Hi
I want to order my dad a full thyroid testing panel +antibodies and vitamins. However,he has previously had low b12 so was taking intramuscular injections until 1 month ago and is now taking the spray. I notice it says to stop taking any b12 for 2 whole weeks before testing. I wondered whether this will benecessary as I worry that it could impact him? Will the b12 injections that he had a month ago be skewing results anyway?
any advice would be appreciated