What you soak your feet in depends on what you’re trying to fix. Epsom salt is the go-to for sore, achy feet. Vinegar works best for fungal problems. Baking soda targets odor. And for dry, cracked heels, you have a few options worth knowing about. Here’s what actually helps, what the evidence says, and how to do each one safely.
Epsom Salt for Sore, Tired Feet
Epsom salt (magnesium sulfate) is the most popular foot soak ingredient, and it’s primarily used for muscle soreness and general relaxation. The theory is that dissolved magnesium absorbs through your skin and helps reduce lactic acid buildup in your muscles. That said, there’s no definitive proof that magnesium actually passes through the skin in meaningful amounts. Most of the evidence for Epsom salt soaks is based on personal experience rather than clinical trials.
Even so, the warm water itself provides real benefits. Heat increases blood flow to your feet, loosens tight muscles, and can ease joint stiffness. Whether the magnesium adds something on top of that is debatable, but millions of people swear by it. To try it, dissolve about half a cup of Epsom salt in a basin of lukewarm water and soak for 10 to 15 minutes.
Vinegar for Fungal Issues
If you’re dealing with athlete’s foot or toenail fungus, a vinegar soak creates an acidic environment that makes it harder for fungi to thrive. Apple cider vinegar is the most commonly recommended type, though white vinegar works too. The standard ratio is one part vinegar to two parts water. So if you use two cups of water, add one cup of vinegar.
This won’t cure a serious fungal infection on its own, but it can help manage mild cases or serve as a complement to antifungal treatments. Soak for 10 to 15 minutes. If you notice any stinging, irritation, or broken skin on your feet, dilute the mixture further or skip the vinegar soak entirely, since acid on open wounds is painful and counterproductive.
Baking Soda for Foot Odor
Foot odor comes from bacteria breaking down the acids in your sweat. Baking soda (sodium bicarbonate) neutralizes those acidic compounds directly, cutting off the chemical reaction that produces the smell. It’s one of the simplest and cheapest foot soaks you can do.
Add three to four tablespoons of baking soda to a basin of warm water and soak for 10 to 15 minutes. This won’t kill the bacteria themselves, but it removes what they feed on. For persistent odor, doing this a few times a week can make a noticeable difference, especially combined with rotating your shoes so each pair has time to dry out between wears.
Options for Dry, Cracked Heels
For thick calluses and cracked skin, plain warm water softens the outer layer enough to follow up with a pumice stone or foot file. But if you want more aggressive softening, there are a few additions worth considering.
Products containing urea are among the most effective for tough, dry foot skin. Urea is a keratolytic, meaning it chemically softens the bonds holding dead skin cells together. It works without lowering your skin’s natural pH, which makes it gentler than acid-based exfoliants. Creams with 12.5% urea or higher are designed specifically for severely dry, cracked, or scaly skin. You can soak first in plain warm water, then apply a urea-based cream afterward for the best results.
Acid-based exfoliants like glycolic acid or salicylic acid also break down dead skin, but they lower the skin’s pH in the process. For people with sensitive skin, this can cause irritation. Some heel balm products combine urea with glycolic acid to get both hydration and exfoliation with less irritation than acid alone.
The Listerine Foot Soak
You’ll find this remedy all over the internet: soaking your feet in a mix of Listerine, vinegar, and warm water to soften rough skin. There’s no scientific research backing this use, but there’s a plausible reason it might help. Listerine contains methyl salicylate, which is chemically almost identical to salicylic acid, a proven skin exfoliant. A 2010 study also found that methyl salicylate provided significant muscle pain relief compared to a placebo, so it may pull double duty on soreness too.
If you want to try it, mix equal parts Listerine, white vinegar, and warm water. Avoid this soak if you’re allergic to any of its active ingredients: eucalyptus, menthol, thymol, or methyl salicylate (which is related to aspirin).
Contrast Baths for Swelling and Circulation
If your feet are swollen or you’re recovering from an injury, alternating between hot and cold water can help reduce inflammation and improve blood flow. This technique, called a contrast bath, works by repeatedly dilating and constricting blood vessels, which acts like a pump to move fluid out of swollen tissue.
You’ll need two containers. Fill one with hot water between 100 and 110°F, and the other with cold water between 59 and 70°F. The protocol from Cincinnati Children’s Hospital follows this pattern: start with 3 to 4 minutes in hot water, then 1 minute in cold, and repeat that cycle. Always start and end in the hot water. The full session can last up to 30 minutes. This is especially useful for ankle sprains, plantar fasciitis flare-ups, or feet that swell after long periods of standing.
Temperature, Timing, and Safety
Regardless of what you add to the water, two things matter most: temperature and duration.
Water should be lukewarm, slightly warmer than body temperature. WebMD specifically warns against using hot water because it can burn your skin, particularly if you have diabetes or peripheral neuropathy that reduces sensation in your feet. If you can’t comfortably hold your hand in the water, it’s too hot.
Keep soaks relatively short. For most purposes, 10 to 15 minutes is enough. The Cleveland Clinic notes that frequent or prolonged soaking increases moisture retention in the skin, which can actually raise your risk of fungal infections like athlete’s foot. For ingrown toenails, even 5 to 7 minutes is sufficient. After any soak, dry your feet completely with a clean towel, paying attention to the spaces between your toes where moisture likes to linger.
- Epsom salt: half a cup in a basin of lukewarm water, 10 to 15 minutes
- Vinegar: 1 part vinegar to 2 parts water, 10 to 15 minutes
- Baking soda: 3 to 4 tablespoons per basin, 10 to 15 minutes
- Contrast bath: alternate hot (3 to 4 min) and cold (1 min) for up to 30 minutes
If you have open wounds, blisters, or active infections on your feet, soaking can push bacteria deeper into the skin or cause further irritation. Let broken skin heal before trying any foot soak, and if a soak causes redness, burning, or increased pain, stop and rinse your feet with clean water.