Too much Estrogen interferes with Thyroid Hormone Progesterone Use Restores Thyroid Function American women and women in developed countries have too much estrogen . This estrogen excess, labeled estrogen dominance by John Lee, M.D., creates hypothyroid symptoms despite normal serum levels of thyroid hormone. Excess estrogen impedes the cellular utilization of thyroid hormone.
Progesterone restores thyroid function in the body.
Low thyroid tends to cause low energy levels, cold intolerance, and weight gain. Excess thyroid causes higher energy levels, feeling too warm, and weight loss. The thyroid gland produces thyroid hormone in two basic flavors T3 and T4. T3 is the more potent of the two. This gland is stimulated in turn by thyrotropin-releasing hormone produced by the hypothalamus, another part of the brain.