1. White paper on herbal products. American College of Clinical Pharmacy;Miller;Pharmacotherapy,2000
2. National Center for Complementary and Integrative Health (NCCIH) Natural products research - information for researchers https://nccih.nih.gov/grants/naturalproducts
3. U.S. Food and Drug Administration (FDA) What is a dietary supplement? www.fda.gov/AboutFDA/Transparency/Basics/ucm195635.htm
4. Global Industry Analysts, Inc The global herbal supplements and remedies market: trends, drivers and projections www.strategyr.com/MarketResearch/Herbal_Supplements_and_Remedies_Market_Trends.asp
5. Herbal dietary supplement sales in US increase 6.8% in 2014;Smith;HerbalGram,2015