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Taken together, the researchers concluded that thyroid function may affect mast cells, and that mast cell degranulation could affect thyroid function.[ref] In patients with autoimmune thyroid disease, mast cells infiltrate the thyroid gland and then degranulate.[ref] Animal studies show that hypothyroidism (low thyroid hormone levels) increases the number of mast cells by up to 4.5-fold

First, when you take a pill, it has to be digested and metabolized through the liver or kidney through what is called the first-pass effect

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