Vitamin B12 is vital for a number of functions in the body, including keeping the nervous system healthy.
A deficiency is common in older people and those who follow a plant-based diet.
Symptoms associated with not getting enough B12 are wide-ranging.
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Some of the first signs that levels are low include a tingling sensation in the body’s extremities, due to nerves becoming damaged, the Express reports.
But one simple lip symptom could also mean you're not getting enough of the all-important nutrient.
A Healthline spokesperson said: “Chapped lips are a common symptom of deficiencies, especially in vitamin B9, vitamin B6 and B12".
A deficiency can also cause uncomfortable cracking in the corners of the mouth, according to Maple Dental Hygiene Care.
The health body said: "B Vitamins Deficiency, specifically vitamin B12 can cause cracked lips that have difficulty healing.
“Angular cheilitis is a severe and very uncomfortable lip condition in which cracks and sores are present in the skin at the corners of the mouth when there is B vitamin deficiency.
“Taking B complex vitamins daily helps the body maintain healthily and helps the body cope with daily stress.”
These complications can be put down to the fact that B vitamins can be essential for tissue repair and wound healing.
But cracked lips have wide-ranging causes.
They are common during the winter months because of exposure to cold air and central heating systems.
A vitamin B12 deficiency can be avoided in many people by eating enough bread, cereals and other grains that have been fortified with the nutrient.
Meat, poultry, seafood, dairy products and eggs are also good sources of B12.
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