For the third module, the second literature review was the same for both groups. The literature review aimed for the students to answer what excipients are and how they affect biopharmaceutical products. The article by Zheng et al. was more accessible to the students. It discussed caffeine as an excipient to lower the viscosity of certain biological drugs, which sparked interest since caffeine is familiar to students. Students could quickly understand the topics discussed in the article while learning more about the topics that the other team highlighted. They learned that excipients are small compounds added to the drug solutions to improve stability. The excipients could interfere with the protein-protein interactions.