B12
This test checks for your levels of vitamin B12, which is supplied by animal products (including meat, fish, milk products, and eggs) in the diet, as well as in supplements, fortified foods, and some nutritional yeasts.
Folate
This test checks for folate levels. Folate, or folic acid, is a B vitamin needed for red blood cell production and DNA production and repair. Dietary contributions of folate are found in citrus fruit and dark greens, among other foods. Deficiency may be due to poor dietary intake or absorption, or due to certain diseases or genetic mutations.
Vitamin D
This tests for levels of vitamin D, a vitamin that is found in some foods and also produced through sunlight exposure. This is frequently checked to evaluate for fatigue or depressed mood and is associated with calcium absorption and bone health.
