Can I take Calcium Carbonate with Levothyroxine?
Applies to calcium carbonate with oral levothyroxine tablets or capsules, with direct label evidence from levothyroxine-sodium tablets.
Read the interaction guide →Medication overview
Levothyroxine: Supplement Interactions
Find the available answers about levothyroxine and supplements. Each guide explains its evidence and the forms it covers.
Supplement combinations
13 published guides. Coverage is limited to the combinations listed.
Can I take Iron with Levothyroxine?
Evidence concerns oral levothyroxine tablets, principally with ferrous sulfate; injectable levothyroxine is outside this finding.
Read the interaction guide →Can I take St. John's Wort with Levothyroxine?
Applies to systemic levothyroxine replacement, with the supporting product evidence centered on oral preparations.
Read the interaction guide →Can I take Kelp Products with Levothyroxine?
The selected entry groups Laminaria/Ecklonia thallus terminology and does not identify a single species, extract or iodine dose. Evidence below concerns iodine-containing seaweed products, with no confirmed exact-product interaction study.
Read the interaction guide →Can I take Vitamin C with Levothyroxine?
Oral vitamin C with oral levothyroxine in selected patients with poor control or high dose requirements. Findings do not establish a benefit for all treated patients, every vitamin-C formulation or intravenous vitamin C.
Read the interaction guide →Can I take Magnesium with Levothyroxine?
Oral levothyroxine tablets with oral magnesium products. The label specifically addresses magnesium-containing antacids; the trial tested dissolved aspartate and citrate. It did not test glycinate, all capsules or injected thyroid hormone.
Read the interaction guide →Can I take Biotin with Levothyroxine?
Applies to affected thyroid immunoassays regardless of how levothyroxine is administered; it is a test-interference issue.
Read the interaction guide →Can I take Fiber with Levothyroxine?
Oral levothyroxine with dietary fiber or oral fiber supplements. Wheat bran, psyllium and calcium polycarbophil have different evidence and are not interchangeable exposures.
Read the interaction guide →Can I take Ferrous Sulfate with Levothyroxine?
Applies to iron (II) sulfate, also called ferrous sulfate, with oral levothyroxine tablets or capsules.
Read the interaction guide →Can I take Calcium with Levothyroxine?
Evidence concerns oral levothyroxine tablets with calcium carbonate, citrate or acetate; it does not apply to injected levothyroxine.
Read the interaction guide →Can I take Grapefruit with Levothyroxine?
Grapefruit juice with oral levothyroxine tablets. Evidence must not be transferred automatically to grapefruit seed extract, peel extracts or an unspecified Citrus paradisi supplement.
Read the interaction guide →Can I take Soy with Levothyroxine?
Soy-derived oral foods and supplements with oral levothyroxine. Protein drinks, soy-based infant formula and isolated isoflavones are distinguished; Glycine max alone does not identify the preparation.
Read the interaction guide →Can I take Multivitamins with Levothyroxine?
Applies to mineral-containing multivitamins with oral levothyroxine tablets or capsules; the actual formula controls applicability.
Read the interaction guide →A supplement missing from this list has not been cleared for use with the medication. These pages do not assess every product, formulation, or combination.
Publication status, clinical review and change history are shown in each interaction guide.