Dr. Mark Hyman reiterated the powerful role of vitamin D in immune function in a recent post, calling it one of the simplest, yet most overlooked, tools for preventing disease and supporting recovery.
“Vitamin D enhances innate immunity and modulates the adaptive immune response,” said Mark Hyman, MD in a post on X. “Low vitamin D levels have been associated with increased susceptibility to infections, autoimmune diseases, and poor outcomes in illnesses like COVID-19. And it’s so easy to fix.”
Vitamin D supports the body’s first line of defense by activating pathogen-fighting cells and also helps regulate longer-term immune activity. Studies have shown that deficiency in vitamin D is linked to higher risks of respiratory infections, chronic inflammation, and autoimmune conditions such as multiple sclerosis and type 1 diabetes.
During the “COVID-19 pandemic”, several observational studies found correlations between low vitamin D levels and worse clinical outcomes. While supplementation is not a cure, many health professionals, including Hyman, argue that optimizing vitamin D is a crucial and low-cost step in disease prevention.
Mark Hyman, MD, is a functional medicine practitioner, bestselling author, and advocate for root-cause approaches to health. He regularly speaks on the connection between nutrition, immunity, and chronic disease prevention.
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