i think i found something some time ago about plasma levels...i didnt save it...
i think it wasnt that much that was absorbed...
... i'll try to find it again.
edit: ok found something else(but requires purchase), a sort of meta-analysis of multiple types of flavonoids,
tea flavonoids all have very poor absorbtion & bioavailability in humans
the absolute bioavailability (in the rat) was 1-3% (low) for high doses of administered ECG.
also says that the ORAL bioavailability of tea flavonoids in humans is due to poor transport from intestine and very efficient elimination by conjugation
(= "metabolized" in the liver very quick, before it reaches systemic circulation)
[url=http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6T38-4BKDRXV-2&_user=10&_coverDate=04%2F01%2F2004&_alid=781065491&_rdoc=17&_fmt=high&_orig=search&_cdi=4940&_docanchor=&view=c&_ct=42&_acct=C000050221&_version=1&_urlVersion=0&_userid=10&md5=1680d2968e40d2c56b28fabcb3503c8d]Absorption and metabolism of flavonoids
Free Radical Biology and Medicine, Volume 36, Issue 7, 1 April 2004, Pages 829-837[/url]
found something else
, which mentions for most flavonoids that reach blood, their half life is 1-2h = it goes out quick unless you keep drinking tea
(but then you get alot of water with it, so....)