I am getting blood tests for selenium, zinc, calcium, parietal and endomysial antibodies.
I don’t supplement any of these currently except for eating high selenium Brazil nuts. Should I stop this before and if so how long?
Is there anything I should be aware of before testing for them in order to get best results? I will stop biotin 7 days before regardless and do them fasting as will be doing thyroid, B12 and iron at same time.
Thanks