http://www.pdrhealth.com/drug_info/nmdrugprofiles/nutsupdrugs/dhe_0094.shtml 
Title: Defending Against the Ravages of Time ,  By: Clouatre, Dallas, Shastri, Sid, Total Health, 0274-6743, December 1, 2003, Vol. 25, Issue 6
Database: Health Source - Consumer Edition
http://www.agelessteam.com/stephen/le1.html
www.healthchecksystems.com/antioxid.htm