I have read that you shouldn't take TF if you have an autoimmune disorder. I have Hashimoto's Hypothyroidism, which is an autoimmune disease and the most common type of hypothroidism found in the US. I also have autonomic dysfunction (neurally mediated hypotension) and other conditions which my doctor feels is caused by autonomic dysfunction. He treats diabetics all the time (he is an endocrinologist) and sees nerve damage all the time. He thinks CFS is nerve damage caused by an overactive immune system. Would Transfer Factor by safe for me? I could only afford the cheaptest in price? Thanks for your input.