I am wondering about the problem with many vitamin D preparations is the other ingredients that they contain. Often they contain oil stabilizers that carry the vitamin D. Many of these are in the form of oils that are either simply not good for your health, such as: Cottonseed Oil , Soybean Oil, Corn Oil, Canola Oil and either these fats have been turned into the heart clogging trans fats OR they could turn rancid unless they are fresh.
But even with a date on the bottle, you have no idea how long that oil was sitting on the shelf before it was made into vitamin D.
So maybe the only safe bets are to have them made either without an oil stabilizer or in Coconut Oil - which does not go rancid.
I came across another pretty good article about this topic on another site and thought it might be worth sharing: How Is Vitamin D3 Different From Vitamin D?
It makes pretty much the same points, but the wording is a bit different.
I wold appreciate if Dr. Davis could make a post to address the value of vitamin K2 when taking vitamin D.
My chiropractor suggested I get tested for Vitamin D deficiency (two years ago) when I continued with chronic hip pain. I tested at 19 but after raising my level to 52 over the course of 9 months while taking 5,000 mg of D with K1 and K2, my hip pain was gone. I switched to a D supplement (6,000 mg) that I did not know had only K1 and did not have K2. My hip pain returned in the last year. I have read research recently that indicates that Vitamin D without K2, can cause calcium to be deposited in your arteries instead of your bones. Yikes! Is this why my hip pain returned possibly? Do I now need a Calcium scan of my heart?
I really appreciate Dr. Davis and have employed many of his strategies with great success. I would love to know what he thinks about taking Vitamin K2 with the new wonder drug/supplement Vitamin D. More important may be the danger of taking Vitamin D supplements WITHOUT Vitamin K2.
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Also, people should be aware that there is more than one vitamin D test, and sometimes doctors order the wrong one. The one you want is the25-hydroxy vitamin D test, also called a 25(OH)D. If your doctor orders a 1,25-dihydroxy-vitamin D test, the information will not tell you if your vitamin D blood levels are adequate or not.
Also, sometimes a doctor will tell you that a blood level of 30 ng/ml is adequate, but the experts are finding that that is only adequate to prevent rickets. For optimum health, 25(OH)D levels should be between 50-80 ng/ml, year-round.
Lots of good info here: http://www.vitamindcouncil.org/