It is generally assumed that recurrent miscarriage may be due to progesterone deficiency, hypothyroidism or vitamin E deficiency and should be treated in theses cases with progesterone, thyroid extracts and vitamin E respectively. In theory, thyroid therapy appears to be the least well-founded, especially when applied to women without manifest signs of hypothyroidism, yet among the measures mentioned above it is most frequently claimed to have been successful.
Hans Selye