High Content Of Natural Steroid Found In It Has Medicinal Properties Himanshu Bhatt | TNN Surat: Potato is the most commonly consumed vegetable in the world. The same potato if grown on creepers and not under the soil can work wonders. This variety of potato has a high content of natural steroid which when extracted and used as a medicine would work as an oral male contraceptive. Dr Yagnesh Vyas, professor of material medica in an ayurvedic college in the city, said when the steroid is extracted from this variety of potato, it would work as an oral male contraceptive and its bulb as sex tonic.