Several signs of toxicity can occur when a person exceeds the recommended dosage of Vitamin B12.
Vitamin B12 is essential for the nervous system to function as normal and some people may take supplements or injections of the vitamin to deal with a deficiency.
When taken in appropriate doses, vitamin B12 supplements “are generally considered safe”, The Mayo Clinic states.
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It explains: “Your body absorbs only as much as it needs, and any excess passes through your urine.”
Nonetheless, the health site suggests that high doses of vitamin B12, such as those used to treat a deficiency, might cause a number of issues, reports The Express.
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These include a headache, nausea and vomiting, diarrhoea, fatigue or weakness, and a tingling sensation in your hands and feet.
Adults aged 19 to 64 need about 1.5 micrograms a day of vitamin B12.
If you eat meat, fish or dairy foods, you should be able to get enough vitamin B12 from your diet, and are unlikely to need to take supplements.
“However, older adults, vegetarians, vegans and people who have conditions that affect their ability to absorb vitamin B12 from foods might benefit from the use of oral supplements”, according to the Mayo Clinic.
Vitamin B12 injections or nasal spray might be prescribed to treat vitamin B-12 deficiency.
Although you need to be careful about making sure not to exceed the recommended allowance, it is key that people have enough of the vitamin, or a deficiency can occur and cause other unwanted signs.
Vitamin B12 deficiency anaemia is a condition in which your body does not have enough healthy red blood cells, due to a lack of the vitamin.
The NHS says that general symptoms of anaemia may include extreme tiredness, breathlessness, feeling faint and headaches.
You may also notice that you have pale skin, noticeable heartbeats, are hearing sounds coming from inside the body, rather than from an outside source, as well as noticing a loss of appetite and weight loss.
If you have anaemia caused by a vitamin B12 deficiency, you may have other symptoms that affect your behaviour.
The NHS says you may notice irritability, depression, changes in the way you think, feel and behave, and a decline in your mental abilities, such as memory, understanding and judgement.
If you have anaemia caused by a vitamin B12 deficiency, you may have other symptoms, such as a pale yellow tinge to your skin, a sore and red tongue and mouth ulcers.
Others report pins and needles, changes in the way that you walk and move around, and disturbed vision.
You should see a GP if you're experiencing symptoms of vitamin B12 or folate deficiency anaemia, as these conditions can often be diagnosed based on your symptoms and the results of a blood test.
If your deficiency is due to a restrictive diet, you may seek the advice of a nutritionist.
Vitamin B12 deficiency anaemia is more common in people whose families come from northern Europe, according to Johns Hopkins University.
Vitamin B12 supplements are also often recommended for those who are pregnant or follow vegetarian or vegan diets.
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