DaniPro Nail Polish
It’s a bitter beauty irony: If you have nail fungus, you long to cover it with polish. However, that’s ill-advised, because polish can trap the fungus and exacerbate the condition. Enter daniPro Nail Polish, which also treats toenails with undecylenic acid, a topical antifungal. Available in 12 colors.
To buy: $25, danipronailpolish.com.