azorubine
Explanation: It's a typo, should be azorubina (azorrubina) (a dye, very commonly used in drug manufacturing). 1,2-Dihydro-1,2-azaborine is an extraordinarily rare and toxic compound and would not be present in a dietary supplement.
-------------------------------------------------- Note added at 7 hrs (2009-10-24 21:37:55 GMT) --------------------------------------------------
See http://en.wikipedia.org/wiki/Azorubine
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