Gore Whore (1994)

When a lab assistant steals an important formula and all its documentation from Dr. Whitman, he hires a bottom-of-the-barrel private eye, Chase Barr, to locate it. When Barr digs deeper into the case he finds the lab assistant is actually a dead sex worker named Dawn and the "formula" is a reanimation agent that, with the consumption of human blood, is keeping her alive.