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Testagen
Last reviewed: July 13, 2026 by The Peptide Catalog Team
A Khavinson testis tetrapeptide (Lys-Glu-Asp-Gly / KEDG) marketed for reproductive-tissue support; contains no steroid and is unrelated to testosterone, with a verified sequence but no reproductive-outcome studies. Testagen is a testis-derived peptide bioregulator studied for reproductive-tissue support.
Overview
Core Benefits
Key AdvantagesThese are educational summaries of commonly discussed effects in wellness/regenerative contexts, not guarantees.
Testagen Results Timeline
ProgressionTimeline is illustrative and non-guaranteed. Outcomes vary and are commonly discussed alongside training, nutrition, sleep, and cycling practices.
How It WorksShort-Peptide Bioregulator — Testis / Reproductive (Preclinical Evidence Only)
Target → Signal → Effect → Outcomes
Reproductive Tissue / Gene Promoters (proposed)
Testagen is the tetrapeptide Lys-Glu-Asp-Gly (KEDG) from the Khavinson program. Despite the name it contains no steroid and is unrelated to testosterone. It is proposed to regulate tissue-specific gene expression — shown to bind DNA in cell culture, not validated in reproductive tissue.
Nuclear Binding (in-vitro only)
The one verified compound-specific study showed KEDG entering the nucleus and binding DNA sequence-specifically in HeLa cells — a mechanism demonstration, not a reproductive-tissue study.
No Reproductive-Outcome Data
There are no studies of Testagen on spermatogenesis, Leydig cells, or any reproductive endpoint. Marketed reproductive mechanisms are unsupported.
Unknown in Humans
No human evidence exists. Any libido/reproductive claim is marketing extrapolation, not data.
What Makes This Peptide Different
Testagen is a research tetrapeptide (KEDG) with a verified sequence but — unusually — zero reproductive-outcome evidence. Its only real data is a cell-culture DNA-binding study. No steroid, no hormone effect, no human trials.
Testagen Vendors
Glacier Aminos
Dosing ProtocolReproductive-Tissue Support (Research / No Human Data)
Educational reference only. Individual responses vary. Consult healthcare provider before use.
Why This Dosing Protocol
Why short courses? Convention by analogy to Khavinson pulse dosing, not a tested Testagen protocol.
Reconstitution Calculator
Dilution math and unit conversions. Prefilled using a common vial size for this peptide.
Open calculatorStorage & Handling
Storage at a glance
Proper storage temperatures, shelf life, reconstitution best practices, and travel tips for lyophilized and reconstituted peptides.
Handling specifics
Educational overview on storage, labeling, and traceability considerations for lab environments. Consult primary literature and vendor documentation for specifics.
- Freezer (-20°C): 1+ year
- Refrigerator (2-8°C): 1-3 months
- Room temperature: 2-3 weeks (emergency only)
- MUST refrigerate at 2-8°C
- 4-week maximum shelf life
- NEVER freeze after reconstitution
- Use bacteriostatic water for multi-dose
FAQ
What is Testagen?
Testagen is a synthetic testis tetrapeptide — Lys-Glu-Asp-Gly, or KEDG — from the Russian Khavinson bioregulator program, marketed for reproductive-tissue support. Despite the name it contains no steroid and is unrelated to testosterone. Its sequence is verified, but there are no reproductive-outcome studies.
Does Testagen raise testosterone?
No. Testagen is a short peptide with no steroid content and no documented effect on testosterone levels. The name refers to the testis tissue it was modeled from, not to the hormone. Any hormonal framing in marketing is unsupported.
How strong is the evidence behind Testagen?
Weak. The only verified compound-specific study concerns nuclear-binding mechanism in cell culture; there are no reproductive or clinical outcome studies. Sold as a research chemical.
How long does reconstituted peptide last?
Once mixed with bacteriostatic water, peptides remain stable for up to 4 weeks when refrigerated at 2-8°C (36-46°F). Unopened powder can last 1+ year in the freezer. Get our complete Storage & Travel Guide.
Is this peptide legal to purchase?
Peptides sold "for research purposes only" are legal to purchase in the US, but are not FDA-approved for human use outside of specific medical applications. Always consult a healthcare provider before use.
New to peptides?
Take our Peptide Match tool to find the best peptide for your goals. You can also read our Complete Guide to Peptides to learn the basics.
Testagen Research Articles
Testagen Dosage Chart: 10-20 Day Course Protocol
A synthetic testis tetrapeptide with no validated human dose — and no steroid. What research-chem sources report, plus the extract-vs-synthetic caveat.
side-effectsTestagen Side Effects: What the Evidence Shows
Despite the name, Testagen isn't testosterone — and its near-zero side-effect claim rests on almost no independent data. Here's the real picture.
resultsTestagen Results: Week-by-Week Timeline
Testagen has no human trials at all — so what shapes its reported timeline? Labeled community reports and the Russian short-course convention.
reconstitutionTestagen Reconstitution: 20mg Vial Mixing Chart
Testagen has no validated human concentration. See how community resources describe mixing the 20mg vial, plus syringe-unit math and storage limits.
Disclosure: we may earn affiliate commission from qualifying purchases. Educational information only — not medical advice.