Wow, ask a question and then pull up a soap box. However, in fairness, your question is a little vague since Prodibio makes a line of products and you did not specify which one(s) you are using. Is it the biodigest? In which case, to answer your question specifically, since the point of the Biodigest is to diversify the bacteria strains and has nothing to do with the carbon dosing itself per se, then I would suggest that no, you would not alter the dosing amount of the vodka. If however, your are using Bioptim as a previous poster suggested, this product acts as the carbon source and therefore, vodka would be redundant and unnecessary.