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D2C Peptides
Testagen vial

Testagen 20 mg

Sold as Testagen 20mg

$60 In stock

Strength
Ships from

For research use only. Not for human or veterinary use.

Ships from the USA or Canada. Shipping details

Testagen is a synthetic tetrapeptide, Lys-Glu-Asp-Gly (KEDG), from the Russian peptide bioregulator family tied to Vladimir Khavinson's group.95 Its developers link it to male reproductive function, but peer-reviewed work is limited to cell, chemistry and bird studies.5615 Each vial holds 20 mg of freeze-dried (lyophilized) powder.16 FDA has not approved it as a drug.13

Specifications

Sequence (one-letter code)KEDG45
Sequence (three-letter code)H-Lys-Glu-Asp-Gly-OH (Lys-Glu-Asp-Gly)34
Molecular formulaC17H29N5O91
Molar mass447.4 g/mol1
CAS numberNone found in the sources checked
PubChem CID123863700 (record titled H-Lys-Glu-Asp-Gly-OH; a PubChem search for the name Testagen finds no record)12
FormFreeze-dried (lyophilized) powder16
Vial contents20 mg per vial16
Strength20 mg
Ships fromUSA, Canada
StorageThe supplier says to keep the unmixed vial in a refrigerator and out of light.16 For long-term storage, peptide makers give colder targets for freeze-dried peptides: -20 °C (GenScript) or below -15 °C (Bachem).1718

Supplies for Testagen

Bulk and wholesale orders

Labs planning repeat or multi-site Testagen work can apply for a wholesale account; its terms are confirmed during the application.

Wholesale detailsApply for a wholesale account

Questions about Testagen

About Testagen

Testagen is a short synthetic peptide: lysine, glutamic acid, aspartic acid and glycine, in that order (Lys-Glu-Asp-Gly, or KEDG).34 It belongs to the "peptide bioregulator" family developed in Russia by Vladimir Khavinson's group,9 whose 2021 review lists KEDG for regulation of male reproductive function.5 Where the sequence came from is not settled. The Khavinson group ties it to testis tissue, while bird studies from another Russian group describe KEDG as synthesized from the amino acid makeup of anterior pituitary extracts.596

This listing offers Testagen for sale as a 20 mg research vial. Its sequence differs from Epithalon (AEDG) only in the first amino acid.3 Claims that it raises testosterone or aids fertility rest on a developer report printed in a Russian drug reference, not a peer-reviewed journal.915 What is Testagen? weighs that evidence, the safety data and the doses used in studies.

Research highlights

  • HeLa cells (2011, cell study): fluorescent-tagged Testagen reached the cytoplasm, nucleus and nucleolus, and in test-tube work it appeared to bind preferentially to short DNA strands containing CAG.3
  • Pituitary-removed chicks (2008, animal): after 40 days of KEDG or AEDG, thyroid-stimulating hormone and thyroid hormone levels rose and thyroid structure recovered; the abstract does not separate the two peptides.7
  • Young chickens and old hens (2011, animal): KEDG or AEDG given for 40 days lessened thyroid disturbances after pituitary removal, with a weaker hormonal effect in old hens.6
  • Birds of different ages (2013, animal): both peptides aided recovery of thymus structure after pituitary removal, KEDG more than AEDG.8
  • Rat testis cultures (developer report, not peer reviewed): Testagen enlarged the growth zone of testis explants by 54.1% from young rats and 40.6% from old rats, with no significant effect on 16 other tissues.9
  • Men aged 54 to 68 (developer report, not peer reviewed, n=48): after 20 days of oral capsules plus standard care, mean testosterone went from 6.1 to 7.3 ng/mL, against 6.5 ng/mL after standard care alone.9

Regulatory status

Testagen is not an FDA-approved drug: as of October 2026, DailyMed holds no label for it.13 It is not on FDA's list of compounding substances that may present significant safety risks (Category 2), nor among that list's withdrawn nominations.14 ClinicalTrials.gov registers no trial of the peptide; its one "Testagen" entry is a study of Testagen TDS-Testosterone, an unrelated testosterone product.11 In Russia, a product named Testagen is sold as an oral dietary supplement, not as a drug.10 WADA's 2026 Prohibited List does not name Testagen, but its class S0 bans at all times any pharmacological substance not covered elsewhere on the List that has no current approval by any government health authority for human therapeutic use.12

Handling and storage

KEDG carries three residues (Lys, Glu and Asp) that GenScript, a peptide maker, lists as prone to absorbing moisture, so the vial is best kept tightly capped, ideally in a desiccator.17 Bachem, another maker, advises against storing peptides in solution because they may slowly break down.18 The supplier gives a 30-day window for a mixed vial kept cold; we found no published stability study for Testagen solutions to back that figure.1615 For molar work, 1 mg of KEDG is about 2.24 micromoles at 447.4 g/mol, by our arithmetic.1 The reconstitution guide covers diluent choice and sterile technique, and the reconstitution calculator turns a diluent volume into a concentration.

