QS21 adjuvant from Desert King®: the global gold standard in natural vaccine adjuvants
QS21 adjuvant from Desert King®: the global gold standard in natural vaccine adjuvants
The QS21 adjuvant from Desert King® is a highly purified saponin fraction obtained from the bark of Quillaja saponaria, a tree endemic to Chile and recognized as one of the most potent natural adjuvants used in human and veterinary vaccines. Thanks to its high purity, renewable origin, and robust clinical evidence, the QS21 adjuvant from Desert King® has become a global benchmark in vaccine adjuvants, supporting approved vaccines and advanced clinical programs for infectious diseases and oncology.
What is the QS21 adjuvant from Desert King®?
The QS21 adjuvant from Desert King® is a pharmaceutical-grade saponin fraction produced through advanced reverse-phase HPLC purification to achieve the quality standards required for human vaccine applications. This adjuvant is designed to promote both humoral and cellular immune responses, a key feature for modern vaccines that require strong and durable immune activation.
The QS21 adjuvant from Desert King® is part of an integrated manufacturing system that includes strict quality controls, batch-level traceability, and international certifications to ensure consistent performance in vaccine formulations. This combination of scientific robustness and industrial scalability positions QS21 from Desert King® as a preferred adjuvant for global vaccine manufacturers.
Saponins from Desert King® in approved vaccines and clinical development
Desert King® ‘s pharmaceutical-grade Quillaja saponins are used in five globally approved vaccines that protect millions of people against high-impact diseases such as COVID-19, malaria, RSV, and shingles. The inclusion of the saponins from Desert King® in these vaccines confirms its stability, quality, and performance in large-scale, globally distributed vaccine formulations.
In addition, the saponins from Desert King® are present in 26 Phase III clinical candidates in areas such as oncology immunotherapy, infectious diseases, and Alzheimer’s disease. This broad late-stage pipeline reflects the industry’s confidence in high-purity, sustainable Quillaja saponins as critical components for next-generation vaccine platforms.
Manufacturing the QS21 adjuvant from Desert King® under GMP standards
Desert King® has the infrastructure, certifications, and production capacity required to supply human vaccine–quality saponins adjuvant at industrial scale. The Excipact certificaction ensures that the entire production chain operates under GMP standards, from the manufacturing of our ultra-purified Quillaja saponin extracts to the final purification of QS-21 at our European CMO.
The company operates facilities in the United States, Chile, and Mexico and is currently the only manufacturer capable of providing GMP-volume saponin-based ingredients suitable for use in human vaccines.
This industrial model ensures:
– Lot-to-lot consistency and reproducibility in vaccine formulations
– Reliable long-term supply for vaccine manufacturers and research programs
– Rigorous quality controls aligned with international pharmaceutical standards
– A trusted source of QS21 adjuvant for both commercial vaccines and clinical trials
Innovation and sustainable sourcing of Quillaja saponaria
Responsible sourcing of Quillaja saponaria is a strategic pillar for Desert King® and a key differentiator of the QS21 adjuvant and other saponin based adjuvants from Desert King®. The company has developed a long-term sustainability model that combines native forest management, high-yield plantations, and patented technologies to identify trees with higher saponin content.
This integrated forestry and plantation strategy is based on:
– Patented technologies that optimize the selection of Quillaja trees with superior saponin profiles
– High-yield plantations that complement native forests and secure long-term biomass supply
– Efficient biomass utilization, using almost every part of the tree (bark and brancheswood, )
– Sustainable pruning techniques that allow harvested trees to recover for several years before reuse
These practices reduce pressure on native ecosystems and reinforce Desert King® ‘s position as a leader in sustainable QS21 adjuvant and Quillaja-based products.
The QS21 adjuvant from Desert King® within our pharmaceutical portfolio
The QS21 adjuvant from Desert King® is a cornerstone of the company’s pharmaceutical portfolio of Quillaja saponaria–based adjuvantsfor human and veterinary vaccines. Desert King® supplies consistent, high-purity saponins that help vaccine developers enhance immune responses and improve the performance of their formulations.
If you would like to learn more about our QS21, other pharmaceutical saponin adjuvants, and broader Quillaja portfolio, visit our pharmaceutical solutions page.


