Cosmic Peptides research library

Peptide reference

59 research peptides, each with its identity and properties calculated from the structure: formula, masses, charge, isoelectric point, absorbance and hydropathy, with expected mass spectrometry ions on each entry.

Last reviewed · Editorial policy

Download the table: CSV · JSON. Calculated values; measured values for a lot are on its certificate of analysis.

Another sequence? The peptide calculator works out the same properties for any sequence you enter.

By family: Growth hormone–releasing hormone analogs (4) · Growth hormone secretagogues (4) · Melanocortin-related peptides (4) · Thymic peptides and fragments (5) · Angiotensins and kinins (6) · Neuropeptides (3) · Opioid peptides (7) · Oxytocin and vasopressin (2) · Amyloid-β peptides (2) · Mitochondrial-derived peptides (2) · Hypothalamic peptides (3)

Compared in detail: Sermorelin and CJC-1295 (no DAC) · Sermorelin and Tesamorelin · GHRP-6 and GHRP-2 · GHRP-6 and Hexarelin · Leu-enkephalin and Met-enkephalin · Thymosin β4 and TB-500 · α-MSH and KPV · Amyloid-β (1–42) and Amyloid-β (1–40) · Oxytocin and Arg-vasopressin · Endomorphin-1 and Endomorphin-2 · Angiotensin II and Angiotensin III · Kallidin and Bradykinin · Angiotensin I and Angiotensin II

Calculated properties (click a heading to sort)
PeptideResiduesFormulaAverage mass (g/mol)Monoisotopic mass (Da)Charge, pH 7pIε280 (M−1cm−1)Family
α-MSH13C77H109N21O19S 1,664.911,663.79291.2 10.446,990Melanocortin-related peptides
Amyloid-β (1–40)40C194H295N53O58S 4,329.874,327.1484-2.3 5.431,490Amyloid-β peptides
Amyloid-β (1–42)42C203H311N55O60S 4,514.114,511.2696-2.3 5.431,490Amyloid-β peptides
Angiotensin (1–7)7C41H62N12O11 899.02898.46610.2 7.541,490Angiotensins and kinins
Angiotensin I10C62H89N17O14 1,296.501,295.67750.5 7.711,490Angiotensins and kinins
Angiotensin II8C50H71N13O12 1,046.201,045.53450.2 7.541,490Angiotensins and kinins
Angiotensin III7C46H66N12O9 931.11930.50761.2 9.351,490Angiotensins and kinins
AOD-960416C78H123N23O23S2 1,815.101,813.86041.0 9.351,615Growth hormone fragments
Apelin-1313C69H111N23O16S 1,550.851,549.83003.2 12.520Other peptides
ARA-29011C51H84N16O21 1,257.321,256.5997-2.0 3.610Other peptides
Arg-vasopressin9C46H65N15O12S2 1,084.241,083.43792.0 11.311,615Oxytocin and vasopressin
β-Endorphin31C158H251N39O46S 3,465.033,462.82213.0 10.172,980Opioid peptides
Bombesin14C71H110N24O18S 1,619.871,618.81511.2 —5,500Neuropeptides
BPC-15715C62H98N16O22 1,419.561,418.7042-2.0 3.880Short synthetic peptides
Bradykinin9C50H73N15O11 1,060.231,059.56142.0 12.500Angiotensins and kinins
CJC-1295 (no DAC)29C152H252N44O42 3,367.953,365.89364.0 10.952,980Growth hormone–releasing hormone analogs
DSIP9C35H48N10O15 848.82848.3301-2.0 3.555,500Short synthetic peptides
Dynorphin A (1–13)13C75H126N24O15 1,603.991,602.98345.0 12.251,490Opioid peptides
Endomorphin-14C34H38N6O5 610.72610.29041.0 9.356,990Opioid peptides
Endomorphin-24C32H37N5O5 571.68571.27951.0 9.351,490Opioid peptides
Epitalon4C14H22N4O9 390.35390.1387-2.0 3.550Short synthetic peptides
Fibrinopeptide A16C63H97N19O26 1,536.581,535.6852-3.0 3.740Other peptides
[Glu1]-Fibrinopeptide B14C66H95N19O26 1,570.591,569.6696-3.0 3.780Other peptides
FOXO4-DRI46C228H388N86O64 5,358.155,354.975011.0 12.516,990Other peptides
GHK-Cu3C14H24N6O4 340.38340.18591.2 9.700Short synthetic peptides
GHRH (1–44) amide44C215H358N72O66S 5,039.735,036.65915.0 11.432,980Growth hormone–releasing hormone analogs
GHRP-26C45H55N9O6 817.99817.42752.0 ——Growth hormone secretagogues
GHRP-66C46H56N12O6 873.03872.44462.2 —11,000Growth hormone secretagogues
Gonadorelin10C55H75N17O13 1,182.311,181.57301.2 11.306,990Hypothalamic peptides
Hexarelin6C47H58N12O6 887.06886.46022.2 ——Growth hormone secretagogues
Humanin24C119H204N34O32S2 2,687.272,685.48221.9 9.820Mitochondrial-derived peptides
Ipamorelin5C38H49N9O5 711.87711.38572.2 ——Growth hormone secretagogues
Kallidin10C56H85N17O12 1,188.401,187.65643.0 12.520Angiotensins and kinins
Kisspeptin-1010C63H83N17O14 1,302.461,301.63052.0 11.316,990Other peptides
KPV3C16H30N4O4 342.44342.22671.0 9.700Melanocortin-related peptides
Leu-enkephalin5C28H37N5O7 555.63555.26930.0 6.091,490Opioid peptides
LL-3737C205H340N60O53 4,493.344,490.57546.0 11.350Other peptides
Melittin26C131H229N39O31 2,846.522,844.75426.0 —5,500Other peptides
Met-enkephalin5C27H35N5O7S 573.67573.22570.0 6.091,490Opioid peptides
MOTS-c16C101H152N28O22S2 2,174.622,173.10773.0 10.648,480Mitochondrial-derived peptides
Neurotensin13C78H121N21O20 1,672.951,671.90971.0 9.982,980Neuropeptides
Nociceptin17C79H129N27O22 1,809.071,807.98054.0 12.530Opioid peptides
Oxytocin9C43H66N12O12S2 1,007.191,006.43651.0 9.351,615Oxytocin and vasopressin
Pinealon3C15H26N6O8 418.41418.1812-1.0 4.180Short synthetic peptides
PT-1417C50H68N14O10 1,025.181,024.52430.2 9.505,500Melanocortin-related peptides
Selank7C33H57N11O9 751.89751.43412.0 11.650Short synthetic peptides
Semax7C37H51N9O10S 813.93813.3480-0.8 5.360Melanocortin-related peptides
Sermorelin29C149H246N44O42S 3,357.933,355.81874.0 10.952,980Growth hormone–releasing hormone analogs
Somatostatin-1414C76H104N18O19S2 1,637.901,636.71672.0 10.815,625Hypothalamic peptides
SS-314C32H49N9O5 639.80639.38573.0 11.70—Other peptides
Substance P11C63H98N18O13S 1,347.651,346.72813.0 —0Neuropeptides
TB-5007C38H68N10O14 889.02888.49160.0 7.360Thymic peptides and fragments
Tesamorelin44C221H366N72O67S 5,135.865,132.71664.0 11.432,980Growth hormone–releasing hormone analogs
Thymopentin5C30H49N9O9 679.78679.36531.0 9.301,490Thymic peptides and fragments
Thymosin α128C129H215N33O55 3,108.323,106.5041-6.0 3.810Thymic peptides and fragments
Thymosin β443C212H350N56O78S 4,963.514,960.4863-3.0 4.500Thymic peptides and fragments
Thymulin9C33H54N12O15 858.86858.38320.0 7.200Thymic peptides and fragments
TRH3C16H22N6O4 362.39362.17030.2 —0Hypothalamic peptides
VIP28C147H237N43O43S 3,326.833,324.74013.2 10.322,980Other peptides

