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Immune Booster #1 of 5

Joshua Corn, Editor-in-Chief of, lays the groundwork for optimal immune function with 5 basic strategies. Don't wait! Although it's best to start BEFORE the cold & flu season hits, we're in the middle of cold & flu season 2019, so start today!

#1. Optimize your vitamin D levels. Vitamin D is critical to the activation of the innate immune response.[1] If your levels of vitamin D decrease rapidly, which often happens with less direct sun exposure during the colder winter months, your vulnerability to infection increases. Most people need to take between 1,000 and 5,000 IU of vitamin D3 daily to achieve optimal vitamin D levels.

Scientific References:

1. Journal Molec Med. 2010. 88(5): 441-450.

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