This DIY Basil soap recipe has a hint pf Citrus to give it a fresh scent. This is a really nice herbal smelling soap featuring dried crushed basil leaf and citrus fragrance. You can use a Basil EO too if you like. The health benefits of basil essential oil include its ability to treat nausea, motion sickness, indigestion, constipation, respiratory problems, and diabetes. Basil oil is also a good source of Vitamin A, magnesium, potassium, iron, and calcium.