Deficiencies can occur when you don’t get enough B-12 from your diet or when your body can’t use it properly. Typically, vitamin B-12 deficiencies can be detected through the vitamin B-12 test.

Folate, or vitamin B9, is an important micronutrient that plays a key role in many aspects of health, including DNA synthesis, red blood cell formation, and fetal growth and development. Folic acid is ...