YSK: In the United States, there is no such thing as Aluminum-free antiperspirants. They are considered drugs and the FDA has only approved aluminum-derived active ingredients in the use of antiperspirants.
from /r/YouShouldKnow
YSK：在美國，沒有無鋁止汗劑這種東西。它們被認爲是藥物，美國食品和藥物管理局只批准在止汗劑中使用源自鋁的活性成分。