Frequently asked questions

Where does Testagen ship from?

Testagen ships from the USA and Canada to addresses across the United States. Pick an origin in the selector at the top of this page, and the stock badge shows whether the 20 mg vial is available from that origin. Order policies are on the shipping page and the returns page.

How should Testagen be stored when it arrives?

Put the vial in a refrigerator, away from light, as the supplier directs.16 For longer storage, GenScript gives -20 °C as its general condition for freeze-dried peptides.17 Testagen's sequence holds lysine, glutamic acid and aspartic acid, residues GenScript says tend to draw moisture from the air, so keep the cap tight and let a cold vial warm to room temperature before opening it.1718

Is there a certificate of analysis for Testagen?

Lab documents for our products are listed on the lab results page as they become available. On a Testagen certificate, check that the identity result fits KEDG, which PubChem lists as C17H29N5O9 with a molar mass of 447.4 g/mol.1 Look for net peptide content as well as purity: Bachem notes that a powder above 95% HPLC purity can still be only 70 to 90% peptide by weight, the rest being counter-ions and water.19

What supplies are used with a Testagen vial?

Five lab supplies are listed with this vial. Bacteriostatic water dissolves the powder, a 3 mL Luer-Lok syringe fitted with an 18G 1-inch needle moves the diluent, insulin syringes measure small volumes, and alcohol swabs clean the stopper. The reconstitution calculator shows the concentration a chosen diluent volume gives. All of this is bench handling, not directions for use in people.

Is Testagen for human use?

No. It is sold for laboratory research and labeled not for human or veterinary use.16 PubMed holds no peer-reviewed human study of Testagen, and no trial of the peptide is registered.1511 The only human report we located was written by its developers, concerned oral supplement capsules, and appeared in a Russian drug reference rather than a peer-reviewed journal.9 Injected Testagen has no published human data.915

Written by D2C Peptides Editorial Team.

Pending qualified review.

Updated .

Sources

  1. PubChem CID 123863700 (H-Lys-Glu-Asp-Gly-OH) properties. PubChem, NCBI, NIH, 2026.
  2. PubChem name lookup for 'testagen'. PubChem, NCBI, NIH, 2026.
  3. Penetration of short fluorescence-labeled peptides into the nucleus in HeLa cells and in vitro specific interaction of the peptides with deoxyribooligonucleotides and DNA. Biochemistry (Moscow), 2011.
  4. The Inhibitory Effect and Adsorption Properties of Testagen Peptide on Copper Surfaces in Saline Environments. Molecules, 2025.
  5. Peptide Regulation of Gene Expression: A Systematic Review. Molecules, 2021.
  6. Effects of peptides Lys-Glu-Asp-Gly and Ala-Glu-Asp-Gly on hormonal activity and structure of the thyroid gland in hypophysectomized young chickens and old hens. Bulletin of Experimental Biology and Medicine, 2011.
  7. Effect of tetrapeptides Lys-Glu-Asp-Gly and Ala-Glu-Asp-Gly on the structure and function of the thyroid gland in neonatally hypophysectomized chickens. Bulletin of Experimental Biology and Medicine, 2008.
  8. Effect of peptides Lys-Glu-Asp-Gly and Ala-Glu-Asp-Gly on the morphology of the thymus in hypophysectomized young and old birds. Bulletin of Experimental Biology and Medicine, 2013.
  9. Clinical and experimental study of the peptide bioregulator Testagen (Khavinson V.Kh., Ryzhak G.A.; article in Russian). RLS Encyclopedia (Register of Medicines of Russia), rlsnet.ru, 2021.
  10. Testagen (dietary supplement) product monograph (in Russian). RLS Encyclopedia (Register of Medicines of Russia), rlsnet.ru, 2022.
  11. ClinicalTrials.gov study search for 'testagen'. ClinicalTrials.gov, National Library of Medicine, 2026.
  12. World Anti-Doping Code International Standard: Prohibited List 2026. World Anti-Doping Agency (WADA), 2025.
  13. DailyMed SPL search for drug name 'testagen'. DailyMed, National Library of Medicine, 2026.
  14. Certain Bulk Drug Substances for Use in Compounding that May Present Significant Safety Risks. U.S. Food and Drug Administration, 2026.
  15. PubMed search for 'testagen'. PubMed, National Library of Medicine, 2026.
  16. Supplier product specification.
  17. Peptide Storage and Handling Guidelines. GenScript.
  18. Handling and Storage Guidelines for Peptides (Peptide Guide, chapter 8). Bachem.
  19. Care and Handling of Peptides. Bachem, 2021.
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