Antiperspirant or Deodorant: What's the Difference?

You have a drawer of them. Natural ones with baking soda, one that promises 48 hours, one from a friend’s recommendation that gave you a rash. Each one says it controls odor, and you still smell it by 3 p.m.

Picking by problem

Wet, but not especially smelly. You want an antiperspirant. Cleveland Clinic¹ says it works on the sweat itself.

Smelly, but not especially wet. A deodorant covers odor, per Cleveland Clinic¹. If the smell lingers after you’ve washed, see our article on smelling even after a shower.

Both. Cleveland Clinic¹ suggests an antiperspirant at night and a deodorant in the morning.

How to use an antiperspirant so it works

Cleveland Clinic¹ says to apply it at night when your sweating is at a minimum, so the product stays in place for six to eight hours before you wash it off in the morning. You can use a deodorant in the morning.

If your underarms are irritated, Cleveland Clinic¹ says not to apply right after shaving, because already irritated skin can develop irritant contact dermatitis, a rash from a product. Both products can irritate. If a product stings or leaves a rash, switch rather than push through. See dry, itchy skin.

What if it isn’t enough

The NHS² says to try stronger antiperspirants instead of deodorant, which you can buy without a prescription, plus loose-fitting clothes and sweat shields to protect your clothing. It advises against tight clothes and synthetic fabrics like nylon. Heavy sweating that these don’t touch may be hyperhidrosis. See what hyperhidrosis is for the medical options, and sweating under the breasts for other spots.

The breast cancer question

You’ve probably seen the warning. The National Cancer Institute (NCI)³ says no scientific evidence links the use of antiperspirants or deodorants to breast cancer. It describes a 2002 study of more than 1,600 women that showed no increase in risk, even with shaving, and says a 2014 review found no clear evidence. It notes that one 2003 study reported younger diagnosis ages among frequent users, but calls those results not conclusive.

On ingredients, the NCI³ says aluminum compounds and parabens have been studied for hormonal effects, but no studies to date have confirmed substantial adverse effects of aluminum that contribute to breast cancer risk. Cleveland Clinic¹ agrees that research hasn’t established that aluminum causes breast cancer.

The play

Try this: a two-week product test

Pick one antiperspirant. Apply it to clean, dry skin at bedtime, and a deodorant in the morning if you want one.

Skip applying right after shaving.

Note how you feel by 3 p.m. each day. If wetness is the main issue and you’ve tried a stronger antiperspirant, ask a clinician about it.

When to get checked

Book an appointment if any of these fit:

• A product causes a rash, burning or blisters
• Sweating is heavy even with a stronger antiperspirant
• Sweating is new, or mostly at night

A drawer full of failed products isn’t a hygiene failure. It’s usually a mismatch between the product and the problem.