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Care must be taken with regard to using these supplements, which include calcium, iron, and soy (including soy protein powders and soy isoflavones - found in some menopause supplements) (which can affect absorption of thyroid hormone drugs), alpha-lipoic acid (which may lower levels of thyroid hormone T3 and increase levels of TSH) and L-carnitine and acetyl-l-carnitine (which can inhibit the activity of thyroid hormones - and may help people with hyperthyroidism, or overactive thyroid).Īntacids containing aluminum hydroxide and magnesium hydroxide (such as Maalox) should be taken at least four hours before or after taking levothyroxine, as they may delay or prevent the absorption of the drug ( Synthroid Prescribing Information 2017).
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Levothyroxine (Synthroid, Levoxyl), liothyronine (Cytomel), and other thyroid hormone drugs for hypothyroidism (underactive thyroid), can be affected by taking supplements and can affect your ability to absorb certain vitamins and minerals.