Kisspeptin

 

A peptide encoded by the KISS1 gene that functions as a key regulator of the hypothalamic–pituitary–gonadal (HPG) axis. It stimulates neurons in the hypothalamus to release gonadotropin-releasing hormone (GnRH), which in turn promotes secretion of luteinizing hormone (LH) and follicle-stimulating hormone (FSH) from the pituitary gland. Through this signaling cascade, kisspeptin plays a central role in reproductive hormone regulation, fertility, and sexual maturation.

 

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PT-141 (Bremelanotide)

 

A synthetic peptide derived from melanocortin analogs that acts as an agonist of melanocortin receptors, particularly MC3R and MC4R, within the central nervous system. Activation of these receptors influences sexual arousal pathways and autonomic nervous system signaling rather than vascular mechanisms. Research indicates PT-141 modulates dopaminergic pathways associated with sexual motivation and arousal.

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Testagen

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A short synthetic peptide bioregulator composed of three amino acids designed to support gene expression within testicular tissue. Experimental studies suggest it may influence protein synthesis and cellular metabolism in the testes, potentially supporting endocrine balance and reproductive tissue function through epigenetic regulatory mechanisms.