Short answer: The endothelium is the inner lining of blood vessels that regulates vascular tone. These amino acids are studied for supporting healthy endothelial signaling.
Why "endothelial function," not just "blood flow," is the more precise target
Naming this specific vessel-lining tissue directly gives you a more precise, checkable mechanism than a general "supports circulation" claim.
Why this is described as a targeted focus, not a surface-level approach
Targets the vessel lining that regulates vascular tone, not just a surface-level approach — a direct, specific claim about where the formula's mechanism is aimed.
💡 Worth knowing: endothelial support is listed as its own distinct step among the formula's six stated supporting roles.