Victus is the "life" aspect, representing all living things.
While it's used in a handful of infusions and crucible recipes, the most prominent use of Victus is to fuel the Lamp of Fertility.
Victus is found directly in meat and eggs, but also has many compounds from which it can be centrifuged, notably Bestia, Fames, Mortuus, and Herba. (Limus is also a source.) Corpus and Humanus can also provide a great deal of Victus, but these require multiple centrifugings.