Testagen
Peptide Bioregulator
Also known as Lys-Glu-Asp-Gly (KEDG)
Testagen is the tetrapeptide Lys-Glu-Asp-Gly, studied in research on endocrine tissue models, frequently alongside the related peptide Ala-Glu-Asp-Gly.
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This product is intended strictly for laboratory research use within the United States. It is not approved by the FDA for the diagnosis, treatment, cure, or prevention of any disease. Not for human or veterinary use.
By purchasing, you confirm the material will be used solely for lawful research purposes in accordance with applicable U.S. federal, state, and local regulations.
Testagen is the tetrapeptide Lys-Glu-Asp-Gly, studied in research on endocrine tissue models, frequently alongside the related peptide Ala-Glu-Asp-Gly.
Experimental work examines thymus and thyroid morphology and hormonal activity in hypophysectomized animals.
Third-party tested for purity, ID, quantity.
Coming Soon
The certificate of analysis for the 20mg lot is being finalised and will be published here as soon as the lab returns it.
Testagen is among the short peptides that appear in paired-comparison studies with Epitalon. Published work has examined the effects of Lys-Glu-Asp-Gly and Ala-Glu-Asp-Gly on thymus morphology, on thyroid structure and hormonal activity in hypophysectomized young and old animals, and on immunity and hemostasis endpoints.
The sequence also appears in reviews of peptide-regulated cell differentiation, where KEDG is associated with immune-cell differentiation models.
Testagen was characterized within the Russian peptide-bioregulator programme as one of a family of tetrapeptides differing by a single residue.
Much of the published work deliberately compares it against Epitalon, which isolates the contribution of the N-terminal lysine.
Research into the KEDG sequence focuses on endocrine and immune tissue endpoints in hypophysectomized animal models, usually in direct comparison with Ala-Glu-Asp-Gly. Frameworks evaluate thymus and thyroid morphology, hormonal activity, and differentiation signaling.
4 of the 4 areas below are addressed directly by a paper cited on this page.
Thymus and thyroid morphology models
Addressed on this page by Pateyk 2013, Kuznik 2010, Kuznik 2011. Each is linked to its source record in the references below, so what was measured — and in what system — can be read rather than taken on trust.
- Pateyk, AV. et al. (2013) — Effect of peptides Lys-Glu-Asp-Gly and Ala-Glu-Asp-Gly on the morphology of the thymus in hypophysectomized young and old birds
- Kuznik, BI. et al. (2010) — Effects of hypophyseal Lys-Glu-Asp-Gly and Ala-Glu-Asp-Gly synthetic peptides on immunity, hemostasis, morphology and functions of the thyroid gland in neonatally hypophysectomized chicken and one-year-old birds
- Kuznik, BI. et al. (2011) — 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
Hypophysectomized-animal endocrine research
Addressed on this page by Pateyk 2013, Kuznik 2011, Kuznik 2008. Each is linked to its source record in the references below, so what was measured — and in what system — can be read rather than taken on trust.
- Pateyk, AV. et al. (2013) — Effect of peptides Lys-Glu-Asp-Gly and Ala-Glu-Asp-Gly on the morphology of the thymus in hypophysectomized young and old birds
- Kuznik, BI. et al. (2011) — 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
- Kuznik, BI. et al. (2008) — 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
Immune-cell differentiation studies
Addressed on this page by Khavinson 2020. Each is linked to its source record in the references below, so what was measured — and in what system — can be read rather than taken on trust.
- Khavinson, V. et al. (2020) — Peptide Regulation of Cell Differentiation
Comparative short-peptide structure-activity work
Addressed on this page by Kuznik 2011, Kuznik 2008, Pateyk 2013. Each is linked to its source record in the references below, so what was measured — and in what system — can be read rather than taken on trust.
- Kuznik, BI. et al. (2011) — 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
- Kuznik, BI. et al. (2008) — 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
- Pateyk, AV. et al. (2013) — Effect of peptides Lys-Glu-Asp-Gly and Ala-Glu-Asp-Gly on the morphology of the thymus in hypophysectomized young and old birds
The references section of this page cites 5 primary papers published between 2008 and 2020 — a limited but non-trivial record. Every citation is linked to its PubMed or DOI record so it can be read rather than taken on trust, and the summaries above describe what those papers report rather than what the compound is claimed to do.
