Vitamin B12 deficiency symptoms can develop if one does not get enough B12 from the foods they eat. Vegans and vegetarians may not have B12 in their diets because the best sources of vitamin A are from animal foods. Certain medical conditions can also affect the absorption of B12 from food by humans, such as pernicious anemia. Vitamin B12 is vital for the production of red blood cells and helps maintain nerve health.
If a person lacks B12, their red blood cell count may be lower and their nerves may be damaged.
Left untreated, vitamin B12 deficiency can begin to affect human movement and increase the risk of heart problems.
And how can you spot a vitamin B12 deficiency?
You may be at risk of condition if you notice your hair is gray according to studies.
Low levels of Vitamin B12 have been found to be common in participants with premature hair grays, along with low levels of serum ferritin that stores iron in the body and good cholesterol.
A 2015 report published in the Journal of Development notes various deficiency studies, including vitamin b12 deficiency, and a link to hair graying.
Nutritional deficiencies have been found to affect pigmentation, suggesting that the color may return with the vitamin supplement.
Of course, vitamin B12 deficiency is not always the cause of gray hair.
Gray hair is also an inevitable part of aging and by the age of 30 most people have several gray hairs.
Genetics can play a big factor when one turns black. Other Symptoms Of Vitamin B12 Deficiency appetite
The health organization adds: "If you have vitamin B12 deficiency anemia, you may also look pale or jaundice (have a yellowish tinge to the skin and whites of the eyes).
"Like the symptoms of anemia, Vitamin B12 deficiency can cause related nerve symptoms. This is called vitamin B12 neuropathy. This can affect your movement and sensation, especially at your feet, lead to numbness or pins and needles, and reduce your sensitivity to touch, vibration or pain. It can also cause confusion, depression, poor concentration and forgetfulness.
"These symptoms are not always due to Vitamin B12 deficiency anemia, but if you have one, see your doctor."
Vitamin B12 Deficiency Treatment  If a person does not receive enough vitamin B12 from the diet his, he may be advised by the doctor to eat more vitamin B12 enriched foods or to take supplements regularly.
Injections of vitamin B12 may also be recommended and injections may be required for those with pernicious anemia for the rest of their lives.
Experts say adults 19 to 64 years old require about 1.5 micrograms (mg) per day of vitamin B12, and unless you have pernicious anemia, you should be able to
if the vitamin B12 deficiency is triggered, not including enough B12 foods in the diet, Harvard Health Publishing, part of Harvard Medical School, offers a B12 Food List on its website.