Definition: The Hepatitis B Vaccine (Recombinant) Adjuvanted is a vaccine that contains recombinant proteins from hepatitis B virus, as well as adjuvants such as a heat-inactivated cell adjuvant that acts as an immunodominant carrier protein to increase antigenicity and enhance the immune response. Adjuvant carriers are substances added to vaccines to help them stick better to the immune system's target cells, typically making them more potent at stimulating an immune response.