Can I Take 5-HTP with Synthroid (Levothyroxine)?
Clinical guide to combining 5-HTP supplements with Synthroid (levothyroxine). Covers interaction mechanisms, dose-separation timing, serotonin risks, and monitoring recommendations.
Supplements Levothyroxine
29 source-based articles maintained by the HealthRX.com Editorial Team.
29articles
2topic areas covered
May 27, 2026latest review
Supplements Levothyroxine library
Showing 29 of 29 clinical reviews.
Can I Take Alpha-Lipoic Acid with Synthroid (Levothyroxine)?
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 I Take Ashwagandha With Synthroid (Levothyroxine)?
Can you take ashwagandha with levothyroxine? Only with physician approval and TSH monitoring. Ashwagandha may raise T3 and T4 levels and amplify your dose.
Can I Take Berberine with Synthroid? What the Evidence Shows
Berberine may interfere with levothyroxine (Synthroid) absorption and metabolism. Learn about the interaction mechanism, safe dose-separation windows, and monitoring recommendations.
Can I Take Caffeine with Synthroid (Levothyroxine)?
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.
Can I Take Calcium with Synthroid (Levothyroxine)?
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.
Can I Take CoQ10 with Synthroid (Levothyroxine)?
A guide to combining CoQ10 and Synthroid (levothyroxine): pharmacokinetic vs pharmacodynamic interactions, timing, doses, and monitoring advice.
Can I Take Creatine with Synthroid (Levothyroxine)?
Creatine and levothyroxine have no direct interaction, but creatine raises serum creatinine, which can skew kidney labs. Tell your prescriber before labs.
Can I Take Folate with Synthroid (Levothyroxine)?
A guide on taking folate with Synthroid (levothyroxine): interaction mechanisms, dose-separation windows, MTHFR considerations, monitoring recommendations, and clinical safety evidence.
Can I Take Ginseng with Synthroid (Levothyroxine)?
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.
Can I Take Glutathione with Synthroid (Levothyroxine)?
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.
Can I Take Glycine with Synthroid? Interaction Risk, Timing, and What the Evidence Shows
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.
Can I Take Green Tea Extract (EGCG) with Synthroid (Levothyroxine)?
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.
Can I Take L-Theanine with Synthroid (Levothyroxine)?
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.
Can I Take Lion's Mane with Synthroid (Levothyroxine)?
A guide to the lion's mane and Synthroid interaction: mechanisms, timing, monitoring, and when to call your prescriber.
Can I Take Magnesium With Synthroid (Levothyroxine)?
Magnesium can bind levothyroxine in the gut and reduce its absorption. Separating the two doses by several hours is the standard precaution; here is what is established, what is plausible, and what still needs verification.
Can I Take Melatonin With Synthroid (Levothyroxine)?
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.
Can I Take N-Acetylcysteine (NAC) with Synthroid (Levothyroxine)?
Evidence-based guide on taking NAC with levothyroxine (Synthroid). Covers interaction mechanisms, dose-separation timing, monitoring labs, and safety data for hypothyroid patients.
Can I Take Omega-3 (EPA/DHA) with Synthroid (Levothyroxine)?
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.
Can I Take Reishi Mushroom with Synthroid?
A guide to the reishi mushroom and levothyroxine (Synthroid) interaction, covering mechanism, timing, monitoring, and clinical recommendations.
Can I Take Resveratrol with Synthroid (Levothyroxine)?
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.
Can I Take Rhodiola with Synthroid (Levothyroxine)?
Evidence-based guide on taking rhodiola rosea with levothyroxine (Synthroid). Covers interaction mechanisms, dose-separation timing, monitoring, and clinical precautions.
Can I Take Saw Palmetto with Synthroid (Levothyroxine)?
Evidence-based guide on taking saw palmetto with Synthroid (levothyroxine). Covers interaction mechanisms, dose-separation timing, monitoring recommendations, and safety considerations.
Can I Take St. John's Wort with Synthroid (Levothyroxine)?
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.
Can I Take Turmeric or Curcumin With Synthroid (Levothyroxine)?
Turmeric and curcumin supplements are generally compatible with levothyroxine, but curcumin can plausibly reduce levothyroxine absorption if taken at the same time. Separating doses by several hours and rechecking TSH after starting a high-dose curcumin product is the prudent approach while direct human interaction data remain limited.
Can I Take Vitamin B12 with Synthroid (Levothyroxine)?
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.
Can I Take Vitamin D With Synthroid (Levothyroxine)?
Yes, vitamin D and thyroid medication can be taken together, no direct interaction. Separate levothyroxine and vitamin D doses by at least four hours.
Can I Take Zinc With Synthroid (Levothyroxine)?
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.
Can You Take Quercetin with Synthroid (Levothyroxine)?
Quercetin may interfere with levothyroxine absorption through OATP transporter inhibition. Learn the mechanism, dose-separation strategy, and TSH monitoring plan.