Micronutrients like vitamins A, C, D, E, B6, B12, folate, zinc, iron, copper, and selenium are essential for proper immune function. These nutrients support physical barriers and immune cells and may require intake levels higher than current recommendations, especially during infection, stress, or lack of sleep.
During illness, nutrient needs increase, and plasma levels, such as vitamin C, can fall significantly. Addressing deficiencies often requires higher intakes than the standard RDAs to support recovery and maintain optimal immune function.
Micronutrient deficiencies, even mild ones, can impair immunity. Evidence suggests that supplementing with these nutrients, especially vitamins C, D, and zinc, may boost immune function and reduce infection risk.
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