some biologic stereoisomers from algal organisms could conceivably be economically viable for pharmaceutical applications but i would bet that most of the molecules that might end up as food additives would be more cheaply synthesized if the market becomes large enough. (edit:i'd check on vitamin B12 production as a check on that statement). If the food additives remain a niche market then bug growing wins but do you really want to invest in a niche market?
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