Reviewed by Evan Lewis, PhD. Last updated July 2026.
The glycolic acid foot hack is real. Sweep The Ordinary's 7% glycolic toner over your heels a few nights a week and you'll likely get smoother skin and less odor. TikTok didn't invent that, and the videos behind it have passed 6 million views for a reason.
It just doesn't finish the job. The hack skips your shoes, and it skips the fungal side of foot trouble entirely. We make Sole Shield, a foot and footwear spray, so weigh our take accordingly. Below is what the hack does well, and the two things it leaves out.
- Glycolic acid is an alpha-hydroxy acid. It exfoliates dead skin for smoother heels and lowers skin surface pH, which makes life harder for odor-causing bacteria.
- Use it right: a few nights a week to start, keep it off broken or cracked-open skin, moisturize after, and expect extra sun sensitivity on skin that sees the sun.
- The hack skips your shoes, the warm, damp place where odor bacteria and athlete's-foot fungus multiply and hop back onto clean feet every morning.
- Glycolic is an exfoliant, not an antimicrobial with fungal coverage. That's a different tool.
What the hack actually does
The Ordinary's Glycolic Acid 7% Toning Solution was made for faces. Someone pointed it at feet, and the internet took it from there.
Two things happen when you use it on heels. First, exfoliation: glycolic acid loosens the bonds holding dead skin cells together, and dead-skin buildup is most of what rough heels are. Sweep it on regularly and the buildup thins out. Second, pH: glycolic lowers the skin's surface pH, and the bacteria that break down sweat into that classic foot smell prefer less acidic ground. Fewer happy bacteria, less smell.
Both effects are real. Credit where it's due.
If you want a more dramatic version of the same idea, foot peel masks like Baby Foot run the acid concentration far higher in a single sitting, then shed the whole outer layer over a week. Bigger swing, same underlying chemistry, and, as it happens, exactly the same two gaps.
How to use it on your feet
- Start with clean, dry feet at night.
- Sweep the toner over heels and soles with a cotton pad. Skip broken or cracked-open skin.
- Let it dry, then moisturize.
- Two or three nights a week to start. Feet build tolerance the same way faces do.
- If your feet see sun in sandals, remember AHAs raise sun sensitivity.
What the hack skips
Two things, and they're both big.
Your shoes. Odor bacteria and athlete's-foot fungus don't just live on your feet. They multiply in the warm, damp dark inside your shoes, and every time you put a pair back on, yesterday's population moves back in. You can exfoliate nightly and still lose ground each morning at the shoe rack. We flagged the same gap in the Lume on feet hack and in the Mando version of it: the feet get all the attention, the footwear gets none.
The fungal side. Glycolic acid is an exfoliant. Lowering skin pH makes the terrain a little less friendly, but glycolic has no documented antifungal range. Iodine does. Its antimicrobial range covers bacteria and fungi, which is a big part of why the mineral has been trusted on skin since the 1800s.
That second job is what Sole Shield was built for. Two ingredients, elemental iodine and pure water, in a fast-drying 60ml mist made for feet and the inside of footwear. Mist your feet after showering, once they're fully dry. Spray the inside of your shoes after each wear. It's the routine used in 200+ foot care clinics across North America, and it's listed with Health Canada as a cosmetic.
Side by side
| Glycolic acid 7% toner | Sole Shield | |
|---|---|---|
| What it is | Alpha-hydroxy acid exfoliating toner | Two-ingredient aqueous iodine foot spray |
| Main job | Dissolves dead-skin buildup for smoother heels | Mists feet and footwear with iodine, whose antimicrobial range covers bacteria and fungi |
| Odor angle | Lowers skin pH, tougher ground for odor bacteria | Works the microbial side on feet and inside shoes |
| Works inside shoes | No, it's for skin | Yes, spray shoes after each wear |
| Routine | 2 to 3 nights a week to start | Daily: feet after showering (dry first), shoes after wear |
| Cautions | Keep off broken skin, adds sun sensitivity | Fast-drying, water based, no alcohol sting |
| Status | Cosmetic exfoliant | Listed with Health Canada as a cosmetic |
Our honest take
This is one of the better foot hacks TikTok has produced. If rough heels are your main complaint, glycolic alone might make you happy.
But foot odor and athlete's-foot-prone feet are a two-front problem: skin and shoes, texture and microbes. Glycolic covers one front. So we stack them. Glycolic a few nights a week for texture. An iodine mist daily for the microbial side, feet after the shower and shoes after each wear. The ingredient does the work, one natural mineral with an antimicrobial range that covers bacteria and fungi. The routine makes sure the work happens on both fronts, every day.
Smooth heels going back into yesterday's damp shoes is only half a win.
Sole Shield
The two-ingredient spray that covers what the glycolic hack skips: the microbial side, and your shoes.
✓ Two ingredients: elemental iodine and pure water
✓ For feet and the inside of footwear
✓ Fast-drying 60ml mist, no alcohol sting
✓ Used in 200+ foot care clinics across North America
✓ Listed with Health Canada as a cosmetic
Shop Sole ShieldCommon questions
Does glycolic acid help foot odor?
Yes. It lowers skin surface pH and clears the dead-skin buildup that odor bacteria feed on, so many people notice less smell within a couple of weeks. It only reaches your skin, though. Odor bacteria also live inside your shoes, so pair it with a footwear step for the full picture.
How do you use glycolic acid on your feet?
Sweep it over clean, dry heels and soles with a cotton pad at night, two or three nights a week to start. Skip broken or cracked-open skin, moisturize after it dries, and remember AHAs raise sun sensitivity on any skin that sees the sun.
Is glycolic acid or a foot peel better for rough heels?
They are the same chemistry at different intensities. Glycolic toner is a light, repeatable sweep a few nights a week that keeps buildup down over time. A foot peel mask is a single high-concentration session that sheds the whole outer layer over a week or two, then nothing for another two months. Regular maintenance suits most people better; peels suit a reset before sandal season. Neither touches your nails or your shoes.
Does glycolic acid help athlete's foot?
Not directly. Glycolic is an exfoliant, not an antifungal. Lowering skin pH makes the surface a little less inviting, but glycolic has no documented antifungal range the way iodine does, whose antimicrobial coverage includes fungi. And the fungus behind athlete's foot thrives inside shoes, which glycolic never touches.
Can I use glycolic acid and a foot spray together?
Yes, and they make a good pair. Keep them at different times of day: glycolic at night a few times a week for texture, and an iodine mist like Sole Shield daily, on feet after showering once they're fully dry, and inside shoes after each wear.
The bottom line
The glycolic acid foot hack earns its views: smoother heels and less odor from one drugstore bottle. Use it as directed and take the win. Then cover what it skips. Handle the microbial side, and spray the shoes. Our guides on getting rid of foot odor for good and the daily foot hygiene routine active people swear by show where Sole Shield fits in a full routine.
Evan Lewis, PhD, specializes in natural and nutritional therapies for the prevention and management of chronic diseases and their complications. His research spans chronic disease, diabetes complications, clinical nutrition, and nerve health, including the development of topical iodine therapy for foot care and wound health. IodinePure products are listed with Health Canada as cosmetics. The Ordinary and Baby Foot are trademarks of their respective owners; product information is from publicly available labeling and materials.
