Try Essential Oils
Don't overlook essential oils for keeping nails and skin healthy -- tea tree oil, for example, may help treat acne, dandruff, scabies, vaginal infections, ringworm, and other fungal and bacterial infections, including athlete's foot and onychomycosis -- a common fungal infection of the nails.
Tea tree oil is an essential oil that's made from the leaves of the tea tree (Melaleuca alternifolia), and it can be useful in treating nail infections because of a natural active antimicrobrial compound in it called terpinen-4-ol. Never take tea tree oil orally -- dilute it before use and apply it topically to your skin and nails to help prevent and treat fungal infections.
Of course, the only thing better than finding the perfect treatment for yellow nails is to never have them in the first place, which brings us to the last two items on our list.