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They are not intended for human consumption, medical use, or veterinary use

As already mentioned, the vast majority of nitrogen-containing molecules in yeast acquire their nitrogen from glutamate and to a lesser extent from glutamine, so continuous synthesis of these two amino acids is critical and highly regulated under iron-limiting conditions

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I am having symptoms that may not be related but started on the evening of post-vaccination day 1 soreness / mild inflammation on edges of eyelids- one side greater than another

and 2) the need to manufacture such proteins by recombinant methods at high cost would limit their widespread use