The first phase of studies into the 'COVID-19 cure' devised by a Krishnapatnam-based herbal medicine practitioner in Andhra Pradesh was completed on Wednesday. The studies were organised under the directions of the Central Council for Research in Ayurvedic Sciences (CCRAS). They were jointly conducted by the Regional Ayurvedic Research Centre in Vijaywada, and the Sri Venkateshwara Ayurveda College in Tirumala.