Role of vitamin C in the function of the vascular endothelium 

This review from 2013 covers the use of vitamin c in various salt forms and its impact on vascular health. These functions include increasing the synthesis and deposition of type IV collagen in the basement membrane, stimulating endothelial proliferation, inhibiting apoptosis, scavenging radical species and sparing endothelial cell-derived nitric oxide to help modulate blood flow. 

References:

May JM, Harrison FE. Role of vitamin C in the function of the vascular endothelium. Antioxid Redox Signal. 2013;19(17):2068-2083. doi:10.1089/ars.2013.5205 https://pubmed.ncbi.nlm.nih.gov/23581713/