[Dysart]

I've long wondered that myself since these chocolate-is-healthful-studies first trickled out a couple yrs ago. I've only heard references to "a small amount" and the like. I'm still trying to nail it down.

There's actually a company that caters to consumers seeking beneficial chocolate: http://www.cocoavia.com/

Interesting business concept, IMO.

[RightWhale]

If it is cocoa beans there may be no limit, but if it is chocolate bars there may be reasonable limits because of the other ingredients.