New vaccine ingredient shows promise (IMAGE) La Jolla Institute for Immunology Caption A "combination" adjuvant called a saponin/TLR agonist may boost the protective power of vaccines. Credit NCI Usage Restrictions No restrictions. License Public Domain Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.