Peptide directory

Every compound tracked in the PepIndex record, each carrying a score out of 100. That score combines two things: the strength of the published research located, and the quality of the evidence the market produces for it — the assayed purity, lot-to-lot consistency and third-party testing across the vendors that carry it. It is a score of evidence, not of the substance: nothing here rates a compound as safe, effective or suitable for any purpose.

Browse by research focus

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Highest score Evidence tier Most popular Most listed A–Z

Showing 22 of 22 compounds — Compounds that do not fall into the groups above.

S
Glutathione
Other
94.7
A tripeptide of glutamate, cysteine and glycine that is the body’s principal intracellular antioxidant, supplied for research and compounding in its reduced form.
LongevitySkin & hair
16 vendors15 certificates99.6% mean purity
Tier S evidence · Established popularity
A
PT-141
Other
93.9
A melanocortin receptor agonist derived from melanotan II, studied for effects on sexual arousal. Its approved form is known as bremelanotide.
Hormonal
17 vendors11 certificates99.7% mean purity
Tier A evidence · High popularity
A
Semax
Other
93.3
A synthetic peptide derived from a fragment of adrenocorticotropic hormone (ACTH 4-10), studied in relation to cognition and neuroprotection. It was developed in Russia.
Cognitive
22 vendors21 certificates99.6% mean purity
Tier A evidence · High popularity
B
Epithalon
Other
93.1
A synthetic tetrapeptide (Ala-Glu-Asp-Gly) based on the pineal peptide epithalamin, studied in relation to telomerase activity and ageing.
Longevity
23 vendors13 certificates99.5% mean purity
Tier B evidence · Established popularity
A
Ipamorelin
Other
93
A synthetic pentapeptide that acts as a growth hormone secretagogue in published preclinical work. Supplied as a lyophilised powder.
Muscle & growth
26 vendors26 certificates99.7% mean purity
Tier A evidence · High popularity
A
Selank
Other
92
A synthetic heptapeptide based on the immune peptide tuftsin, studied in relation to anxiety and cognition. It was developed in Russia.
CognitiveSleep & stress
18 vendors20 certificates99.6% mean purity
Tier A evidence · High popularity
A
Kisspeptin
Other
91.5
A peptide encoded by the KISS1 gene that signals through the KISS1 receptor to regulate release of gonadotropin-releasing hormone, central to reproductive endocrinology.
Hormonal
16 vendors14 certificates99.4% mean purity
Tier A evidence · Established popularity
A
CJC-1295
Other
88.8
A synthetic analogue of growth hormone releasing hormone. Two distinct forms circulate under similar names — with and without a drug affinity complex — and vendors are not consistent about which they list. This index records the form named on the certificate rather than the form named in the product title.
Muscle & growth
19 vendors12 certificates99.5% mean purity
Tier A evidence · High popularity
D
FOXO4-DRI
Other
70.3
A synthetic peptide studied as a senolytic — a compound aimed at clearing senescent cells — in preclinical ageing models.
Longevity
3 vendors1 certificates99.1% mean purity
Tier D evidence · Niche popularity
B
Cerebrolysin
Other
52
A peptide preparation derived from porcine brain tissue, studied in stroke, dementia and traumatic brain injury. It is approved as a medicine in some countries but not in the United States.
Cognitive
1 vendors0 certificates
Tier B evidence · Established popularity
B
Humanin
Other
50.3
A mitochondrial-derived peptide studied for cytoprotective and neuroprotective effects in models of ageing and metabolism.
Longevity
1 vendors0 certificates
Tier B evidence · Niche popularity
B
Oxytocin
Other
50
A nine-amino-acid neuropeptide hormone produced in the hypothalamus. It is an approved medicine and is one of the most heavily studied peptides in physiology and behavioural neuroscience.
HormonalCognitive
4 vendors0 certificates
Tier B evidence · Established popularity
D
Pinealon
Other
42.6
A short synthetic peptide (Glu-Asp-Arg) from the Khavinson peptide-bioregulator research programme, studied preclinically in models of oxidative stress and neuroprotection.
LongevityCognitive
5 vendors0 certificates
Tier D evidence · Niche popularity
B
HCG
Other
38
Human chorionic gonadotropin, a glycoprotein hormone with luteinising-hormone-like activity. It is an approved prescription medicine used in reproductive endocrinology and is listed by vendors here as a research material.
Hormonal
0 vendors0 certificates
Tier B evidence · Established popularity
B
Menotropins
Other
38
Human menopausal gonadotropin (hMG), a purified preparation carrying follicle-stimulating and luteinising hormone activity. It is an approved fertility medicine.
Hormonal
0 vendors0 certificates
Tier B evidence · Niche popularity
B
Methylene Blue
Other
38
Methylene blue (methylthioninium chloride), a synthetic phenothiazine dye and redox-active compound with a research history stretching back to the nineteenth century. It is an approved medicine for specific indications.
CognitiveLongevity
0 vendors0 certificates
Tier B evidence · Established popularity
B
Rapamycin (Sirolimus)
Other
38
Rapamycin (sirolimus), a macrolide inhibitor of the mTOR pathway. It is an approved prescription medicine and one of the most-studied compounds in ageing and longevity research.
Longevity
0 vendors0 certificates
Tier B evidence · High popularity
B
Triptorelin
Other
38
A synthetic decapeptide agonist of gonadotropin-releasing hormone (GnRH). It is an approved prescription medicine used in endocrinology and oncology.
Hormonal
0 vendors0 certificates
Tier B evidence · Established popularity
C
Vilon
Other
38
A synthetic dipeptide (Lys-Glu) from the Khavinson peptide-bioregulator research programme, studied preclinically for effects on gene expression, immune function and ageing in animal models.
LongevityGut & immune
0 vendors0 certificates
Tier C evidence · Niche popularity
A
Dihexa
Other
37.6
A small peptide derivative studied for effects on synaptic connections and neurotrophic signalling in models of cognition. It is supplied as a research compound.
Cognitive
3 vendors0 certificates
Tier A evidence · Niche popularity
B
Abaloparatide
Other
33.2
A synthetic 34-amino-acid analogue of parathyroid-hormone-related protein (PTHrP). It is an approved prescription medicine for osteoporosis.
LongevityHormonal
0 vendors0 certificates
Tier B evidence · Niche popularity
D
PE-22-28
Other
27
A shortened synthetic analogue of spadin, studied preclinically as a TREK-1 potassium-channel inhibitor with antidepressant-like activity in animal models. The indexed literature under this exact name is very limited.
Cognitive
1 vendors0 certificates
Tier D evidence · Niche popularity