@ddljohn-- I'm not sure about genetic engineering but the giberellin hormones that people inject to plants is not the same exact hormone that plants produce naturally. It is a synthetic hormone, meaning that it is produced in the lab.
So even thought it does the same thing as the natural gibberellin hormone found in plants, it's still unnatural. In that sense, I do think that it might have different affects on the plants and on us when we consume it. But scientists don't know about the long term consequences of genetically engineered plants or synthetic hormones yet. So I don't think we know for sure whether it has any negative effects on our health or not.