Angiotensin II 5-valine is primarily used in research and clinical studies to understand its role in regulating blood pressure and fluid balance. It acts as a potent vasoconstrictor, making it valuable in studying cardiovascular physiology and hypertension. This compound is often utilized in laboratory experiments to investigate the renin-angiotensin system and its impact on vascular and renal functions. Additionally, it serves as a reference standard in pharmacological studies to develop and test antihypertensive drugs. Its application extends to exploring mechanisms of angiotensin receptor signaling and potential therapeutic interventions for cardiovascular diseases.