Function

• One of the main functions of nitric oxide is to relax smooth muscle tissue, which sends a signal to blood vessels to relax and dilate.
  
  

Coenzyme Q10

• An enzyme called Coenzyme Q10, or CoQ10, helps the body produce nitric oxide. Many health food stores sell supplements of CoQ10, and studies have shown that this supplement may help naturally relax blood vessels.
  
  

L-arginine

• L-arginine is an amino acid that can be taken as a supplement as a natural way to relax blood vessels.
  
  

Vitamins

• The antioxidant range of vitamins, especially C and E, help maintain healthy functioning in muscles and blood vessels. Taking a daily dose of vitamins C and E can help keep blood vessels relaxed.
  
  

Considerations

• Though all of the supplements mentioned in this article are natural, you should always check with a medical professional before treating yourself or taking supplements for a medical condition.