Most of the things we all eat comes from dubious origins. The average meal comes from several different continents and from animals and plants grown under a wide range of conditions. If you buy all of your ingredients in their least processed form then you have a shot at knowing roughly where it came from. Good luck if you buy anything canned, in a box, or pre-made at a restaurant and don't even bother trying with supplements.

Soylent isn't from another planet and isn't made of some crazy chemicals just invented. Looking at its ingredients list isn't any stranger than looking at the ingredients list of almost any product in the supermarket.