Pentadecapeptide and thymosin-derived sequences
Copper(II) complexes and short tripeptides
Incretin and amylin analogue sequences
GRF-derived sequences, 5 to 44 residues
Cyclic and linear alpha-MSH analogues
Hepta- and nonapeptides, acetylated and amidated forms
Thymic peptides, dinucleotides and reference tripeptides
39 guides on research peptides: what they are and how they are made, how an HPLC purity and MS identity report is read and checked, how lyophilized powder is stored, how to compare vendors on checkable facts, the US legal status of research peptides and the FDA category lists, and per-compound buying guides with CAS numbers, sequences and molecular weights. Updated October 2026.
Per-compound guides: sequence, CAS and registry records, molecular weight, salt form, and vial sizes with price per mg.
AOD-9604 is not the same as tesamorelin: AOD-9604 is a 16-residue peptide acid (YLRIVQCRSVEGSCGF, C78H123N23O23S2, 1815....
As of September 24, 2026, the FDA compounding page (content current as of April 22, 2026) lists BPC-157 in its table hea...
NN9838 is the research code the Pepta Labs listing records for cagrilintide, which Pepta Labs lists as a nominal 10 mg l...
GHK-Cu on the Pepta Labs listing is CAS 89030-95-5 (UNII 6BJQ43T1I9, registered under prezatide copper), the neutral 1:1...
Ipamorelin acetate is in Category 2 of FDA's interim compounding policies under section 503B, date added September 29, 2...
Thymosin alpha-1 (INN thymalfasin) is not the same compound as TB-500: it is an N-acetylated 28-residue peptide, C129H21...
Melanotan-II (MT-II) is CAS 121062-08-6, the synthetic cyclic heptapeptide amide Ac-Nle-cyclo[Asp-His-D-Phe-Arg-Trp-Lys]...
NAD+ (nicotinamide adenine dinucleotide, INN nadide) is a non-peptide dinucleotide registered as CAS 53-84-9, PubChem CI...
PT-141 and bremelanotide are the same molecule: PT-141 is the research code and bremelanotide the INN for the cyclic hep...
Pepta Labs lists retatrutide in five vial sizes, 10 mg, 15 mg, 20 mg, 30 mg and 60 mg of lyophilized powder, and the pri...
SS-31, elamipretide and MTP-131 are three names for one compound, the synthetic tetrapeptide amide H-D-Arg-Dmt-Lys-Phe-N...
N-Acetyl Semax Amidate (Ac-Met-Glu-His-Phe-Pro-Gly-Pro-NH2, C39H54N10O10S, 854.98 Da) is Semax (C37H51N9O10S, 813.90 Da,...
On the FDA compounding page with content current as of April 22, 2026, TB-500 (listed as thymosin beta-4 fragment LKKTET...
Pepta Labs lists tirzepatide in 10, 15, 30, 40 and 60 mg vials, each sold singly or in 3- and 5-packs, and the price per...
How research peptides are made, tested, stored and bought, and how an analytical report is read and verified.
Reversed-phase HPLC reports a peptide's purity as the main peak's percentage of total integrated peak area; mass spectro...
Research peptides are made by solid-phase peptide synthesis: the chain is built one protected amino acid at a time on re...
A research peptide vendor can be checked on twelve facts before an order: five about the analytical report, three about ...
A peptide certificate of analysis (COA) is a laboratory document that records the reversed-phase HPLC purity (area-perce...
Third-party peptide testing is the analysis of a peptide sample by a laboratory with no part in making or selling it: re...
Lyophilized research peptides are stored as sealed dry powder at 2-8 °C (36-46 °F) on arrival or at −20 °C (−4 °F) for l...
A research peptide is a synthetic chain of amino acids sold as a sealed vial of freeze-dried powder for laboratory resea...
The US legal status of research peptides and the FDA category lists, by compound and date.
On the FDA significant-safety-risks compounding page dated April 22, 2026, four peptides remain in the Category 2 table:...
Research use only (RUO) is a labelling designation: a chemical reference material sold under it is labelled and marketed...
Vendor closures and status reports with dated sources.
As of September 24, 2026, none of the seven third-party US research peptide vendors on the Pepta Labs status list showed...
Eternal Peptides shut its website down at 11:59 p.m. Eastern on September 15, 2026, and on September 27, 2026 eternalpep...
Peptide Sciences, a US online seller of research peptides, stopped taking orders in March 2026 and is not back online: o...
As of September 24, 2026, five US research peptide vendors have posted permanent closures in 2026: Science.bio (site not...
Science.bio is permanently closed: an Internet Archive capture of January 28, 2026 shows its store with no notice, and a...
As of September 26, 2026, no news report or public record reviewed by Pepta Labs says that Apex Peptides was searched or...
Tables and definitions: CAS numbers and molecular weights, expected masses, sequence notation, counter-ions and registry records.
Monoisotopic mass is the mass of a molecule built only from the most abundant isotope of each element, while average mas...
Reversed-phase HPLC purity is the main peak's share of total integrated peak area under stated column, gradient and wave...
Net peptide content is the mass fraction of a lyophilized solid that is peptide, determined by amino-acid analysis, quan...
Mod GRF 1-29 and CJC-1295 no DAC are two names for one molecule: GRF(1-29)-NH2 with D-Ala2, Gln8, Ala15 and Leu27, formu...
Livagen is the synthetic tetrapeptide H-Lys-Glu-Asp-Ala-OH (KEDA), formula C18H31N5O9, molecular weight 461.47 g/mol, wi...
Mass spectrometry confirms a peptide's identity by matching the observed mass of its ions, converted from m/z and charge...
Several listed research peptides have more than one public registry record: thymulin (C33H54N12O15, 858.86 g/mol) is rec...
Peptide sequence notation writes residues from the N-terminus on the left to the C-terminus on the right, in three-lette...
A reference table of CAS Registry Numbers, molecular formulas, molecular weights and residue counts for every research p...
A trifluoroacetate (TFA) salt and an acetate salt of the same peptide differ only in the counter-ion: each protonated ba...