Testagen
What it is
Testagen is a synthetic tetrapeptide, a short chain of four amino acids (reported as Lys-Glu-Asp-Gly, abbreviated KEDG), belonging to the family of Khavinson short peptide bioregulators developed within the Russian school of gerontology and peptide research. It is handled as a lyophilized (freeze-dried) research powder.
Research context and categorization
Testagen is generally grouped as a peptide bioregulator with a reproductive and endocrine orientation, often described as a "testes" bioregulator within the broader Khavinson bioregulator category. In neutral research terms, it is studied in the context of testicular tissue and the male hypothalamic-pituitary-gonadal axis, and it is commonly discussed in relation to endogenous testosterone biosynthesis and Leydig cell activity. Some laboratory reports from the Khavinson group also discuss it in relation to pituitary and thyroid signaling and to immune-cell differentiation in model systems.
These uses are investigational. Much of the available literature originates from Russian-language sources with limited independent replication in Western settings, and the described effects are not confirmed or approved benefits. Testagen is not an FDA-approved drug, and none of the research-framed uses above should be read as established outcomes.
Status
- Regulatory status: Research-only / not FDA-approved. Testagen has no approved human or veterinary indication and is supplied as a research chemical.
- Sport status: Not specifically listed by name on the WADA Prohibited List. However, because it is studied in relation to stimulating endogenous testosterone production, it could fall under prohibited provisions for hormone and metabolic modulators or peptide hormones. WADA rules also cover substances that are structurally or pharmacologically similar to listed classes even when not named individually, so athletes should treat it as potentially prohibited and confirm current status directly.
Reconstitution notes (general)
Reconstitution concentration is calculated as the milligrams of peptide in the vial divided by the millilitres of bacteriostatic water added. For example, a 20 mg vial brought up with 3 mL of bacteriostatic water yields roughly 6.7 mg/mL, while the same vial with 10 mL yields 2 mg/mL. To work out concentration and syringe measurements for a specific vial and volume, use the calculator at /pages/tools.
Dilution and handling notes (compound-specific)
Testagen ships as a lyophilized powder, so it is reconstituted rather than used as a ready liquid. Vials are commonly offered in the 20 mg range, and typical reconstitution volumes fall between about 2 mL and 10 mL of bacteriostatic water, which puts working concentrations in a broad 2 mg/mL to roughly 6.7 mg/mL band depending on how much water is added. Because KEDG is a very small tetrapeptide carrying charged, hydrophilic side chains (lysine, glutamic acid, and aspartic acid), it is highly water soluble and generally goes into solution readily. Add the water slowly down the inner wall of the vial rather than blasting it onto the powder cake, then let the vial stand and swirl gently; the powder usually clears within a minute or two without heating or vortexing. Unlike larger or more hydrophobic peptides, KEDG does not typically gel or turn stringy when concentrated, so cloudiness or visible particles after mixing is a signal that something is off (contamination, degraded material, or an incompatible diluent) rather than normal behavior. Avoid vigorous shaking, which can foam and denature peptide at the air-liquid interface; a gentle swirl is enough.
Handling and storage
Store the reconstituted vial refrigerated at 2 to 8 degrees Celsius and keep it out of direct light. Wipe the rubber stopper with an alcohol swab before each puncture, and label the vial with the mix date. Treat roughly a 4-week refrigerated window as a general guideline for reconstituted material, and avoid repeated freeze-thaw cycles, which degrade small peptides. Discard anything that turns cloudy or discolored or that shows floaters or particulates.
Related reading
Tools and supplies
- Reconstitution & blend calculators
- Bacteriostatic Water 30 ml
- Gansulin Metal Reusable Pen
- 3 ml Glass Cartridges (10-pack)
- Complete Starter Kit
For laboratory and research reference only. Educational content, not medical, dosing, injection, or therapeutic guidance, and not intended for human or animal use. Any research uses described are investigational and not confirmed or approved benefits. Confirm anything involving health with a licensed professional. References linked above.