Many peptide websites give numbers without a source. We think a reader should be able to check every number we publish.
So we publish the data and the tools behind this site. Anyone can read them, reuse them, and tell us when something is wrong.
Why we publish our data
Peptide Pharmacokinetics Dataset
The dataset gives the elimination half-life and the time to peak (Tmax) of 35 therapeutic and research peptides, with the route and the species of each study. For what these values mean and why they differ so much, read our guide to peptide half-life.
| Level | Meaning | Peptides |
|---|---|---|
| A | FDA prescribing information | 10 |
| B | Human clinical trial with pharmacokinetic data | 8 |
| C | Animal data only, or human data without drug pharmacokinetics | 2 |
| D | No published pharmacokinetic data found | 15 |
15 of the 35 peptides (43 %) have no published pharmacokinetic data. For these, the dataset gives no value. We checked every label value on DailyMed and every PMID on PubMed.
All 35 peptides, value by value
Each value links to its primary source. An empty cell means that we found no published value.
| Peptide | Half-life | Tmax | Route, species | Level | Source |
|---|---|---|---|---|---|
| Semaglutide | 168 h | 24-72 h | SC, human | A | FDA label Ozempic injection |
| Tirzepatide | 120 h | 8-72 h | SC, human | A | FDA label Mounjaro |
| Liraglutide | 13 h | 8-12 h | SC, human | A | FDA label Victoza |
| Dulaglutide | 120 h | 48 h (24-72) | SC, human | A | FDA label Trulicity |
| Exenatide | 2.4 h | 2.1 h | SC, human | A | FDA label Byetta |
| Tesamorelin | 0.13 h | 0.15 h | SC, human | A | FDA label Egrifta SV |
| Bremelanotide | 2.7 h (1.9-4.0) | 1 h (0.5-1.0) | SC, human | A | FDA label Vyleesi |
| Teriparatide | 1 h | 0.5 h | SC, human | A | FDA label Forteo |
| Setmelanotide | 11 h | 8 h | SC, human | A | FDA label Imcivree |
| Octreotide | 1.8 h (1.7-1.9) | 0.4 h | SC, human | A | FDA label Sandostatin |
| Retatrutide | 144 h | SC, human | B | Urva S et al. Lancet 2022 | |
| Cagrilintide | 180 h (159-195) | 24-72 h | SC, human | B | Enebo LB et al. Lancet 2021 |
| CJC-1295 with DAC | 168 h (139-194) | SC, human | B | Teichman SL et al. J Clin Endocrinol Metab 2006 | |
| Cotadutide | 11 h (9.5-12.1) | 4.5-9.0 h | SC, human | B | Ambery PD et al. Br J Clin Pharmacol 2018 |
| Thymosin alpha-1 | <3 h | 1-2 h | SC, human | B | Rost KL et al. Int J Clin Pharmacol Ther 1999 |
| Ipamorelin | 2 h | IV, human | B | Gobburu JV et al. Pharm Res 1999 | |
| GHRP-6 | 2.5 h (1.4-3.6) | IV, human | B | Cabrales A et al. Eur J Pharm Sci 2013 | |
| Thymosin beta-4 | 0.5-2.1 h | 0.05-0.25 h | IV, human | B | Wang X et al. J Cell Mol Med 2021 |
| Hexarelin | IV, human | C | Imbimbo BP et al. Eur J Clin Pharmacol 1994 | ||
| BPC-157 | <0.5 h | IM, IV, rat, dog | C | He L et al. Front Pharmacol 2022 | |
| Sermorelin | No published data | D | |||
| Melanotan II | No published data | D | |||
| Semax | No published data | D | |||
| CJC-1295 (no DAC) | No published data | D | |||
| TB-500 | No published data | D | |||
| GHK-Cu | No published data | D | |||
| KPV | No published data | D | |||
| Selank | No published data | D | |||
| DSIP | No published data | D | |||
| AOD-9604 | No published data | D | |||
| LL-37 | No published data | D | |||
| Epitalon | No published data | D | |||
| GHRP-2 | No published data | D | |||
| IGF-1 LR3 | No published data | D | |||
| MOTS-c | No published data | D | |||
The formulas of our calculators
Our peptide calculator uses simple formulas: concentration, volume to draw and units on an insulin syringe. We publish them as a small JavaScript library. A test checks that it gives the same results as this site.
How we check every PubMed citation
A PMID can exist and still point to another paper. Before we publish an article, a tool reads the real title of each cited PMID on PubMed and compares it with the cited title. When they differ, it searches for the right article, or removes the link.
This step is part of our editorial policy. The tool is open source, so other publishers can use it too.
How to cite and how to report an error
To cite the dataset, use this reference:
Klow Peptide (2026). Peptide Pharmacokinetics Dataset (v1.0.0) [Data set]. Zenodo. https://doi.org/10.5281/zenodo.23464099
Found an error? Open an issue on GitHub with the source. We change a value only with a primary source.
These resources are for research and education only. They are not medical advice and they give no dosing guidance.