Nitric Oxide
Nitric Oxide Supplements for Better Blood Flow: What Actually Works? A Functional Medicine Physician's Take on L-Arginine, L-Citrulline, and Beetroot
But there's no universal "best" supplement. The choice between L-citrulline, beetroot, or a combined approach should be based on your specific goals, health status, and which nitric oxide pathway needs the most support.