SAFE — No Known Interaction
🟢 SAFE — Levothyroxine and Iodine can be taken together safely.
Evidence level: LIMITED
Levothyroxine and Iodine are generally considered safe to use together based on current medical evidence. No adverse interactions have been reported.
No clinically significant interaction between Levothyroxine and Iodine has been identified in medical literature or FDA drug labeling.
No interaction documented between Levothyroxine and Iodine. Always inform your healthcare provider about all supplements you take.
Critical spacing: Iodine binds to thyroid medication and can reduce absorption by 40% or more. Take Levothyroxine on an empty stomach first thing in the morning. Wait at least 4 hours before taking Iodine. Calcium, iron, and magnesium are the biggest offenders.
Higher risk for: elderly with cardiac conditions, those with adrenal insufficiency, recent thyroid dose adjustments, concurrent calcium/iron/antacid use (absorption interference), or narrow therapeutic index sensitivity.
Thyroid medication absorption may be affected by Iodine. Watch for signs of reduced thyroid medication effectiveness: increased fatigue, weight gain, feeling cold, constipation, dry skin, hair thinning, or brain fog. Conversely, if the interaction boosts absorption: nervousness, rapid heartbeat, weight loss, tremors, or heat intolerance. Take thyroid medication on an empty stomach, at least 30-60 minutes before other supplements. When to seek emergency help: Chest pain, very rapid or irregular heartbeat, severe shortness of breath, or signs of thyroid storm (high fever, extreme agitation, racing heart).
No urgent need to discuss, but always keep your doctor informed of your full supplement and medication list. Say: "I take Levothyroxine and Iodine — is that OK?"
Safe combination. Mineral absorption tip: take calcium and iron at separate times (they compete for absorption). Magnesium is best taken in the evening. Zinc pairs well with meals to prevent nausea. Vitamin C enhances iron absorption.
Levothyroxine and Iodine are generally considered safe to use together based on current medical evidence. No adverse interactions have been reported.
Critical spacing: Iodine binds to thyroid medication and can reduce absorption by 40% or more. Take Levothyroxine on an empty stomach first thing in the morning. Wait at least 4 hours before taking Iodine. Calcium, iron, and magnesium are the biggest offenders.
Thyroid medication absorption may be affected by Iodine. Watch for signs of reduced thyroid medication effectiveness: increased fatigue, weight gain, feeling cold, constipation, dry skin, hair thinning, or brain fog. Conversely, if the interaction boosts absorption: nervousness, rapid heartbeat, weight loss, tremors, or heat intolerance. Take thyroid medication on an empty stomach, at least 30-60 minutes before other supplements. When to seek emergency help: Chest pain, very rapid or irregular heartbeat, severe shortness of breath, or signs of thyroid storm (high fever, extreme agitation, racing heart).
Safe combination. Mineral absorption tip: take calcium and iron at separate times (they compete for absorption). Magnesium is best taken in the evening. Zinc pairs well with meals to prevent nausea. Vitamin C enhances iron absorption.
No urgent need to discuss, but always keep your doctor informed of your full supplement and medication list. Say: "I take Levothyroxine and Iodine — is that OK?"
Or browse the full interaction database (121,000+ pairs).