Protirelin (TRH) is a synthetic thyrotropin-releasing hormone, a tripeptide that plays a key role in regulating thyroid-stimulating hormone (TSH) and prolactin release. It is widely studied in endocrine and neuropeptide research for its effects on hormonal signaling and metabolic regulation. https://chemdope.com/product/protirelin-trh-peptide-5mg-10mg/