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Body odor from the armpits comes from bacteria metabolizing sweat produced by the apocrine glands.

Aluminum is often used for this, plugging up perspiration-producing glands called eccrine and apocrine glands, the latter of which are concentrated in the hairy parts of the body.

That’s because there are two types of sweat glands present there: eccrine glands, which sweat out the salty watery stuff discussed above, and apocrine glands, which release a viscous waxy substance.

Then there’s the other kind of sweat, which comes from the larger apocrine glands, located in places like the armpits and the groin.

Mammals have three types of sweat glands: apocrine, sebaceous and eccrine.