Maximize the benefits: For stress relief, try holy basil extract from New Chapter or Om Organics, widely available in health food stores. To aid in breast cancer treatment, Nangia-Makker advises drinking this tea daily: Pour 2 cups boiling water over 10 to 15 fresh holy basil leaves (other varieties of basil won't work) and steep 5 minutes. Remove the leaves before consuming. If you are being treated for breast cancer, be sure to check with your doctor. You're unlikely to find the plants at your local nursery, but you can order them and organic holy basil seeds from Horizon Herbs.