Vitamins in blood
Vitamins belong in the same way as elements amino acids and fatty acids to the essential elements human beings need to be able to function well and that a human being is unable to produce from food. Vitamins are crucial parts or many kinds or biochemical conversions in the body, such as co-factors in enzyme reactions. Deficiency or excess of vitamins can lead to a decreased function of several (organ) systems and the human body as a whole.

Testing for vitamins in blood can provide insight into absolute and relative deficiencies. The test can be used for diagnostic or preventive purpose. The test also can give insight into the effect of dietary changes/supplementation.
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