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.
Vitamin B complex is comprised of eight vitamins, which include B-1, B-2, B-3, B-5, B-6, B-7, B-12 and folate, or B-9. These vitamins help your body produce the energy it needs to function better. The B vitamins assist your body in the formation of red blood cells, which supply oxygen to body tissues.