle-research literature.
IGF-1 LR3
IGF-1 LR3 is a long-acting analog of insulin-like growth factor 1.
Follistatin
Follistatin is a glycoprotein referenced in myostatin-research literature.
Tesamorelin
Tesamorelin is a synthetic GHRH analog prescribed under the brand Egrifta.
Melanocortin agonist class
PT-141
PT-141 (Bremelanotide) is a melanocortin receptor agonist prescribed under the brand name Vyleesi.
Melanotan II
Melanotan II is a synthetic analog of alpha-melanocyte-stimulating hormone referenced in research literature.
Oxytocin
Oxytocin is a nine-amino-acid neuropeptide referenced in research literature.
Thymic peptide
Antimicrobial peptide
Mitochondrial / NAD precursor
NAD+
NAD+ is a coenzyme referenced in metabolic and aging-research literature.
NMN
NMN is a nucleotide referenced in NAD+ precursor research literature.
Nicotinamide Riboside
Nicotinamide Riboside is a form of vitamin B3 referenced in NAD+ precursor research literature.
Glutathione
Glutathione is a tripeptide antioxidant present in cells throughout the body.
Glycine
Glycine is the smallest of the 20 standard amino acids.
PQQ
PQQ is a redox cofactor referenced in mitochondrial-research literature.
SS-31
SS-31 (Elamipretide) is a mitochondrially-targeted peptide referenced in research literature.
Polyphenol / longevity research compound
Spermidine
Spermidine is a polyamine naturally present in many foods.
Resveratrol
Resveratrol is a stilbenoid polyphenol naturally present in grapes and other plants.
Quercetin
Quercetin is a flavonoid naturally present in many plant foods.
Berberine
Berberine is an alkaloid naturally present in several plant species.
Tracked compound
Adipotide
Adipotide is an experimental peptide referenced in preclinical research literature.
AOD-9604
AOD-9604 is a synthetic fragment of human growth hormone studied in research literature.
Vitamin B12 (Methylcobalamin)
Methylcobalamin is the bioactive form of vitamin B12.
Methylene Blue
Methylene blue is a phenothiazine compound used as a stain and referenced in research literature.
5-Amino-1MQ
5-Amino-1MQ is a small molecule referenced in NNMT-research literature.
Kisspeptin
Kisspeptin is a peptide encoded by the KISS1 gene, referenced in endocrine-research literature.
Gonadorelin
Gonadorelin is a synthetic form of gonadotropin-releasing hormone.
HCG
HCG is a hormone prescribed by licensed clinicians for several medical indications.
Amlexanox
Amlexanox is a small-molecule compound referenced in metabolic-research literature.
Frequently asked questions
Is PepTalk Peptides a peptide pharmacy?+
No. PepTalk Peptides does not sell peptides, supplements, or medications. It is a journaling app. Sourcing decisions belong with you and a licensed clinician.
Does PepTalk Peptides make health claims about peptides?+
No. Every entry in this glossary uses neutral classification language sourced from the research literature. We do not say a peptide treats, cures, prevents, or improves anything.
What if I'm new to peptide journaling — where do I start?+
Start with the Protocol tab inside PepTalk Peptides. Add an entry for the peptide you want to log, capture units and cadence, and review each week. The reconstitution calculator handles the math.
Why is the disclaimer on every page?+
PepTalk Peptides is a journaling tool. It does not provide medical advice, diagnose, or treat any condition. Consult your healthcare provider before starting, changing, or stopping any protocol.