This is the dosage that Supplementwatch.com recommends (found in a quote from Karen):

http://www.supplementwatch.com/supa...upplementId=159

Green Tea: Typical dosage recommendations are for 125-500mg/day – preferably of an extract standardized to at least 60% polyphenols and/or EGCG as a marker compound (this should be equivalent to 4-10 cups of brewed green tea).

I believe the reason Walmart is so cheap is because you cannot get the 60% polyphenols from there, that's why I went to GNC and got it for 9.99. (80 % polyphenols)