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：在美国，没有无铝止汗剂这种东西。它们被认为是药物，美国食品和药物管理局只批准在止汗剂中使用源自铝的活性成分。