Sir
Colour of any body part is due to a pigment called melanin , synthesis of which requires copper as mineral so essentially copper deficiency is the reason behind greying of hair.
And minerals do not work alone, for any optimal function it is balance of various minerals.
Premature greying of beard is not due to
vitamin b12 deficiency.
But since your levels of b12 vit d are low you definitely need supplementation, the dose and duration to be decided by your doctor.
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