Well texas hit it.
Vascular system- arginine, agmatine, citrulline. Most non stim pump formulas in working out will help.
Cialis- blood flow
Adequate protein, amino, vitamins.
If you're asking for more extreme aids.
Peptides such as bpc-157 and tb-500 support healing and angiogenisis.
Ghk-cu= collagen synthesis
Any of the growth hormone based peptides.
Maintaining adequate levels of testosterone.
Then you obviously have all your super foods and antioxidants.
Like Texas said this would be an extensive list. Depending on what exactly you're going for look into some of these. But don't just start injecting yourself with peptides and test until you know what you're doing