Vitamin A supports the functions of several organs, including your:
Kidneys
Heart
Lungs
Vitamin A is also vital for your immune system, vision and reproductive system. People with cystic fibrosis are more likely than others to have a vitamin A deficiency. The daily recommended amount of vitamin A depends on several things, including your age and whether you are pregnant or breastfeeding. Consult your doctor before adding a vitamin A supplement to your diet.