What is Testagen?
Testagen is a tetrapeptide bioregulator (Lys-Glu-Asp-Leu) from the Khavinson programme targeting testicular tissue. Studied for Leydig cell gene expression normalisation, testosterone biosynthesis pathway modulation, and age-related androgen decline models. Research use only.
Research Applications
Leydig Cell Biology
Testosterone biosynthesis, StAR protein expression, steroidogenesis
Testicular Geroprotection
Age-related Leydig cell atrophy, late-onset hypogonadism models
Spermatogenesis Research
Sertoli cell support, sperm cell development, testicular gene expression
HPG Axis Studies
LH receptor sensitivity, gonadotropin feedback, pituitary-gonadal axis
Androgenic Gene Expression
AR-target gene profiles, SHBG modulation, androgen metabolism
Quick Specs
| Form | Lyophilized powder |
| Purity | ≥99% by HPLC — every batch |
| CAS Number | N/A — proprietary tetrapeptide |
| Molecular Formula | Lys-Glu-Asp-Leu tetrapeptide |
| Identity | MS molecular weight confirmed — every batch |
| Peptide Type | Testicular Tissue Bioregulator |
| COA | Janoshik-independent, publicly verifiable |
| Manufacture | In-house Fmoc SPPS — Qingdao, China |
| Storage | -20°C sealed | 2–8°C reconstituted (4 weeks) |
| Shelf Life | 24 months (unopened) |
Certificate of Analysis (COA)
Frequently Asked Questions
How do I reconstitute Testagen?
Add 1–2 mL bacteriostatic water to the lyophilized vial and swirl gently until clear. Dissolves within 1 minute.
How should Testagen be stored?
Store lyophilized vials at −20°C. Reconstituted solution is stable at 2–8°C for up to 4 weeks.
What is Testagen used for in longevity research?
Testagen is primarily studied for age-related Leydig cell decline and the late-onset hypogonadism model. Research from the Khavinson institute suggests it normalises steroidogenic gene expression in testicular tissue as a geroprotective intervention.
Peptide Research Tools: Use Vesta’s free peptide calculators — reconstitution, BAC water, dosing, half-life, and mixing charts.
International shipping: 7–14 days