Vitamin B12 deficiency causes a string of symptoms and some can remain even though your lab results come back normal

Vitamin B12 deficiency can leave people feeling shattered with a string of other symptoms . From brain fog and poor concentration to irritability and pins and needles, a lack of the key vitamin can lead to them all .

But what happens if you take a B12 test and it comes back normal yet you still have the symptoms. Expert, Apollo Delhi surgeon Dr Anshuman Kaushal, says there could be an easy answer, yet it is one which is often missed.

Speaking on an Instagram video he says the problem could be a sign of functional B12 deficiency. This is where the body has enough B12 circulating in the blood but its cells cannot use it effectively.

Most routine tests only look at th

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