Nutritional Yeast for Immune Function

The available studies linked to this topic do not provide direct, specific evidence regarding nutritional yeast and immune function. The collection includes a protocol for a multi-nutrient supplement trial in elderly adults, a computational review suggesting certain micronutrients may support vaccine response, and a range of studies examining microbial biology, insect models, and fungal pathogens — none of which isolate nutritional yeast as an intervention or draw conclusions about its immunological effects in humans. Research suggests that individual micronutrients found in nutritional yeast, such as B vitamins and zinc, have been associated with immune cell regulation in broader nutritional literature, but the studies provided do not allow conclusions to be drawn about nutritional yeast itself. Readers should note that the evidence base here consists largely of non-human model organism studies and one unreported trial protocol, which substantially limits the ability to generalize any findings to human immune outcomes from nutritional yeast consumption.