Perri, D., Dugoua, J.-J., Perri, D., & Koren, G. (2018). Safety and efficacy of echinacea (echinacea angustifolia, e. purpurea and e. pallida) during pregnancy and lactation. Journal of Population Therapeutics and Clinical Pharmacology, 13(3). Retrieved from https://www.jptcp.com/index.php/jptcp/article/view/583