Most plant-based milks are not fortified with iodine. “Adequate dietary iodine is required for normal thyroid function.” In fact, the two thyroid hormones are named after how many iodine atoms they contain: T3 and T4. “Given that iodine is extensively stored in the thyroid gland itself, it can safely be consumed intermittently,” so we don’t need to consume it every day. However, our overall diet does need a good source of it. Unfortunately, the common sources aren’t particularly health-promoting: iodized salt and dairy foods. (Iodine-based cleansers like betadine are used on cows “to sanitize...

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