Agmatine (CAS 306-60-5) is an endogenous neurotransmitter modulator, with its core mechanism being the regulation of multiple receptors (e.g., NMDA receptors, α2-adrenergic receptors) and signaling pathways. It participates in physiological processes such as pain regulation, neuroprotection, and emotional homeostasis, while also assisting in regulating cellular energy metabolism, with multi-target biological activity.