Thyme is safe in the amounts used in foods and seems safe for most adults when used as medicine.
Special Precautions & Warnings:
Pregnancy and breast-feeding: Not enough is known about the use of wild thyme during pregnancy and breast-feeding. Stay on the safe side and avoid use.
Thyroid disorders: Thyme can slow down the thyroid’s activity, because it can affect hormones that control the thyroid gland. Talk with your healthcare provider if you have thyroid problems and want to start taking thyme.