Elderly males and females (>65 years)>6-month life expectancy, as judged by physicianWilling to be randomized into study groupsAble to swallow pillsNot currently on antibioticsIf consuming RDA levels of supplement, willing to replace with our control supplement; calcium, vitamin D and iron supplements are permittedWilling to receive influenza vaccineBMI > 18 kg/m 2 and albumin >3.0 g/dL. Here, ALB is linked to influenza.