Do Zinc Oxide Socks Reduce Foot Odor?What Two Trials Found

An antibacterial sock can be tested for several jobs: preventing a skin infection, reducing an odor rating or making odor less disruptive to daily life. Two studies of zinc oxide nanoparticle-coated socks illustrate why those results need separate labels.¹²

They concern a particular coating and study preparation. “Antibacterial,” “silver,” “copper” and “zinc oxide” are not interchangeable descriptions of the tested socks.

The prevention trial lasted 14 days

A double-blind randomized trial published in 2021 enrolled 148 naval cadets, assigning 74 to coated socks and 74 to uncoated socks during a 14-day field-training course. Cadets rated their own foot odor, and dermatologists who did not know the sock assignment examined their feet.¹

The coated-sock group developed less pitted keratolysis, a superficial bacterial skin infection. However, foot-odor ratings fell in both groups without a statistically significant difference between them. The uncoated group reported a greater negative effect of odor on daily life.¹

Those are three different outcomes. The infection finding and daily-life result do not turn the nonsignificant odor-rating comparison into proof of a stronger deodorizing effect.

The short military-training setting also limits the conclusion. This trial does not establish months of odor control, effectiveness after a particular number of washes, or the same result for another coating. The publisher identifies partial funding from the Siriraj Foundation and Dermatological Society of Thailand.¹

The treatment trial compared three approaches

A 2023 randomized trial² included 60 male security guards and hospital porters with pitted keratolysis. It compared 4% chlorhexidine scrub, coated socks and the combination, assessing treatment after four weeks.²

All groups showed clinical improvement. The combination produced the largest reduction in the foot-odor rating, but the difference was not statistically significant, with P = 0.186. The authors’ economic analysis favored chlorhexidine scrub with regular socks as the most cost-effective option.²

That cost finding reflects this study’s treatments and economic assumptions. It cannot tell you which product is cheapest where you live, or whether a more expensive sock will save you future treatment costs.

This was a small treatment trial in men with an identified bacterial condition. It does not establish a precise odor improvement for women with otherwise healthy feet. It also does not justify starting chlorhexidine on your own: the research comparison is a question to discuss with the clinician assessing your feet.

Check whether the problem includes pits or other skin changes

DermNet³ describes pitted keratolysis as a bacterial infection with crater-like pits and odor, typically on pressure-bearing areas of the soles. A clinician often identifies it by examination; skin scrapings can help exclude a fungal infection.³

The treatment may include topical antibiotics or antiseptics alongside moisture control. DermNet³ also recommends managing excessive sweating, changing absorbent socks and rotating dry insoles. Socks can be one part of that plan, but the coating label does not identify the cause of your symptoms.³

Our pitted-keratolysis observation guide covers what to record before a visit. If your concern is recurrent athlete’s foot, our socks, shoes and laundry article addresses fungal infection separately.

What to check before paying for a coating

Ask for the study on the specific preparation. Check whether it measured odor on people, bacterial growth on a fabric sample, or prevention of a diagnosed condition. Then check the follow-up and comparator. A laboratory bacterial reduction is a different claim from fewer embarrassing odor episodes after a workday.

Keep care-label and replacement details beside the price: washing instructions, any tested wash durability and the number of pairs needed for your routine. Neither short trial provides a universal replacement schedule for antibacterial socks.

For everyday care, NHS⁴ guidance recommends washing feet at least daily, drying between the toes and letting shoes dry before wearing them again. If excessive sweating is the problem, it advises changing socks at least twice daily. A pharmacist can discuss powders, antiperspirants, insoles or antibacterial socks.⁴

Seek a GP assessment if odor has not improved with self-care or is affecting daily life. That recommendation concerns identifying the cause, including sweating or fungal infection, rather than finding a stronger fragrance.⁴

Chapter 7, “Sole Searching,” in Arms Up includes “Socks, Shoes, and What Hasn’t Been Tested.” Its foot entries in the Fresh Log record footwear, wear time, wetness, smell and skin changes so those details can guide the next step.