This is the most common "side effect" with progesterone that doesn't get talked about enough:
"If a person has an enlarged thyroid gland, progesterone promotes secretion and unloading of the stored “colloid,” and can bring on a temporary hyperthyroid state. This is a corrective process, and in itself isn't harmful. A thyroid supplement should be used to shrink the goiter before progesterone is given."
https://raypeat.com/articles/articles/progesterone-summaries.shtml
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