One of the main functions of vitamin D is to help activate T cells, aka the "killer cells" in the body. T cells actually detect and destroy foreign pathogens -- like viruses. "That makes vitamin D especially crucial for maintaining a functioning immune system that's capable of fighting back foreign pathogens,
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This is true but it never hurts to warn people not to over do it. After all the last thing you want to do is make yourself sick while trying to avoid getting sick.
It is not that easy to overdose on Vitamin D...
30 minutes in the Sun (beach day) is over 10,000IU of Vit D.