Hello and welcome to HCM,
Vegetarians are prone to have vitamin B 12 deficiency.
Vitamin B 12 supplements can be taken regularly.
It will keep the B12 levels within normal range.
A fall in white blood cell
is most commonly caused by infections.
A differentiation leukocyte count (DLC) will determine the component which if low.
Further management will depend on the result of the investigations.
Thanks and take care
Dr Shailja P Wahal