Pale or Yellow Skin

Pale skin may indicate a vitamin B12 deficiency and occurs due to a lack of healthy red blood cells. B12 deficiency can also lead to the destruction of immature red blood cells in the bone marrow, which can cause jaundice (yellowing of the skin and whitening of the eyes). Jaundice occurs due to high bilirubin levels (a waste material created when the body breaks down RBCs).

Headaches

One of the most common symptoms of B12 deficiency is headaches. Studies have found that people who experience migraines are more likely to have low B12 levels than people with no migraine history. Further research is needed to determine whether eating foods rich in vitamin B12 or taking supplements can improve headaches.

Fast Heart Rate

People with a B12 insufficiency or deficiency lack enough healthy red blood cells. To make up for this, the heart may beat faster in an attempt to push more blood to the body more quickly and get enough oxygen to reach all the organs.