Demand is heating up for Quillaja saponin-based adjuvants, which owe their existence to the soap bark tree (Quillaja saponaria) found primarily in Chile. In particular, the QS-21 saponin adjuvant is popular. It is found in GSK’s (NYSE:GSK) Shingrix shingles vaccine, GSK’s Mosquirix malaria vaccine and Novavax’s (NSDQ:NVAX) COVID-19 vaccine. QS-21 is uniquely capable of enhancing…