The 2000IU of D3 may raise you 20 pts. That will still put you low.

The D2, is not active in humans. D2 is made from plants.

Doctors don't know better, because their reference books are written by old doctors, who only know the RX form...which is over 40 yrs old.

If you use 5000 IU D3 daily instead of D2 at all you may raise close to 50 points. That D2 will not do much for you. Just because it is a "big sounding dose" doesn't mean it will work for you. I have a link to a study at the end of that thread.

Some people don't raise quickly... this has to due with other cofactors not being present like magnesium, or due to being overweight carrying alot of "fat"...where the D goes.
from http://www.vitamindcouncil.org/

will certainly read more. forgot about the co-factors... but also doesn't the prescription of: ergocalciferol (vit D supplement) 50,000 units also help? have just been a little freaked that my reading was so low...but good to know...and will try to handle

D2 has shown poor response in studies:

I guess I'll have to give you the link?

http://www.nutraingredients-usa.com/...-than-D2-Study

D3 is 87% more potent than D2 in raising D levels in the blood.

On that link I gave above is also a paper on MS.

On the average, medical doctors are not informed on the newest research on supplements. Especially on the D. They will test you but give you old useless products based on the tests.

If you read the experts, you will see. Mayo, Cleveland clinic etc...from links on that thread I gave you.

Should you do what your doctor advised...you will see perhaps 20 pt increase (based on the D3) 20pts is not enough for MS patients.