Supplementation with l-arginine and nitrates vs age and individual physiological reactivity.

This article focuses on the roles of l-arginine and dietary nitrates in modulating nitric oxide (NO) biosynthesis as supplements to influence ageing and stress-related physiological processes. Ageing is characterized by decreased adaptive capacity and endothelial dysfunction, partly due to reduced NO bioavailability, which affects vascular health and contributes to age-related pathologies such as cardiovascular disease. The review highlights that while l-arginine, an NO synthase substrate, shows potential in improving endothelial function and modulating systemic inflammation, its efficacy may be limited by factors like oxygen dependency and enzyme inhibitors. Conversely, inorganic nitrates and nitrites, derived from diet and gut microbiota, can enhance NO production via oxygen-independent pathways, potentially offering more effective supplementation for older individuals. The article emphasizes the importance of individual physiological reactivity in tailoring such interventions and suggests further research into nitrate supplementation as a promising strategy for preventing premature ageing and vascular dysfunction.