soymilk is unfit for human consumption, as are most soy products unfit for human consumption, being that the soybean is highly indigestible, even for ruminant animals such as cows, which is why "first run" cattle manure is used to make livestock feed, because so much of the soy protein remains undigested the first time through

only fermented soy products should ever be consumed, those such as tofu, miso, or soy sauce, and then only sparingly or in moderation, but never as a staple of the diet