Tulsi leaves are also called holy basil leaves and come from a plant used in Ayurvedic medicine, states WebMD. The Hindi word "tulsi" means holy basil, which has the botanical name Ocimum teniuflorum or Ocimum sanctum. This is an endemic plant of Southeast Asia.
Holy basil is an aromatic plant used in Ayurvedic medicine for centuries because of its purported healing properties. Its leaves and extracts were recommended for conditions such as ringworm, earaches, bronchitis, stress and colds. As of 2015, there is insufficient evidence that suggests that holy basil may be efficacious for many of these ailments. In a review of findings from 2010, there are suggestions that this plant may have therapeutic value, according to the National Institutes of Health's U.S. National Library of Medicine - PMC. However, more investigative clinical research is necessary to demonstrate holy basil's effectiveness for these different medical uses.