25 source-based articles maintained by the HealthRX.com Editorial Team.
Showing 25 of 25 clinical reviews.
Alpha-lipoic acid can reduce levothyroxine absorption and lower thyroid hormone levels. Learn the mechanism, dose-separation rules, and monitoring steps before combining ALA with Synthroid.
Can you take ashwagandha with levothyroxine? Only with physician approval and TSH monitoring. Ashwagandha may raise T3 and T4 levels and amplify your dose.
Learn whether caffeine is safe with Synthroid, how it affects levothyroxine absorption, and what timing strategies doctors recommend for hypothyroid patients who drink coffee or take caffeine supplements.
Calcium supplements reduce levothyroxine absorption by up to 39%. Learn the exact timing window, which calcium forms are worst, and how to monitor your TSH after changing your supplement schedule.
A guide to combining CoQ10 and Synthroid (levothyroxine): pharmacokinetic vs pharmacodynamic interactions, timing, doses, and monitoring advice.
Creatine and levothyroxine have no direct interaction, but creatine raises serum creatinine, which can skew kidney labs. Tell your prescriber before labs.
A guide on taking folate with Synthroid (levothyroxine): interaction mechanisms, dose-separation windows, MTHFR considerations, monitoring recommendations, and clinical safety evidence.
A board-reviewed guide covering the pharmacokinetic and pharmacodynamic interactions between ginseng and levothyroxine (Synthroid), with dosing windows, monitoring advice, and what to do if you are already taking both.
What is known and what remains unproven about combining glutathione supplements with Synthroid (levothyroxine): absorption timing, metabolism theory, and what to verify with a pharmacist or prescriber.
Glycine is generally safe to take with levothyroxine (Synthroid) if dosed 4+ hours apart. Learn the pharmacokinetic interaction risk, absorption timing, monitoring steps, and clinical guidance.
Green tea extract and EGCG may reduce levothyroxine absorption and raise liver-toxicity risk at high doses. Learn the mechanisms, safe timing, dose limits, and when to call your prescriber.
Learn whether L-theanine is safe to take with Synthroid (levothyroxine), how each substance works, what the evidence says about interactions, and how to time your doses safely.
A guide to the lion's mane and Synthroid interaction: mechanisms, timing, monitoring, and when to call your prescriber.
The American Thyroid Association recommends separating levothyroxine and magnesium by at least 4 hours; magnesium binds T4 in the gut and raises your TSH.
What is established, what is plausible but unproven, and what remains unverified about combining melatonin with Synthroid (levothyroxine) for hypothyroidism, including timing and monitoring guidance.
Evidence-based guide on taking NAC with levothyroxine (Synthroid). Covers interaction mechanisms, dose-separation timing, monitoring labs, and safety data for hypothyroid patients.
A clinically grounded guide to combining omega-3 fish oil with Synthroid or generic levothyroxine: what is established about the interaction, what is only plausible, what remains unverified, and when to loop in your prescriber.
A guide to the reishi mushroom and levothyroxine (Synthroid) interaction, covering mechanism, timing, monitoring, and clinical recommendations.
Find out whether resveratrol is safe to take with Synthroid (levothyroxine), how any interaction works, what the clinical evidence shows, and how to protect your thyroid levels if you choose to combine them.
Evidence-based guide on taking saw palmetto with Synthroid (levothyroxine). Covers interaction mechanisms, dose-separation timing, monitoring recommendations, and safety considerations.
St. John's Wort reduces levothyroxine blood levels by inducing CYP enzymes and P-glycoprotein, raising TSH and worsening hypothyroid symptoms. Learn the mechanism, risks, monitoring approach, and what to do if you are already taking both.
B12 and levothyroxine have no known interaction, so you can take both. Just take levothyroxine on an empty stomach 30 to 60 minutes before your B12 dose.
Yes, vitamin D and thyroid medication can be taken together, no direct interaction. Separate levothyroxine and vitamin D doses by at least four hours.
How zinc supplements interact with Synthroid (levothyroxine): the absorption mechanism, the dose-separation window clinicians recommend, what is actually proven versus plausible, and what to ask your prescriber or pharmacist.
Quercetin may interfere with levothyroxine absorption through OATP transporter inhibition. Learn the mechanism, dose-separation strategy, and TSH monitoring plan.