This peptide, Angiotensin I/II (3-7), is primarily used in research settings to study the renin-angiotensin system (RAS), which plays a critical role in regulating blood pressure and fluid balance. It is often employed to investigate the biological activities and mechanisms of angiotensin fragments, particularly their potential antihypertensive and cardioprotective effects on cardiovascular and renal functions. Researchers use it to explore its roles in blood pressure modulation, vasodilation, tissue protection (e.g., cardiac recovery after ischemia), and inhibition of angiotensin II-induced vasoconstriction. Additionally, it serves as a tool to understand the degradation pathways of angiotensin peptides and their physiological impacts, contributing to advancements in cardiovascular disease research and therapeutic development. Clinical applications remain in early research stages, requiring further studies to confirm efficacy and safety.