They fix nitrogen from dinitrogen (N2) in the air using the enzyme nitrogenase, in order to provide the cells in the filament with nitrogen for biosynthesis. Nitrogenase is inactivated by oxygen, so the heterocyst must create a microanaerobic environment.
Vitamin B12 is an especially important vitamin for maintaining healthy nerve cells, and it helps in the production of DNA and RNA, the body's genetic material. Vitamin B12 works closely with vitamin B9, also called folate or folic acid, to help make red blood cells and to help iron work better in the body.
There are several types of vitamin B; these include vitamin B1, B2, B3, B5, B6 and B12. Vitamin B is a water soluble vitamin. The function of the B vitamins include: 1  brain function (vitamin B1). 2  nerve health (vitamin B5 & B6). 3  skin health (vitamin B3). 4  eye health (vitamin B2). 5  formation of red blood cells (vitamin B12).