Is the current immunization schedule safe? Vaccines are drugs. They contain antigens, preservatives, adjuvants, stabilizers, antibiotics, buffers, diluents, emulsifiers, excipients, residuals, solvents, and inactivating chemicals. They also contain residue from animal and human growth mediums. Why are these substances put into vaccines? Why do vaccines contain mercury and aluminum? Why are so many vaccines given at the same time? What effect do they have on the developing child? How common are adverse reactions to vaccines?