czdaily,, Immunity Booster, Boost your Immunity, vitamin c, vitamin d, zinc

Vitamin C has been noted in many studies to have a positive effect on upper respiratory infections, including decreasing the duration and severity of symptoms. It is known to be essential to a healthy immune response in the following ways:​

  • It is required for the synthesis of collagen, which helps keep the epithelial barriers (skin, lungs, etc.) strong.

  • Specific white blood cells rely on vitamin C to help stimulate their function.

  • The antioxidant activity of vitamin C is needed to counteract extremely high levels of oxidative stress that result from the inflammatory response, which can damage healthy cells and their proper immune response.


Vitamin D plays an important role in the body’s initial defense against a pathogenic invasion as well as its complex role within the adaptive immune system. In summary:

  • Vitamin D allows immune cells and epithelial cells (such as those in the lungs and gastrointestinal tract) to increase their production of antimicrobial peptides, regulate certain immune cells, and reinforce the physical barrier for better response against infections; this is especially true for the airway epithelial cells in response to a viral infection.

  • Vitamin D is needed by certain white blood cells to help them recognize, bind to, and destroy pathogens in the body (through processes called chemotaxis, autophagy and phagocytosis).

  • Vitamin D influences the gut microbiota and helps it maintain its immune modulating effects.


Zinc Impaired immune functions due to inadequate zinc status may be the most common cause of secondary immunodeficiency in humans.” Zinc deficiency impairs the capacity of many different immune cells to carry out their functions. Some of zinc’s roles within the immune system include:

  • Zinc is a necessary co-factor for the development and function of many different types of immune cells, including macrophages, neutrophils, natural-killer cells, and T cells.

  • Zinc is necessary for signaling between the cells of the immune system, so that specific cells can know what specific actions to take in response to a stimulus.

  • Zinc has anti-inflammatory and antioxidant properties.



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