Such may be the case when it comes to antiperspirants. As reported by Real Clear Science,1 antiperspirants affect the bacterial balance in your armpits, leading to an even more foul-smelling sweat problem.

The reason your sweat smells is because the bacteria living in your armpits break down lipids and amino acids found in your sweat into substances that have a distinct odor.

Antiperspirants address this problem using antimicrobial agents to kill bacteria, and other ingredients such as aluminum that block your sweat glands. According to the featured article:

"To uncover how deodorants and antiperspirants affect armpit bacteria… a team of researchers recruited eight subjects for a task a great many people (and especially their friends) might deem unbearable:

Six males and two females pledged not to use deodorant or antiperspirant for an entire month. Specifically, four subjects stopped using their deodorants and another four stopped using their antiperspirant deodorant….