| UPDATED: 09:38, Wed, Mar 3, 2021
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Speaking exclusively to the Express.co.uk, Dr Dan Bunstone shares his expertise on the symptoms of a vitamin B12 deficiency. In addition, the GP reveals how a diagnosis is made, and what you can do if you're not near your local doctor's surgery. "Vitamin B12 deficiency can cause a wide range of symptoms which tend to develop gradually," said Dr Bunstone. The NHS doctor proceeded to say that "a pale-yellow tinge" of the skin is common; this is known as jaundice.