[Blennos]

Levels vary with different test and labs, but 40 or above seems to be what is desired. You can supplement with between 1000 and 2000 IUs per day. There is some controversy about what the best intake level should be.

http://www.mercola.com/2004/jul/3/vitamin_d_levels.htm

[goodnesswins]

Thanks...I’ve been taking a minimum of 2400iu per day for over a year.....and usually more like 3400iu (add’l 1000 in D3 tablet form). I buy Carlson’s Lemon Flavored Cod Liver Oil From MERCOLA! by the case!