Our most popular comes in oil form as well! Black walnut hulls have been used medicinally for hundreds of years. Their medicinal benefits are largely attributed to the primary active compound juglone. Juglone has been shown to possess antifungal, antimalarial, antiparasitic, antibacterial and antiviral properties. When used externally, as with this salve and oil, the benefits are mainly antifungal. This salve or oil is useful in treating skin diseases, particularly of a fungal nature, including eczema, psoriasis, nail fungus, and it is a very effective and natural treatment for athlete's foot. Only 3 ingredients in the salve and 2 in the oil -- all organic and/or locally foraged, so you can feel good about what you're using! The difference between the oil and salve is application preference! The oil tends to be better for nail and scalp applications for quicker absorption while the salve is better for skin rashes, as it stays on the skin longer than the oil.