Changes in immunomodulatory properties of Echinacea spp. root infusions and tinctures stored at 4 °C for four days

Phytomedicinal preparations from members of the genus Echinacea are popular worldwide and frequently used to treat upper respiratory infections. With the increasing popularity of herbal medicines, many people are making their own Echinacea extracts at home and storing them at refrigerator (4 °C) temperatures. We tested the hypothesis that Echinacea extracts made using homemade methods change in immunomodulatory efficacy with storage at 4 °C over...