This product is not intended to diagnose, treat, cure, or prevent any disease. These statements have not been evaluated by the Food and Drug Administration.
Melissa officinalis
Moderate· moderate-evidence
May be possible under supervision — talk to your prescriber or pharmacist before combining.
Lemon balm may interfere with thyroid hormone production and activity, potentially reducing thyroid medication effectiveness.
Rosmarinic acid in lemon balm may inhibit TSH binding to thyroid receptors and reduce thyroid hormone synthesis.
Source: Natural Medicines Database · Reviewed April 2026
Lemon Balm + Thyroid medications (Levothyroxine): use caution. May be possible under supervision — talk to your prescriber or pharmacist before combining. Lemon balm may interfere with thyroid hormone production and activity, potentially reducing thyroid medication effectiveness.
Rosmarinic acid in lemon balm may inhibit TSH binding to thyroid receptors and reduce thyroid hormone synthesis.
Do not stop either abruptly on your own. Talk to your prescriber or pharmacist promptly — bring this page to your appointment.
Educational information only — not medical advice. Always verify with a healthcare professional.