The COVID-19 vaccines give your body temporary instructions fight off COVID-19. Your body naturally destroys the instructions and gets rid of them. None of the vaccine ingredients remain in your system. They do not alter any DNA in your body. The three COVID-19 vaccines currently available in the United States do not contain eggs, preservatives, fetal tissue, stem cells, mercury, or latex. For a full list of ingredients, please see each vaccine’s Fact Sheet for Recipients and Caregivers: Pfizer COVID-19 vaccine Moderna COVID-19 vaccine Novavax COVID-19 vaccine