Kerasal Fungal Nail Renewal is applied in two phases: twice daily for the first week, then once daily for at least eight weeks after that. The product is a topical treatment designed to improve the appearance of nails affected by fungus, though it works as a cosmetic treatment rather than an antifungal medication. Here’s how to use it correctly and what to realistically expect.
Step-by-Step Application
During the first week, apply a thin layer to the affected nail twice a day, once in the morning and once at night. Make sure to work the product under the free edge of the nail (the part that extends past your fingertip or toe). Let it dry for a few minutes before putting on socks or shoes.
After that first week, switch to once-daily application and continue for a minimum of eight weeks. The total treatment period is at least nine weeks from start to finish. Consistency matters here. Skipping days slows the improvement process because the active ingredients need sustained contact with the nail surface to break down damaged tissue.
What the Product Actually Does
Kerasal contains two key ingredients: urea and lactic acid. Urea softens and hydrates thickened nail tissue, which helps the product penetrate deeper into the nail plate. Lactic acid lowers the pH on the nail surface, creating an acidic environment that discourages fungal growth.
Together, these ingredients improve the nail’s appearance by reducing discoloration, thickness, and brittleness. In a clinical study published through Scientific Research Publishing, 65% of patients saw some visible improvement in their target nail after just one week of treatment. That’s a cosmetic change, though, not a cure. The nail looks healthier because damaged layers are being broken down and hydrated.
This is an important distinction. Kerasal’s “clinically proven” claims refer to cosmetic improvements in how the nail looks and feels. The product does not penetrate the nail bed or eliminate the underlying fungal infection. If you have a confirmed fungal nail infection and want to eradicate it, you’ll need a prescription antifungal, either oral or a medicated topical that’s classified as a drug rather than a cosmetic. Kerasal can be a useful companion to those treatments since it improves nail appearance while the antifungal does the deeper work.
Tips for Better Results
A few practical details make a difference in how well the product works:
- Use a thin layer. More product doesn’t mean faster results. A thick layer takes longer to dry, is more likely to rub off onto socks, and doesn’t absorb any better.
- Apply to clean, dry nails. Moisture on the nail surface dilutes the product and reduces contact with the nail plate. Towel-dry thoroughly after bathing before applying.
- Don’t skip the free edge. Fungal infections often take hold under the nail tip. Applying under the free edge lets the formula reach areas where damage tends to be worst.
- Allow drying time. Give the product a few minutes to absorb before covering your feet. Putting on socks or closed shoes too soon can wipe the layer off before it has a chance to work.
- Trim affected nails. Keeping nails short reduces the total area of damaged nail and helps the product reach fresher growth more quickly.
How Long Before You See Changes
Most people notice the first visible changes within the first one to two weeks. In clinical testing, two-thirds of patients reported improvement after just seven days. Early changes tend to be subtle: the nail may look less discolored, feel slightly thinner, or appear smoother along the surface.
More significant improvement builds over the full eight-week maintenance phase. Keep in mind that toenails grow slowly, roughly 1 to 2 millimeters per month. Even with consistent use, it can take several months for a badly damaged nail to grow out and be replaced by healthier-looking growth. The product speeds up the cosmetic improvement, but it can’t accelerate how fast your nail physically grows.
Possible Side Effects
Kerasal is generally well tolerated, but some people experience mild irritation at the application site. The most common reactions are burning, stinging, or itching on the skin around the nail. These tend to be temporary and resolve on their own.
If you notice a rash, hives, blistering or peeling skin, or any swelling around your mouth, face, or throat, stop using the product. These are signs of an allergic reaction. People with very sensitive skin or conditions that compromise the skin barrier may be more prone to stinging and redness, with roughly 1 in 10 patients in that group experiencing these effects in clinical observations.
What Kerasal Won’t Do
If your goal is to cure a fungal nail infection permanently, Kerasal alone won’t get you there. The ingredients hydrate and smooth the nail surface, and the acidic environment may slow fungal activity, but the formulation is not designed to kill fungus at its source beneath the nail bed. Think of it as a cosmetic reset for damaged nails rather than a medical treatment.
For mild cases where appearance is your main concern, Kerasal can make a noticeable difference on its own. For moderate to severe infections where the nail is significantly thickened, crumbling, or lifting from the nail bed, pairing it with a true antifungal treatment gives you the best chance of both looking better in the short term and clearing the infection for good.