If you are not getting regular sun exposure on large amounts of your skin you may need anywhere from 5 to 20,000 units of oral vitamin D3 per day. (articles.mercola.com)
Be sure to increase your vitamin D through good amounts of regular sun exposure and / or taking a high quality vitamin D3 / K2 supplement. (drjockers.com)
The best utilized source of Vitamin D is what we produce in our bodies from moderate regular sun exposure over large portions of the body without burning. (truthaboutabs.com)