The Vitamins Your Blood and Brain Can’t Function Without

Human blood is composed of about 55% plasma and 45% formed elements. The formed elements include red blood cells, white blood cells, and platelets. Blood not only transports nutrients but also plays a vital role in preventing blood loss and maintaining life. Red blood cells are continuously produced through a process called erythropoiesis. This process requires several nutrients, including vitamin B6, folate, vitamin B12, iron, and copper. When injury occurs, the body prevents excessive blood loss through mechanisms such as vasoconstriction, platelet plug formation, and blood coagulation.

Vitamin K is essential for proper blood clotting and helps support these protective mechanisms. Good dietary sources of vitamin K include green leafy vegetables, broccoli, asparagus, and peas. Vitamin K deficiency is common in newborns because their intestines are still sterile and lack sufficient bacteria to produce the vitamin. For this reason, a vitamin K injection is routinely given shortly after birth. In adults, deficiency can occur with prolonged use of antibiotics, which can reduce the bacteria that help produce vitamin K.

Folate is essential for DNA synthesis and the metabolism of homocysteine. A deficiency can lead to neural tube defects. Some studies suggest that excessive intake of folic acid supplements, particularly at doses above 40 mg, can promote tumor development. Common dietary sources of folate include green leafy vegetables, organ meats, and orange juice. Vitamin B12 plays a key role in folate metabolism and is essential for maintaining the myelin sheath that insulates neurons. It is also involved in the metabolism of homocysteine. A deficiency can lead to pernicious anemia, an autoimmune condition in which the cells of the stomach that produce gastric acid and intrinsic factor are destroyed. Common dietary sources of vitamin B12 include meat, seafood, and fortified cereals.

Iron is a component of hemoglobin, which transports oxygen and carbon dioxide in the blood. It is also important for brain function, immune response, drug detoxification, and bone health. Iron deficiency anemia is associated with reduced oxygen delivery to tissues. Common signs and symptoms include pale skin, fatigue during physical activity, and poor temperature regulation. Iron status can be assessed using laboratory tests such as hematocrit, hemoglobin, ferritin, and transferrin levels. Excess iron intake may cause gastrointestinal distress and can lead to toxicity, such as hemochromatosis. Dietary sources of iron include cereals, beans, animal products, peas, and other legumes.

Copper acts as a cofactor for superoxide dismutase, an enzyme that protects the body from free radical damage. It also plays a role in energy metabolism, blood health, and neurotransmitter synthesis. Copper deficiency may lead to a form of anemia, weakened immune function, bone loss, poor growth, and increased risk of cardiovascular disease. Excessive intake of copper supplements, particularly a single dose exceeding 10 mg, can cause toxicity. Copper toxicity cannot occur with food. Symptoms may include gastrointestinal distress, vomiting, blood in the stool or black, tarry feces, and damage to the liver and kidneys. Dietary sources of copper include liver, legumes, seeds, whole-grain breads and cereals, and cocoa.

B vitamins play a critical role in blood health and the proper functioning of the nervous system. Deficiency is more commonly due to impaired absorption than to inadequate intake. Therefore, a healthy gut lining, free from pathogens and supported by a balanced microbiome, is important for the effective absorption and utilization of these nutrients.