I have the same product. I see no indication of N on the labeling. It is marked with zero, meaning it doesn't have enough to be labeled as '1,' not that it has zero N. What makes you think it has any significant bioavailable nitrogen in it? Any bioavailable N-containing molecules in the product would be at too low concentrations to do anything.
This and most other complex liquid mixture commercial products often simply need surfactants, buffers, stabilizers, antioxidants, etc., either natural or synthetic, and some of these molecules likely contain N.