The caution is for supplements. The calcium in food will be greatly enhanced absorption with HIGH dose Vit D3.

thank you so much Mrs.D!!! And thank you for the correction.... I hope Glenn will not be mad at me.

He's cool.... he'll laugh... watch for his response.

I am sure he will definitely response to my harmless faux fax.

Thank you Mrs.D.

Between this and the uncertainty as to my gender this morning in the other thread, I'm LOL-ing. Which is a good thing, as I still haven't been able to fill up my vehicle post Sandy.

This is fascinating. It makes me realize how little I know regarding the interaction between different vitamins and minerals.

I take 2000 IU of D3 twice a day. If you supplement adequate amounts of magnesium, then will this limit the calcium regardless of D3 dosage?

Also, in the summer we can absorb several times these levels of D3 from sun exposure. Do you think it is better to not take D3 on days you're outside more?

I was told by my doctor that continuous exposure to sun at least 15 mins everyday wont require supplementation of VitD3. However, dark-skinned will require longer than 15 mins. During winter when people tends to stay indoors, it is recommended to take the supplement. But in my case, I take Vitd3 all year round.

I don't take my D3 in summer. Only for 3/4 of the year.
I take much more than 2,000 IU.
The 2,000IU is really not that high these days. When the doctors are discussing D I think they are referring to 4,000 IU a day and up. The average person needs 1,000 IU D3 to raise 10pts on the serum testing. Heavier people with more body fat may need more. It is really best to have a baseline test to see where you are, and adjust accordingly.

The worry is that fixing Vit D levels (raising them) will change the ratio of calcium absorption. Traditionally only 20-25% of a dose of calcium in a supplement is absorbed. Increase D and you change that %. It is thought that excess calcium may hang around and deposit in arteries (atherosclerosis). But that is not proven yet...just suspected. Some doctors tell their patients to take really high calcium today. And this is what is being discussed by cardiologists. The current suggestion is no more than 600mg a day for those on high dose D therapies. Not all doctors know this however.
http://blog.trackyourplaque.com/2010...vitamin-d.html

This link may not take you to the blog...I had some difficulty with that site. To find this doctor's opinion, look on the left hand column, choose Vit D in the list and find 6-2010 to see the recommendation. The title of the blog entry is
Increased blood calcium and Vit D.

Thanks MrsD. I know magnesium plays a crucial role in the regulation of calcium. Supplementing 400 mg of magnesium a day should limit excess calcium due to D3 supplements, diet, etc. Would you agree? I know the combination of several vitamins and minerals introduces a lot of possible scenarios depending on the dosage of each type.

I had virtually no vit d found in blood testing. Started with prescription vitd (50,000) but eventually starting using a daily dose of D3 from walmart. Eventually my number went up to about 50 over the course of a year. Went tested again last Dec, numbers were down so Dr. recommended 15,000 through the winter months here in Northern Va. Also, I am outside quite a bit during the summer, training/riding/teaching horseback riding and was also our summer swim team rep (always out in the sun). It has not made one bit of difference how much time in the sun I spent, my numbers would not come up until loading up on orals-

J.