There is no general answer to this question: first specify exactly the substance and then we can check. Unfortunately, for the sake of advertising, most of this compounds claim to have positive effects of antioxidantia, but never show proof!
There are definite reports about the increase in seed germination due to increase in enzymatic activity upon bio-inoculation . And , likewise there are definite response of biofertilizers on increased activity of anti-oxidant enzymes upon bio-inoculation..