Protocol · Dermatological/Infectious
Nail Fungus (Onychomycosis) Support Protocol
Nail fungus (onychomycosis) is a fungal infection that thickens and discolors nails, most often toenails. Prescription antifungal tablets work best: in a review of 48 trials with 10,200 people, terbinafine cleared the nail far more often than placebo and worked better than azole tablets. Among non-prescription options, 100% tea tree oil has limited evidence: in one trial of 117 people it did about as well as a 1% clotrimazole solution, and the fungus cleared in 18% after 6 months. No supplement taken by mouth has been shown to clear nail fungus. See a clinician to confirm it, especially if you have diabetes.
Sources: PMID 28707751; PMID 8195735; PMID 19489654
We are re-verifying the studies cited on protocol pages; only confirmed citations are shown.
What the evidence says
- A Cochrane review of 48 trials (10,200 people) found high-quality evidence that terbinafine and azole tablets (such as itraconazole) clear toenail fungus more often than placebo, and moderate-quality evidence that terbinafine works better than azoles, with a similar rate of side effects.
- In a double-blind trial of 117 people with lab-confirmed toenail fungus, 100% tea tree oil or 1% clotrimazole solution was applied twice a day for 6 months, with nail filing. Results were similar: the fungus cleared in 18% with tea tree oil and 11% with clotrimazole, and about 60% in each group looked partly or fully better. Limited evidence, from one trial.
- Biotin has been studied for brittle nails, not for nail fungus. A 2018 review found small trials reporting firmer, thicker brittle nails with oral biotin and called for larger controlled trials.
- In people with diabetes, nail fungus is among the significant predictors of foot ulcers, and a review advises early treatment along with good foot care.
- We found no trials of zinc, probiotics or vitamin E taken for nail fungus, and none of the three is graded for it.
Safety and when to see a clinician
- Biotin can skew blood tests. When 6 healthy adults took 10 mg a day for a week, 9 of 23 lab tests that use biotin gave false results, including thyroid tests, and lab studies show biotin can make troponin, a heart-attack test, read falsely low. Tell your doctor and the lab if you take biotin.
- If you have diabetes, poor circulation or a weak immune system, have a clinician look at your feet instead of treating nail fungus yourself, and get prompt care for redness, swelling, pain or broken skin around a nail.
- Antifungal tablets need a prescription and can interact with other medicines, so the prescriber should check everything you take.
- Tea tree oil is for use on the nail only. Don't swallow it, and stop if the skin around the nail gets red, itchy or sore.
The stack
5 supplements · none graded yet
| Grade | Supplement | Amount listed | Why it’s in the stack | Evidence on file |
|---|---|---|---|---|
| Primary stackThe core of this protocol | ||||
| Tea Tree Oil (Topical) | Amount listed: 100% tea tree oil applied to affected nails twice daily | Antifungal properties; may help as adjunct to medical treatment | Not graded yet | |
| Biotin | Amount listed: 2.5–5 mg daily | Studied for brittle nails, not fungus; can skew thyroid and heart blood tests | Not graded yet | |
| Supporting stackListed as additions to the core | ||||
| Zinc | Amount listed: 15–30 mg daily | Supports immune function and nail health | Not graded yet | |
| Probiotics | Amount listed: 10–20 billion CFU daily | Supports immune function; may help balance fungal overgrowth | Not graded yet | |
| Vitamin E | Amount listed: 200–400 IU daily | Antioxidant; supports nail and skin health | Not graded yet | |