SAFE — No Known Interaction
🟢 SAFE — Levothyroxine and Flaxseed can be taken together safely.
Evidence level: LIMITED
Levothyroxine and Flaxseed are generally safe to use together. No adverse interactions have been reported.
No clinically significant interaction between Levothyroxine and Flaxseed has been documented in medical literature.
No dietary interaction between Levothyroxine and Flaxseed. You can consume both without concern.
Critical: Take Levothyroxine on an empty stomach, 60 minutes before eating. Flaxseed — coffee, fiber, soy products, and calcium-rich foods are especially potent at reducing thyroid absorption even when taken 30 minutes apart. The full 60-minute window matters.
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 Flaxseed. 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 discussion needed. Keep your provider informed of your full supplement list.
Safe combination. No dietary restrictions needed. Maintaining a consistent diet helps ensure predictable supplement and medication performance.
Levothyroxine and Flaxseed are generally safe to use together. No adverse interactions have been reported.
Critical: Take Levothyroxine on an empty stomach, 60 minutes before eating. Flaxseed — coffee, fiber, soy products, and calcium-rich foods are especially potent at reducing thyroid absorption even when taken 30 minutes apart. The full 60-minute window matters.
Thyroid medication absorption may be affected by Flaxseed. 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. No dietary restrictions needed. Maintaining a consistent diet helps ensure predictable supplement and medication performance.
No urgent discussion needed. Keep your provider informed of your full supplement list.
Or browse the full interaction database (121,000+ pairs).