whole foods vs. extract

Green Tea Powder (whole food) vs. green tea 'extract'

Scientific studies show that isolated antioxidants do not have the same potency as the mixture of antioxidants found in natural food sources. 

Scientists mixed up only some 'major' constituents including EGCG to create 'artificial' teas based on their relative levels in green teas and white teas, and compared its potency to the potency of real, complete green teas and white teas.  The results showed real, complete green tea and white tea exhibited higher potency compared with the corresponding artificial teas.  The scientists concluded that major constituents including EGCG might increase their potency acting synergistically with other minor constituents in green tea and white tea. 

references:

Santana-Rios G, Orner GA, Amantana A. Provost C, Wu SY, Dashwood RH.  Potent antimutagenic activity of white tea in comparison with green tea in the Salmonella assay.  Mutat Res. 2001 Aug 22;495(1-2):61-74