Tarragon is an herb. The parts of the tarragon plant that grow above the ground are used to make medicine. Some people call tarragon "mugwort". Be careful not to confuse tarragon with another plant called mugwort (Artemisia vulgaris).
 
Tarragon is used for indigestion (dyspepsia), poor appetite, nausea and vomiting after surgery, toothache, sleep problems, and other conditions,
 
Tarragon is low in calories and carbs and contains nutrients that may be beneficial for your health.
Just one tablespoon (1.8 grams) of dried tarragon leaves provides (2Trusted Source, 3Trusted Source):
Calories: 5
Carbs: 1 gram
Manganese: 6% of the Daily Value (DV)
Iron: 3% of the DV
Potassium: 1% of the DV