Other signs of a B12 deficiency include pale or jaundiced skin.
“With less red blood cells in your body, your skin loses some of that colour and looks paler,” Holland and Barrett says.
“The cells are also more fragile, and when a lot of them break down, you can have an excess of bilirubin.
“Your liver produces this when it processes old blood cells. Large amounts of it produce a yellow tinge in your skin and eyes.”