Traditional vaccine adjuvants are not needed. They alarm the immune system so it identifies the antigens as menance. Traditional vaccines mix antigens with poison to lure macrophages into eating and presenting the antigens to the naive T cells. mRNA vaccines use cells to create the antigens. The cells then present the antigens to naive T cells. DrBeen medical lectures, mechanism explained at 12:00: https://youtu.be/xDeAc4T-nls