QS-21 is one of the active fractions of the bark of Chilean tree, Quillaja saponaria, purified using a reverse-phase chromatography
(RP-HPLC).

Vuroyal will hold the 2nd Online Technology Forum on Novel Vaccine Adjuvants on April 19, 2025 from 09:00am-11:30pm CET, focusing on the research process, clinical application, and related review submissions of saponin adjuvants, and discussing the innovative applications of saponin adjuvants.

Desert King®, a global leader in Quillaja saponaria-based vaccine adjuvants, has secured ​EXCiPACT™ certification for its Chilean pharmaceutical facility, becoming the ​first Chilean company and ​only global Quillaja supplier to meet rigorous GMP/GDP standards.

On March 20, 2024, vuRoyal and Desert King International will jointly organize the first QS-21 Forum in Shanghai, China. The day before the fifth Vaccine Innovation International Forum (VIF World 2024). The forum will bring together vaccine experts, researchers, business executives, policymakers and industry leaders from all over the world to jointly promote vaccine development and international cooperation.

The Desert King International, which devotes itself to support the production of adjuvant excipients for human vaccines and animal-protected vaccines, has recently been certified as a GMP-compliant manufacturer by the IPEC International Association of pharmaceutical excipients.