Testagen

Testagen peptide known as KEDG is a tetrapeptide consisting of lysine (Lys), glutamic acid (Glu), aspartic acid (Asp), and glycine (Gly), further presented as H–Lys–Glu–Asp–Gly–OH. KEDG represents a bioregulator intended to stimulate and regulate the functions of the endocrine system.^[1]

Testagen is a synthetic, tissue-specific peptide biomodulator. It supports normal testicular cell function and HPG axis signalling. It is neither testosterone nor a testosterone ester or prohormone. Consequently, it does not provide exogenous testosterone and is not a form of direct hormone therapy. It should be noted that Testagen has not been approved by the FDA and is only available in certain hospitals via a doctor’s prescription.

[1] Dobriţescu, A., Samide, A., Cioateră, N., Mic, O. C., Ionescu, C., Dăbuleanu, I., Tigae, C., Spînu, C. I., & Oprea, B. (2025). The Inhibitory Effect and Adsorption Properties of Testagen Peptide on Copper Surfaces in Saline Environments: An Experimental and Computational Study. Molecules, (30) 15. https://doi.org/10.3390/molecules30153141