What does a B12 deficiency look and feel like? Symptoms of this include a pale, yellow tinge to the skin and mouth ulcers, according to the NHS.
Other symptoms of a vitamin B12 deficiency, as pointed out by the health body, include irritability, depression and changes in the way you think, feel and behave.
In addition, some people may experience glossitis, which is a sore and red tongue.
“Eating fortified breakfast cereals, yeast extract and meat can help with this,” added Tew.