https://www.webmd.com/vitamins/ai/ingredientmono-981/echinacea 

https://www.nccih.nih.gov/health/echinacea

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4441164/

https://www.medicalnewstoday.com/articles/252684

https://www.healthline.com/health/anxiety/calming-effects-of-passionflower 

https://www.webmd.com/vitamins/ai/ingredientmono-871/passionflower

https://www.nccih.nih.gov/health/passionflower

https://www.medicalnewstoday.com/articles/323795

https://www.ncbi.nlm.nih.gov/books/NBK92775/ 

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7019938/

https://journals.lww.com/nutritiontodayonline/Abstract/2010/07000/Ginger__An_Overview_of_Health_Benefits.8.aspx?trendmd-shared=0

https://www.medicalnewstoday.com/articles/265990

https://www.healthline.com/nutrition/licorice-root 

https://www.webmd.com/vitamins/ai/ingredientmono-881/licorice

https://www.verywellhealth.com/the-benefits-of-licorice-root-89727

https://www.nccih.nih.gov/health/licorice-root