The book "Vax-Unvax: Let the Science Speak" is authored by Robert F. Kennedy Jr. and Brian Hooker PhD. It is based on over one hundred studies in the peer-reviewed literature that consider vaccinated versus unvaccinated populations. Each study is analyzed, and health differences among infants, children, and adults who have been vaccinated and those who have not are presented and put in context.

The book covers various topics such as the infant/child vaccination schedule, thimerosal in vaccines, live virus vaccines, the human papillomavirus (HPV) vaccine, vaccination and Gulf War illness, influenza (flu) vaccines, hepatitis B vaccination, the COVID-19 vaccine, and vaccines during pregnancy.

It was published on August 29, 2023, and has been noted as a New York Times bestseller.