This is an interesting premise for a book and it could be helpful for new vegans especially. It is basically an encyclopedia of ingredients in foods, medicine, beauty products, household products and so on, saying whether each one is derived from animals (and whether living or dead, as in milk or lanolin from live animals and lard from dead) and a quick description of the ingredient. This would be useful for folks who aren't vegan too, who just want to know what all these strange sounding ingredients really are.

That said, out of curiosity I looked up some common vaccine ingredients to see how they'd be listed, especially human ingredients (Some vaccines are cultured on human lung tissue from aborted fetuses and thus, some vaccine ingredient pamphlets list "human diploid lung fibroblast cells" in their ingredients. According to Wikipedia "Vaccines produced in WI-38 include those made against adenoviruses, rubella, measles, mumps, varicella zoster, poliovirus, hepatitis A and rabies," for instance). This is not to debate the ethics of using aborted fetus cells in vaccines or vaccines themselves, I was just curious if the book would list human-derived ingredients as well as animal-derived ones. It didn't include that at all and when I looked up other common vaccine ingredients those were not listed either (either animal-derived ones like monkey or pig cells which are also quite common as culturing media or chemical ingredients). I went on to look up some other medical ingredients I could think of and didn't find many, so I'm not sure how thorough the medical portion of this book is.

That said, it seems quite thorough in terms of food ingredients and household ones. One caveat is that additives are added so frequently that books like this can become outdated faster than other books. This is a really thorough book with information about thousands of ingredients though, and should be helpful especially for those who are newly vegan and are trying to avoid as many animal-derived products as possible.