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Theaflavins for purposes that do not require absorption (oral health, stomach ulceration, intestinal or colonic interactions) can have bioactivity in the doses found in Black Tea (this may also be advisable as the capsule of a supplement would need to break for it to influence the stomach or oral cavity)
There is currently no evidence to support the best oral dose of supplementation, although studies tend to use 700 mg of Theaflavins once a day (this is said to be 30 cups of Black Tea, but that is a variable claim due to varying levels of Theaflavins in Black Tea to start).
Currently no evidence to support the best time of day or manner to take Theaflavin supplementation, although if using it for the purposes of hindering fat or carbohydrate absorption it would need to be taken alongside a meal containing those nutrients. *