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Professor Peptides
Research compound

Testagen

Also known as Testagen · Lys-Glu-Asp-Gly · KEDG · KEDG peptide · H-Lys-Glu-Asp-Gly-OH

Lys-Glu-Asp-Gly tetrapeptide; nuclear-penetrating peptide with CAG-site DNA binding

Last reviewed · Educational reference — not medical advice.

NCKEDG4 residuesN → C
  • Small / Pro
  • Hydrophobic
  • Polar
  • Acidic
  • Basic
Primary sequence, N → C, by residue class.
Half-life
Not characterised in published pharmacokinetic studies
Route
Subcutaneous or intramuscular in the source literature
Status
Research compound — short peptide bioregulator
Sequence
KEDG
Mechanism
Reported to penetrate the cell nucleus and bind DNA sequence-selectively with a preference for CAG-containing sequences, proposed to influence cytosine methylation status and therefore gene activity. No receptor identified; no endocrine mechanism demonstrated.
01

Overview

Testagen is the synthetic tetrapeptide Lys-Glu-Asp-Gly (KEDG). The sequence is well attested: it is stated explicitly in the Khavinson-group nuclear-penetration study ("testagen, Lys-Glu-Asp-Gly") and again, independently, in a 2025 corrosion-chemistry paper that synthesised and characterised the peptide as H-Lys-Glu-Asp-Gly-OH.

The biological work on Testagen concerns DNA binding. Fluorescein-labelled Testagen penetrated the cytoplasm, nucleus and nucleolus of HeLa cells. Fluorescence-quenching measurements showed it binds deoxyribooligonucleotides sequence-selectively — like epithalon and pinealon, it preferentially bound CAG-containing sequences, whereas bronchogen preferred CTG-containing sequences. CNG sites are targets for cytosine DNA methylation in eukaryotes, which is the basis for the group's claim that these peptides regulate gene activity epigenetically.

Testagen is marketed as a testicular bioregulator for testosterone support. No indexed study measures testosterone, spermatogenesis, or any reproductive endpoint after Testagen administration. That marketing claim is not supported by the published literature.

An unusual footnote: the best-characterised property of KEDG in the recent literature is not biological at all — it is a copper corrosion inhibitor, achieving roughly 86% inhibition efficiency on copper in sodium chloride solution.

Research areasPeptide–DNA sequence-selective bindingEpigenetic regulation by ultrashort peptidesChromatin and nuclear penetrationMaterials chemistry (copper corrosion inhibition)
02

What the evidence shows

Separated by study type
HumanClinical trials and human studies
No human studies of any kind in the indexed literature.
AnimalRodent and other animal models
No indexed animal outcome studies.
In vitroCell and tissue studies
Penetrates cytoplasm, nucleus and nucleolus of HeLa cells; binds deoxyribooligonucleotides sequence-selectively with preference for CAG-containing sequences, as measured by Stern-Volmer fluorescence quenching constants.
03

Key studies & findings

2 studies
  1. 1

    Fluorescein-labelled testagen (Lys-Glu-Asp-Gly) penetrated HeLa cell nucleus and nucleolus and bound deoxyribooligonucleotides sequence-selectively, preferring CAG-containing sequences.

    In vitro2011Biochemistry (Moscow), 2011 (opens in new tab)

  2. 2

    KEDG synthesised as H-Lys-Glu-Asp-Gly-OH achieved approximately 86% corrosion inhibition efficiency on copper in sodium chloride solution — an independent confirmation of the sequence and its synthesis, in a non-biological context.

    In vitro2025Molecules, 2025 (opens in new tab)

04

Benefits & effects

2 documented

  • Nuclear and nucleolar penetration in cultured cells

    Verified

  • Sequence-selective DNA binding at CAG-containing sites

    Verified
05

Side effects & safety

1 reported

Safety noteResearch compound for laboratory use only. No regulatory safety review, no established human safety database, and no controlled toxicology data in the public literature.

Recorded in the cited literature No controlled human safety data exist for this compound.

  • Marketed reproductive/testosterone claims are unsupported by indexed research

    unknown
06

Limitations & open questions

Nearly all published work on this compound originates from a single research programme (the St Petersburg Institute of Bioregulation and Gerontology, Khavinson group) and its collaborators. Independent replication outside that network is sparse to non-existent, sample sizes are small, and much of the source literature is published in Russian-language journals with limited peer-review transparency. Effects reported in cell culture and in aged-donor lymphocytes have not been shown to produce clinical outcomes in controlled human trials. Specific to Testagen: the compound is marketed as a testicular or testosterone-supporting bioregulator, but no indexed study measures testosterone, spermatogenesis, Leydig cell function, or any reproductive endpoint. The reproductive positioning is a marketing claim, not a research finding.

07

Pharmacology

Testagen is the tetrapeptide Lys-Glu-Asp-Gly. No PubChem record was retrievable under the trade name in this session, and no published pharmacokinetic study exists. The molecular formula computed from the sequence is C17H29N5O9.

08

Frequently asked questions

Does Testagen raise testosterone?

There is no published evidence that it does. No indexed study measures testosterone or any reproductive endpoint after Testagen administration. The testicular positioning comes from the tissue the original extract was derived from, not from a demonstrated hormonal effect.

Is the Lys-Glu-Asp-Gly sequence reliable?

Yes — unusually so for this family. It is stated in the 2011 Khavinson-group nuclear-penetration paper and independently in a 2025 Molecules paper that synthesised H-Lys-Glu-Asp-Gly-OH.

How is Testagen different from Epithalon?

Epithalon is Ala-Glu-Asp-Gly (AEDG); Testagen is Lys-Glu-Asp-Gly (KEDG). They differ in the first residue only. Both were reported to preferentially bind CAG-containing DNA sequences.

09

Citations

3 sources
  1. 1
  2. 2
  3. 3
    Peptide Regulation of Gene Expression: A Systematic Review (opens in new tab)Khavinson VKh, Popovich IG, Linkova NS, Mironova ES, Ilina AR (2021) · doi:10.3390/molecules26227053