Worth noting when weighing that record: roughly 60% of the citations here list Kuznik as lead author. A literature concentrated in one research group has not been independently replicated to the same degree as one drawn from many, and that is a real limitation on how far the findings can be generalised — regardless of how consistent the individual results look.
Research compounds attract claims that outrun their evidence. Below are the ones most often encountered for Testagen, set against what the papers cited on this page actually report. Where the record is thin or contested, that is stated rather than smoothed over.
Testagen is commonly described online in connection with faster healing from injury and improved recovery. In the research literature the same compound is filed under thymus and thyroid morphology models, hypophysectomized-animal endocrine research and immune-cell differentiation studies.
The 5 papers cited on this page, published between 2008 and 2020 describe laboratory and animal work. None reports a controlled trial in humans. Findings in cell culture or in a rodent model describe what happened in that system; they do not establish that the same occurs in humans, and this compound is not approved for human use.
Presented as having independent scientific backing.
Around 60% of the papers cited here list Kuznik as lead author. A literature concentrated in one research group has not been independently replicated to the degree its volume suggests, and that is a real limit on how far the findings generalise — however consistent the individual results appear.
Nothing above is a statement of what this material does. It is a summary of what has been published and what has not. Eppix Labs supplies research materials only and provides no dosing, administration or protocol guidance.
Every lot of Testagen is independently assayed before it is released, and the certificate for the lot shipped is published rather than summarised. Where a certificate for a current lot is not yet posted, the lot has not yet been released against it.
Researchers who buy Testagen in the United States through Eppix Labs receive a batch-labelled vial whose certificate is published against that lot code, so the material can be matched to its analysis rather than to a generic specification.
- Lyophilized storage
- −20 °C long-term; stable at room temperature in transit
- After reconstitution
- 2–8 °C
- Light
- Protect from UV and direct light
- Freeze-thaw
- Avoid repeated cycles
- Vehicle
- Bacteriostatic water in most published protocols
- Format
- Lyophilized powder
Testagen is supplied as lyophilized powder. In the dry state the material is comparatively stable, which is why it ships at ambient temperature without a cold chain; once reconstituted it is a peptide in solution and the handling constraints tighten considerably. At 4 residues it is short enough to be produced by solid-phase synthesis, and the published sequence on this page is what an identity assay is checked against.
Repeated freeze-thaw cycling is the handling error most likely to degrade material of this class, because each cycle concentrates solutes at the ice boundary. Where a protocol calls for the same vial across multiple sessions, the published literature generally describes aliquoting after reconstitution rather than re-freezing the whole volume.
Vials may appear empty on arrival. Lyophilized material collects at the base of the vial and is often not visible until the vial is inspected under direct light.
- 1 × sealed glass vial in the strength selected (20mg / Single Vial, 20mg / 5-Pack, 20mg / 10-Pack available), batch-labelled
- Batch documentation for the lot shipped, once its certificate is published
- Discreet outer packaging with no product names on the exterior
- FedEx, tracked, typically 1–3 business days domestically
- Bacteriostatic water or any other reconstitution vehicle
- Syringes, needles or filters
- Dosing, administration or protocol guidance of any kind
Reconstitution materials are sourced separately. The reconstitution calculator on this site works out concentrations for a given volume, but it is an arithmetic tool for laboratory record-keeping and not a protocol.
No. Eppix Labs products are supplied exclusively for laboratory research. We do not provide dosing, administration, or usage guidance.
Each unit contains the labeled quantity of Testagen. Independent third-party analysis verifies purity, identity, and net content per batch.
The unit contains only the research compound. Any laboratory materials required for reconstitution or experimental procedures must be sourced separately.
Duration depends entirely on research design, storage conditions, and laboratory protocol.
Effect of peptides Lys-Glu-Asp-Gly and Ala-Glu-Asp-Gly on the morphology of the thymus in hypophysectomized young and old birds
PubMedEffects 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
PubMedEffect of tetrapeptides Lys-Glu-Asp-Gly and Ala-Glu-Asp-Gly on the structure and function of the thyroid gland in neonatally hypophysectomized chickens
PubMedEffects of hypophyseal Lys-Glu-Asp-Gly and Ala-Glu-Asp-Gly synthetic peptides on immunity, hemostasis, morphology and functions of the thyroid gland in neonatally hypophysectomized chicken and one-year-old birds
PubMedRelated
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