Thick, yellowing toenails is not really a cosmetic problem. It’s a sign of an active fungal infection, one that won't be cured by itself. If not addressed properly it becomes significantly harder to treat the longer it goes unaddressed.
Managing symptoms without tackling the underlying cause, will not cure your infection. In this guide learn what's actually happening beneath the nail, why common treatments aren't effective, and what a better treatment approach looks like.
Fungal infection, onychomycosis, is the most common cause. When fungal spores go beneath the nail plate, they start breaking down the nail's structure, this results in thickening, yellowing, brittleness, and in some cases, nail separation from the nail bed.
There are many other reasons for nail thickening besides fungus. Nail thickening can happen from psoriasis, injury, poor blood flow or circulation, and medications that were prescribed to treat other conditions. It is important to identify the correct underlying cause as treating psoriasis with medication intended to kill fungus will not be effective; therefore wasting time and money on treating the wrong condition.
A licensed provider can confirm the diagnosis before treatment begins. With STRIDE™, that evaluation happens entirely online — no clinic visit, no waiting room.
If it’s very early, surface-level infections, OTC antifungal products that contain clotrimazole or tolnaftate can give some benefit. But their effectiveness doesn’t last long. Many patients come to STRIDE after spending months or years trying creams, nail lacquers, and home remedies without meaningful improvement.
The main problem is penetration. Nails have dense keratin layers that block most topical agents from reaching beneath, where the fungus actually lives. Most OTC products cannot overcome this barrier, that’s why patients use them for months and see very little change.
This is why STRIDE™ ClearNail Renewal™ is designed. Unlike OTC topicals, it's a prescription-grade formula containing Urea breaks down the nail plate, Lactic Acid enhances absorption, Terbinafine acts as the active antifungal agent, and DMSO as a pharmaceutical penetration enhancer. This is specifically formulated to reach the infection beneath the nail, not cure the surface area.
Combination therapy of oral and topical together gives the fastest and complete results for infections.
Oral terbinafine works systemically through the bloodstream, going through the keratin barrier and reaching the nail bed. Clinical success rates are more than 70–90%, this is far above what any topical treatment achieves alone.
The primary concern patients have with oral terbinafine is the potential for liver-related side effects, which are associated with taking the medication daily for 12 weeks.
Pulse therapy prescribes terbinafine for 7 days, then pauses for approximately 90 days before repeating if needed. Terbinafine binds to nail keratin and remains active in nail tissue for weeks after each dosing cycle so the nail stays protected without continuous daily medication. The result is a meaningfully reduced liver-related side effect risk, without sacrificing effectiveness.
At STRIDE™, pulse dosing is built into the treatment protocol, not an afterthought.
STRIDE DUO™ is a dermatologist-developed combination treatment system clinically effective in 89% of cases. It pairs oral terbinafine on the pulse dosing protocol with STRIDE™ ClearNail Renewal™ topical — attacking the infection top-down through the bloodstream and bottom-up through the nail surface simultaneously.
This dual-mechanism approach is specifically designed to overcome the three barriers that cause most treatments to fail: the nail's keratin shield, fungal biofilm protection, and dormant spores that trigger reinfection.
Prescription oral terbinafine — pulse dosed for safety and effectiveness
STRIDE™ ClearNail Renewal™ topical — deep penetration prescription formula
Personalized dermatologist dosing protocol
Full treatment delivered to your door — no in-person visit required
If your nails have been thickening or turning yellow for more than a few months, if OTC treatments haven't really worked, or if you have diabetes or a compromised immune system. Consulting a professional is essential.
The good news is you don't need to book a clinic appointment. STRIDE's telehealth model means a licensed dermatologist reviews your case online, confirms the diagnosis, and prescribes the appropriate treatment — all from your phone or computer. Your prescription is delivered directly to your door.
Nails grow slowly, and you have to keep realistic expectations. Even when treatment is working as intended, visible improvement takes time.
Weeks 8–12: Visible improvement is seen, as new, healthy nail growth appears.
Months 6–9: Clearance is seen in moderate infections
Months 9–12: Full clearance in more advanced cases
Ready to treat the root cause, not just the surface?
👉 Begin Dermatologist-Developed Treatment