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
30 clinically reviewed articles, written and peer-reviewed by the HealthRX.com Medical Team.
30articles
2topic areas covered
May 27, 2026latest review
Supplements Levothyroxine library
Showing 30 of 30 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)?
A physician-reviewed guide covering the pharmacodynamic and pharmacokinetic interactions between ashwagandha and levothyroxine (Synthroid), including dosing windows, TSH monitoring, and when to call your prescriber.
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 clinician-reviewed guide to combining CoQ10 and Synthroid (levothyroxine): pharmacokinetic vs pharmacodynamic interactions, timing, doses, and monitoring advice.
Can I Take Creatine with Synthroid (Levothyroxine)?
A physician-reviewed guide covering the creatine-levothyroxine interaction, creatinine lab interference, dose-separation windows, and monitoring recommendations for hypothyroid patients taking creatine.
Can I Take Folate with Synthroid (Levothyroxine)?
A physician-reviewed 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)?
Evidence-based guide on taking glutathione supplements with Synthroid (levothyroxine). Covers interaction risk, dose-separation timing, liver metabolism effects, and monitoring recommendations.
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 clinician-reviewed 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 supplements can reduce levothyroxine absorption if taken together. Learn the safe dose-separation window, which magnesium forms matter, and how to monitor thyroid levels.
Can I Take Melatonin With Synthroid (Levothyroxine)?
Learn whether melatonin is safe to take with Synthroid (levothyroxine), how the two may interact pharmacodynamically, recommended timing windows, and when to call your prescriber.
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 detailed guide to taking omega-3 fish oil with Synthroid or generic levothyroxine: interaction type, timing, doses, monitoring, and when to call your prescriber.
Can I Take Reishi Mushroom with Synthroid?
A physician-reviewed 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)?
A physician-reviewed guide covering the pharmacokinetic and pharmacodynamic interactions between turmeric/curcumin and levothyroxine (Synthroid), including absorption timing, monitoring thresholds, and safe use protocols.
Can I Take Vitamin B12 with Synthroid (Levothyroxine)?
Evidence-based guide on taking vitamin B12 with Synthroid (levothyroxine). Covers interactions, timing, dose-separation windows, monitoring, and clinical recommendations.
Can I Take Vitamin B6 with Synthroid (Levothyroxine)?
A clinical review of the vitamin B6 and levothyroxine interaction: pharmacokinetics, absorption timing, safe dosing, and monitoring guidance for people on Synthroid.
Can I Take Vitamin D With Synthroid (Levothyroxine)?
A complete clinical guide to taking vitamin D with Synthroid (levothyroxine): interaction mechanisms, timing, dosing, monitoring, and what your prescriber needs to know.
Can I Take Zinc With Synthroid (Levothyroxine)?
Learn whether zinc supplements are safe with Synthroid, how zinc affects levothyroxine absorption, the correct dose-separation window, and what monitoring your doctor should order.
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.