Benefits Of Healthvit The Onion essential oil is obtained through the steam distillation extraction process from the bulbs of onion. This oil is highly rich in vitamin A, B and C and some other nutrients. The therapeutic properties carried by this oil are antisclerotic, bactericidal, digestive, carminative, expectorant, diuretic and depurative. Due to these medicinal properties, this oil is beneficial in curing many of the health diseases. It is also used in culinary purposes and found in every Indian home.