Hepatitis B vaccines: are they safe? For many years, parents have vaccinated their children with the CDC’s schedule without second thought, assuming that their pediatrician and government agencies have their best interest at heart. However, is that the full story? Tune in to ‘Doctors & Scientists’ to hear the science on these injections — their ingredients and dosage as well as adverse events and studies done to compare those who received the shot and those who did not.