I read in a health book that it's not a good idea to make a big pitcher of green tea and leave it in the refrigerator for a week, because the polyphenols in it start breaking down and becoming ineffective soon after it's brewed.

Many sunscreens and lotions have not only green tea polyphenols in them, but vitamins and other supposedly healthful nutrients in them. But if the healthful compounds in green tea begin to breakdown, do they do the same in these lotions, creams, etc., thus losing their potency.

If so, how long would a bottle of such nutrient fortified lotion, ointment, etc. Last, even under idea conditions.

Any information on this would be appreciated.

James n. Dawson