A fundamental misunderstanding about vitamin C has persisted in popular health discourse: that it actively boosts immune function. New research published in Nutrients clarifies this misconception, revealing that vitamin C plays a regenerative rather than stimulatory role in immune response.
When neutrophils—the body’s primary defense against pathogens—engage bacteria, they generate hypochlorous acid to destroy invading organisms. This oxidative burst, while effective, rapidly depletes the cell’s vitamin C reserves. Rather than enhancing immune activation, vitamin C serves as a critical refueling mechanism, allowing neutrophils to maintain their pathogen-fighting capacity across multiple encounters.
Neutrophils actively transport vitamin C from the bloodstream using specialized pump systems, achieving concentrations up to 80 times higher than plasma levels. This distinction has significant clinical implications, particularly for understanding why vitamin C supplementation shows variable effects depending on individual health status and stress levels.
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