Deodorants and antiperspirants reduce body odor in different ways. Some people prefer deodorants over concerns about aluminum compounds in antiperspirant, though research suggests this isn’t a cause for concern.

Antiperspirants and deodorants work in different ways to reduce body odor. Antiperspirants reduce sweat, while deodorants increase the skin’s acidity.

The Food and Drug Administration (FDA) considers deodorants to be cosmetics: products intended to cleanse or beautify. It considers antiperspirants to be drugs: products designed to treat or prevent disease or affect the structure or function of the body.

Keep reading to learn more about the differences between these two forms of odor control and whether one is better for you than the other.

Deodorants are typically alcohol-based and formulated to eliminate armpit odor but not perspiration. When applied, they turn the skin acidic, making it less attractive to bacteria.

Deodorants also commonly contain perfume to mask odor.

The active ingredients in antiperspirants usually include aluminum-based compounds that temporarily block sweat pores. Blocking sweat pores reduces the amount of perspiration that reaches your skin.

If over-the-counter (OTC) antiperspirants cannot control your sweating, prescription antiperspirants are available.

There are two primary reasons to use deodorants and antiperspirants: moisture and smell.

Moisture

Sweat is a cooling mechanism that helps us shed excess heat. Armpits have a higher density of sweat glands than other areas of the body. Some people wish to reduce their sweating, since armpit sweat can sometimes soak through clothing.

Sweat can also contribute to body odor.

Smell

Your sweat itself doesn’t have a strong odor. It’s the bacteria on your skin breaking down sweat that produce an odor. The damp warmth of your armpits is an ideal environment for bacteria.

The sweat from your apocrine glands — located in the armpits, groin, and nipple area — is high in protein, which bacteria easily break down.

The aluminum-based compounds in antiperspirants — their active ingredients — prevent sweat from reaching the surface of the skin by blocking the sweat glands.

There’s a concern that if the skin absorbs these aluminum compounds, they can affect the estrogen receptors of breast cells.

However, according to the American Cancer Society, there’s no clear link between cancer and the aluminum in antiperspirants because:

  • Breast cancer tissue doesn’t appear to have more aluminum than normal tissue.
  • Only a tiny amount of aluminum is absorbed (0.0012 percent) based on research on antiperspirants containing aluminum chlorohydrate.

Other research indicating that there’s no connection between breast cancer and underarm products includes the following:

  • A 2002 study of 793 women with no history of breast cancer and 813 women with breast cancer showed no increased breast cancer rate for those women who used deodorants and antiperspirants in their armpit area.
  • A smaller-scale 2006 study supported the findings of the 2002 study.
  • A 2016 systematic review concluded that there’s no link between increased breast cancer risk and antiperspirant, but the study also suggested there’s a strong need for further research.

Antiperspirants and deodorants work in different ways to reduce body odor. Antiperspirants reduce sweat, and deodorants increase skin acidity, which odor-causing bacteria don’t like.

While there are rumors linking antiperspirants to cancer, research suggests that antiperspirants don’t cause cancer.

However, studies also recommend that further research is needed to study the potential link between breast cancer and antiperspirants.