Thyrotropin-releasing hormone (TRH) is an endogenous tripeptide amide that acts as a neurotransmitter and neurohormone. TRH regulates hypothalamic-pituitary-adrenal (HPA) and estrogenic signaling pathways. TRH exhibits immunomodulatory and neuroprotective activities. TRH prevents oxidative stress, caspase-mediated apoptosis, glutamate toxicity, and neuroinflammation. Additionally, TRH stimulates epidermal regeneration in ex vivo models, activating would healing. TRH activates the TRH receptor.