1 Definition of QS21

Meaning of QS21: A substance from plants that is being studied together with vaccine therapy for its ability to improve the way the immune system responds to disease.

A substance from plants that is being studied together with vaccine therapy for its ability to improve the way the immune system responds to disease. It belongs to the family of drugs called saponin adjuvants.

For learning, not diagnosis. This glossary provides general educational information and is not a substitute for advice from a qualified healthcare professional. If you may be experiencing a medical emergency, contact local emergency services.