How does vitamin C contribute to immune system function?

Vitamin C plays a significant role in immune system function primarily through its ability to assist in iron absorption. Iron is a critical mineral necessary for the production of hemoglobin, which carries oxygen in the blood and supports the overall function of the immune system.

When iron is better absorbed, it supports the proliferation and function of lymphocytes, which are a type of white blood cell important in the body’s defense mechanism against infections. Additionally, vitamin C itself contributes to immune health by acting as an antioxidant, helping to protect immune cells from oxidative damage, and by enhancing various cellular functions of both the innate and adaptive immune system.

The other options do not accurately represent significant roles related to how vitamin C contributes to immune function. It does not function as a digestive enzyme, nor does it directly increase glucose levels or protein synthesis. Instead, its relationship with iron absorption and immune cell function highlights the importance of vitamin C in maintaining optimal immune health.