Hartono R, Wirjatmadi B, Dachlan YP. Effect of Symbiotic Supplementation to the Immune Response Ifn-? and Il-2 on Elderly. IJSBAR. 2016;30(2):103-111. Accessed September 13, 2025. https://www.gssrr.org/JournalOfBasicAndApplied/article/view/6487