"During the Vedic period, the fourth Veda, i.e., the Atharvaveda, is the first authentic record of the state of medical knowledge. The science of Ayurveda is an upanga (supplement) of Atharvaveda. The eight branches of Ayurveda are mentioned in Atharvaveda...However, the fundamental principles of Ayurveda was not documented during the “Vedic” period. The growth and development occurred during the Arsha period (period of rishis:sages)."