— in the pI column: no isoelectric point (the peptide is charged at every pH). — in the ε280 column: not calculated (a non-standard aromatic residue). Methods and constants are cited on each entry.

Cite this page

Text

Cosmic Peptides. (2026, October 25). Peptide reference. Cosmic Peptides Research Library. Retrieved October 26, 2026, from https://cosmicpeptides.com/research/peptides

BibTeX

@misc{cosmicpeptides_research_peptides,
  author       = {{Cosmic Peptides}},
  title        = {Peptide reference},
  howpublished = {Cosmic Peptides Research Library},
  year         = {2026},
  month        = oct,
  url          = {https://cosmicpeptides.com/research/peptides},
  urldate      = {2026-10-26},
  note         = {Last reviewed 2026-10-25}
}

RIS

TY  - ELEC
AU  - Cosmic Peptides
TI  - Peptide reference
T2  - Cosmic Peptides Research Library
PB  - Cosmic Peptides
PY  - 2026
DA  - 2026/10/25
UR  - https://cosmicpeptides.com/research/peptides
Y2  - 2026/10/26
LA  - en
ER  -

Cite the date the page was last reviewed, October 25, 2026, as its version. Reference managers such as Zotero can save this page directly.

Changes to this page

  1. Published Peptide reference: 20 more peptides, five new families, five more comparisons

    Opioid peptides, oxytocin and vasopressin, amyloid-β, kinin and angiotensin fragments, hypothalamic and mitochondrial-derived peptides and others, each checked against PubChem; families and comparisons for the new groups.

  2. Published Structural comparisons of related peptides

    Eight pairs of related peptides side by side: the sequences aligned, calculated properties, and how mass spectrometry and HPLC tell them apart.

  3. Published Peptide reference: 15 more peptides and six family pages

    Reference and calibration peptides and relatives of catalog families, each checked against PubChem, and family pages comparing members and showing how each relates in sequence to its family reference.

  4. Published Peptide reference: 24 entries and a property table

    Identity, calculated properties, expected mass spectrometry ions and analytical notes for 24 research peptides, all calculated from the structure, with the full table as CSV and JSON.

Changes of substance are listed here; wording changes are not. Every correction is also on the corrections log.

For in vitro laboratory research only. Not for human or veterinary use. This library describes chemistry, analytical methods and published laboratory research; it gives no guidance on use in people or animals.