Testagen
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Synthetic tetrapeptide (Lys-Glu-Asp-Gly) bioregulator proposed to support testicular function and testosterone production via tissue-specific gene expression regulation.
Methodological Note: >95% of published research on this peptide originates from the Khavinson bioregulation group (Institute of Bioregulation and Gerontology, St. Petersburg). Independent replication by Western laboratories is lacking. All evidence should be interpreted with this single-group limitation in mind.
Quick Facts
| Property | Value |
|---|---|
| Also Known As | KEDG tetrapeptide, Lys-Glu-Asp-Gly |
| Category | Sexual Health / Reproductive / Khavinson Bioregulator |
| Sequence | Lys-Glu-Asp-Gly (KEDG, 4 amino acids) |
| Molecular Weight | ~434 Da |
| Molecular Formula | C16H28N4O9 |
| PubChem CID | N/A — research peptide |
| Administration | SubQ |
| Typical Dose Range | 10-20 mcg/day (from Khavinson protocols) |
| Half-Life | Very short (minutes; typical of tetrapeptides) |
| Storage | Lyophilized: -20C long-term; 2-8C short-term. Reconstituted: 2-8C for 2-4 weeks |
| FDA Status | NOT FDA-approved. Approved in Russia as bioregulator; no Western regulatory approval |
| WADA Status | Prohibited under S0 (non-approved substances) |
Mechanism of Action
Testagen (Lys-Glu-Asp-Gly) is a synthetic tetrapeptide developed by the Khavinson group, derived from the amino acid analysis of testicular tissue extracts. It belongs to the class of ultrashort peptide bioregulators proposed to modulate gene expression by directly interacting with DNA and chromatin structures in a tissue-specific manner.
The proposed mechanism involves nuclear penetration and direct DNA interaction. Fluorescence-labeled Testagen (KEDG) has been shown to penetrate into the cytoplasm, nucleus, and nucleolus of HeLa cells (PMID: 22117547). The peptide preferentially binds to CAG-containing DNA sequences, and this site-specific interaction is proposed to control epigenetic regulation of cell genetic functions.
In the Khavinson framework, Testagen is proposed to regulate gene expression in testicular tissue specifically, supporting testosterone production and spermatogenesis. The peptide is also reported to induce differentiation of stem cells into immune system cells (PMID: 31808038), suggesting broader activity beyond testicular tissue.
The precise molecular targets and signaling pathways remain uncharacterized by standard pharmacological methods. No receptor binding, dose-response curves, or structure-activity relationships have been established by independent laboratories.
Key Research Areas
- Nuclear penetration — Demonstrated cell membrane and nuclear envelope penetration via fluorescence studies
- DNA binding specificity — Preferential binding to CAG-containing sequences in vitro
- Cell differentiation — Induction of immune cell differentiation from stem cells
- Testicular function — Proposed tissue-specific support (minimal direct evidence)
Evidence Level Summary
| Evidence Type | Count | Notes |
|---|---|---|
| Human RCTs | 0 | No randomized controlled trials |
| Human observational | 0 | No human clinical studies |
| Animal in vivo | 0 | No animal studies specific to testicular function |
| In vitro | 2 | Nuclear penetration/DNA binding; THP-1 cell study |
| Systematic reviews | 1 | Khavinson self-review of peptide gene regulation (2021) |
Clinical Applications
- Sexual Health — Proposed support for testosterone production (no clinical evidence)
- Fertility — Proposed spermatogenesis support (no clinical evidence)
Protocols Using This Peptide
- No established clinical protocols. Used in Khavinson bioregulation research protocols only.
Ageless Peps Products
- APWS-Testagen-Vial — Testagen Vial, wholesale only
Dosing Reference
Research Dosing Ranges (from literature)
| Route | Dose Range | Frequency | Duration | Source |
|---|---|---|---|---|
| SubQ | 10-20 mcg | Daily | 10-20 days | Khavinson protocols |
Cycling
Khavinson protocols typically recommend 10-20 day treatment courses with 1-3 month intervals between courses. No independent validation exists.
Contraindications & Safety
- Contraindications: Unknown — no systematic safety studies
- Common side effects: Unknown — no human clinical data
- Drug interactions: Unknown — no interaction studies
- Pregnancy/nursing: Contraindicated (no safety data)
- Special populations: No data available
Synergistic Combinations
Per Khavinson protocols (unvalidated):
Related Research
| PMID | Title | Year | Study Type |
|---|---|---|---|
| 22117547 | Short Peptides Nuclear Penetration and DNA Interaction in HeLa Cells | 2011 | In vitro |
| 34834147 | Peptide Regulation of Gene Expression: A Systematic Review | 2021 | Systematic Review |
| 35408963 | Peptides Regulating Proliferative Activity in THP-1 Cell Line | 2022 | In vitro |
References
- PMID 22117547 — Nuclear penetration and DNA binding
- PMID 34834147 — Systematic review of peptide gene regulation
- PMID 35408963 — THP-1 cell line study
Related
#peptide #sexual-health #reproductive #khavinson-bioregulator #subq