Guide
Nails and the antifungal label
The word that sends many buyers to this line is nail. The labels are specific about where these products apply.
Do over-the-counter antifungals work on nail fungus?
Their labels say no. The federal rule puts one sentence on every such panel: "This product is not effective on the scalp or nails." All 7 Hongo Killer drug labels print it.
This product is not effective on the scalp or nails.
Creams, lotions, or powders don't work for ringworm on the scalp.
What the CDC says about nails
A nail that changes color or shape is not always infected, and the CDC's advice starts with a test, not a product.
Finger and toenails can become discolored or change shape for many different reasons including previous injuries. Talk to a healthcare provider about testing before beginning treatment for a fungal infection.
Prescription antifungal medication taken by mouth is usually the best treatment.
The two bottles with a brush
Antifungal Solution is a drug: undecylenic acid 25%, with a Drug Facts panel that lists athlete's foot and ringworm. Its carton places it on the skin around and next to the nails.
Nail Formula is a cosmetic. Its label speaks of the color of the nail and of cleaning away keratin debris, and states that the product does not contain a drug.
Antifungal Solution1 fl oz (30 mL)
Drug Facts
Active ingredientPurpose
Undecylenic Acid 25% w/vAntifungal
Uses
For the cure of most:
- athlete’s foot (tinea pedis)
- ringworm (tinea corporis) For the relief of:
- itching
- burning
- scaling
- cracking
- soreness
- irritation
Warnings
For external use only.
Flammable: Keep away from fire and flame.
Do not use
- on children under 2 years of age unless directed by a doctor
When using this product:
- avoid contact with eyes or mucous membrane
Stop use and consult a doctor if:
- irritation occurs
- there is no improvement within 4 weeks
If pregnant or breast-feeding, consult a health care professional before using the product.
Keep out of reach of children. If swallowed, get medical help or contact a Poison Control Center right away·
Directions
- clean the affected area and dry thoroughly
- apply a thin layer of Hongo Killer® Antifungal Solution over affected area twice daily (morning and night) or as directed by a doctor
- supervise children in the use of this product
- for athlete’s foot: Pay special attention to spaces between toes; wear well fitting, ventilated shoes, and change shoes and socks at least once daily
- for athlete’s foot and ringworm, use daily for 4 weeks. If condition persists longer, consult a doctor
- this product is not effective on the scalp or nails
Other information
- store between: 15°-30° C (59°-86° F)
- protect from freezing, if freezing occurs, warm to room temperature
Inactive ingredients aloe, fragrance, hypromelloses, isopropyl alcohol, tocopherol acetate (vitamin E), water
Label text as printed. Source: Product label published by Efficient Laboratories; DailyMed (National Library of Medicine), label on file with the FDA. Read 7 October 2026.
Nail Formula1.0 fl oz (30 mL)
On the label
Indications
Nail Formula by Hongo Killer® helps restore color to dicolored fingernails and toenails and helps maintain healthy looking nails by removing keratin debris through cleaning.
Warnings
For external use only.
Supervise children in the use of this product.
Do not use on children under 2 years of age.
When using this product avoid contact with the eyes and mucous membrane.
Keep out of reach of children.
If swallowed, get medical help or contact a Poison Control Center right away.
If pregnant o breast-feeding, consult a professional health care, before using this product.
This product does not contain a drug nor claim any actions as defined by the United States Food and Drug Administration. These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure or prevent any disease.
Directions
- Clean the affected area and dry thoroughly
- Apply a thin layer of Hongo Killer® Nail Formula over the affected area twice daily (morning and night).
Ingredients Purified water, acetic acid, glycerin, propylene glycol, aloe vera, xanthan gum and fragrance.
Label text as printed. Source: Product label published by Efficient Laboratories. Read 7 October 2026.
Sources
- Code of Federal Regulations: 21 CFR Part 333, Subpart C: Topical Antifungal Drug Productsread 7 October 2026
- Centers for Disease Control and Prevention: Treatment of Ringwormread 7 October 2026
- Centers for Disease Control and Prevention: Ringworm Basicsread 7 October 2026
This is general information, not medical advice. Read the label on the pack before use, and ask a doctor or pharmacist about your own case.