We aren’t able to produce enough Vitamin D of it this far north in the winter. I recommend 5,000 iu a day of Vitamin D for adults and 2,000 iu for children. Vitamin D is great for the immune system and I believe helps people from getting sick.
75% of us in North America are low in Vitamin D with over 95% of African Americans low it it. Vitamin D helps with heart, bone, mental, and immune health.
If people are starting to get sick around you, go up to 10,000 iu/day. If you get sick I am recommending 20,000 iu for up to 10 days. (The Vitamin D council recommends 40,000 iu/ day for up to 7 days).
Read more on Vitamin D here.