Eating or not eating eugenol before the review of thyroid function does not have much effect on the measurement of the results, because eugenol is taken orally one tablet at a time, and only after four weeks of oral thyroid hormone levels will be adjusted to a very stable state, and the results of the measurement will reflect whether the dosage of eugenol is appropriate or not. Clinically, it is also recommended that patients should review their thyroid function every four weeks. Whether or not they take one tablet or any dose of Eugenol before the test does not have much effect on the result, and the result of the test reflects whether or not the oral dose of Eugenol was sufficient and effective within the past month.