What is a major role of Folic acid in the body?

Folic acid, also known as vitamin B9, plays a critical role in DNA and RNA synthesis, making it essential for cellular division and growth. This is particularly important in rapidly dividing cells, such as those found in the bone marrow and during periods of rapid growth like pregnancy. Through its involvement in the synthesis of nucleic acids, folic acid helps ensure that genetic information is accurately replicated and maintained in all cells.

While the other options highlight important biological processes, they do not capture the primary function of folic acid. For example, while folic acid does contribute to the formation of red blood cells, this effect is indirect—primarily through its role in DNA synthesis in the bone marrow. Calcium absorption and collagen production are not significant functions of folic acid, as other vitamins and minerals play more direct roles in those processes. Thus, the focus on DNA and RNA synthesis clearly emphasizes the core function of folic acid in supporting cellular integrity and function.