According to Wikipedia these are its uses

Leaves can be eaten raw or cooked. Achillea ptarmica yields an essential oil that is used in herbal medicine. The leaves are used as an insect repellent.^[9][10]

When chewed, the plant produces a numbing, tingling effect in the mouth, comparable to that of Sichuan pepper. For this reason, it is sometimes used in herbal medicine to relieve toothache or ulcers, and as a culinary herb.^[11][12]