Directory
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
Showing 19 of 19 compounds — Literature concerns tissue repair models.
- S
VIP
Tissue & recovery95.6Vasoactive intestinal peptide, a 28–amino-acid signalling peptide with roles in vasodilation, secretion and inflammation. Its related drug is known as aviptadil.
Gut & immune7 vendors5 certificates99.7% mean purityTier S evidence · Niche popularity
- B
GHRP-6
Tissue & recovery95.2A growth-hormone-releasing hexapeptide and ghrelin-receptor agonist studied for stimulating growth hormone secretion.
Muscle & growth3 vendors1 certificates99.8% mean purityTier B evidence · Established popularity
- S
Thymosin Alpha-1
Tissue & recovery94.3A 28–amino-acid peptide derived from the thymus gland, studied for effects on immune modulation. An approved form is marketed in some countries as thymalfasin.
Gut & immune12 vendors10 certificates99.5% mean purityTier S evidence · Established popularity
- B
SS-31
Tissue & recovery93.7A mitochondria-targeted tetrapeptide (also known as elamipretide) studied for its effects on mitochondrial function and cellular energy.
LongevityHealing15 vendors12 certificates99.7% mean purityTier B evidence · Established popularity
- S
ARA-290
Tissue & recovery93.1An eleven–amino-acid peptide derived from the structure of erythropoietin, designed to engage tissue-protective signalling without the red-blood-cell effects of erythropoietin.
HealingGut & immune12 vendors6 certificates99.7% mean purityTier S evidence · Niche popularity
- A
DSIP
Tissue & recovery92.6Delta sleep-inducing peptide, a nine–amino-acid peptide first isolated from cerebral blood, studied in relation to sleep regulation and stress responses.
Sleep & stress23 vendors18 certificates99.6% mean purityTier A evidence · Established popularity
- A
Sermorelin
Tissue & recovery92.5A synthetic peptide corresponding to the first 29 amino acids of growth-hormone-releasing hormone, which stimulates the pituitary gland to release growth hormone.
Muscle & growth16 vendors11 certificates99.4% mean purityTier A evidence · Established popularity
- B
Hexarelin
Tissue & recovery92.3A synthetic growth-hormone-releasing hexapeptide studied for growth hormone secretion and cardiovascular effects.
Muscle & growth5 vendors1 certificates99.1% mean purityTier B evidence · Established popularity
- C
BPC-157
Tissue & recovery91.6A synthetic peptide of fifteen amino acids, derived from a sequence identified in human gastric juice. It is supplied as a lyophilised powder and is one of the most widely listed compounds across the vendors in this index.
HealingGut & immune32 vendors34 certificates99.5% mean purityTier C evidence · High popularity
- B
IGF-1 LR3
Tissue & recovery89.9A modified, longer-acting analogue of insulin-like growth factor 1, altered to extend its half-life and reduce binding to carrier proteins. It is a common cell-culture reagent.
Muscle & growth12 vendors6 certificates99.2% mean purityTier B evidence · Established popularity
- A
TB-500
Tissue & recovery88.7A synthetic peptide fragment related to the naturally occurring protein thymosin beta-4. Supplied as a lyophilised powder.
Healing23 vendors20 certificates99.1% mean purityTier A evidence · High popularity
- D
KPV
Tissue & recovery80.9A tripeptide (lysine-proline-valine) corresponding to the C-terminal fragment of alpha-melanocyte-stimulating hormone, studied for anti-inflammatory signalling.
Gut & immune25 vendors19 certificates99.5% mean purityTier D evidence · Established popularity
- B
LL-37
Tissue & recovery66A human cathelicidin-derived antimicrobial peptide studied for antimicrobial activity, immune modulation and wound healing.
Gut & immune7 vendors4 certificates96.1% mean purityTier B evidence · Established popularity
- B
Follistatin-344
Tissue & recovery52An isoform of follistatin, an endogenous antagonist of myostatin and related TGF-beta ligands. Its published literature is predominantly preclinical and concerns muscle, fibrosis and reproductive biology.
Muscle & growth1 vendors0 certificatesTier B evidence · Niche popularity
- C
Larazotide
Tissue & recovery52Larazotide acetate, a synthetic octapeptide studied as a tight-junction regulator (a zonulin antagonist) and investigated clinically in coeliac disease.
Gut & immune1 vendors0 certificatesTier C evidence · Niche popularity
- B
GHRP-2
Tissue & recovery49.9A growth-hormone-releasing peptide (also known as pralmorelin) studied for stimulating growth hormone secretion.
Muscle & growth2 vendors0 certificatesTier B evidence · Established popularity
- B
HGH (Somatropin)
Tissue & recovery38Recombinant human growth hormone (somatropin), a 191-amino-acid protein identical to the pituitary hormone. It is one of the most extensively studied compounds in endocrinology and is supplied by the vendors in this index as a research material.
Muscle & growthLongevity0 vendors0 certificatesTier B evidence · High popularity
- B
Mecasermin (IGF-1)
Tissue & recovery38Recombinant human insulin-like growth factor-1 (mecasermin). It is an approved prescription medicine for severe primary IGF-1 deficiency and is listed by vendors here as a research material.
Muscle & growth0 vendors0 certificatesTier B evidence · Niche popularity
- B
Thymalin
Tissue & recovery38A polypeptide preparation extracted from thymus tissue, studied for immunomodulatory effects. It has clinical use in some countries but is not approved in the United States.
Gut & immuneLongevity0 vendors0 certificatesTier B evidence · Niche popularity