Vitamin B12 is used by the body to make red blood cells, which transport oxygen around the body, according to the NHS.
The vitamin is also used to keep the nervous system healthy, and even helps with the production of DNA.
Making sure you get enough vitamin B12 in your diet is crucial, as the condition increases the risk of memory loss, loss of physical co-ordination, or even damage to the nervous system.
You may be at risk of a vitamin B12 deficiency if your tongue feels tingly.
The tongue may feel slightly different from normal if you have a B12 deficiency, warned physician Dr Joseph Mercola.
It’s caused by changes to the senses on the tongue, he said.
These changes could also make the tongue feel tender or numb.
“Vitamin B12 and iron are needed to mature papillae on the tongue.
“If you are deficient in those vitamins, you lose those papillae, which can make your tongue appear very smooth.
“A vitamin B12 deficiency may also cause sensory changes on your tongue as the vitamin is crucial for the proper neurological function of your taste buds.
“This may result in feelings of tingling, burning sensations, tenderness or numbness in the absence of any specific lesions.
“This condition has been found more frequently in middle-aged and elderly women who also experience altered taste sensation and dry mouth.”
The tongue may also become inflamed, making it appear smoother than normal.
Tongue inflammation, which is known as glossitis, can be painful, and may change the way you speak or eat.
Mouth ulcers or an itchy sensation in the mouth could be caused by a vitamin B12 deficiency.
Speak to a doctor if you’re experience the signs of a vitamin B12 deficiency, said the NHS.
The GP could diagnose the condition based on a quick blood test.
It’s crucial to diagnose the condition early, as some symptoms may become irreversible if left untreated.
To top up on vitamin B12, add more beef, clams or sardines to your diet.
All UK adults need about 1.5mcg of vitamin B12 everyday.