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urea is a precursor to ethyl carbamate, a known carcinogen. you can boil bakers yeast (as the homedistiller forum suggest, yeast hulls don't provide nitrogen but thats also not the point of using hulls) for amino acids. DAP is also better than urea because it has a N base (diammonium) and P (phosphate), the two macros that you'll likely be deficient in. You need to ensure that all of the nutrients (or at least the DAP addition) is metabolized before the finish of fermentation because residual N will affect flavor. This is one of the reasons why you add at the beginning of fermentation or after 1/3 of the sugars have been depleted. For my current use, I add it at the start of fermentation and after 12-16 hrs depending on ferment speed and lag time - but I'm doing fresh pressed sugarcane (agricole-style) which is an entirely different beast than most of y'all