Our expert says:
absorption of Vitamin D can be influenced by co-factors as well. I have found sometimes that patients respond to a lower dose (like 5000iu a day) better than once a week high dose. A blood tests can be done to test for Cealiac's and intestinal permeability - both which can affect absorption. Thyroid is another factor that can affect vitamin D's use in the body. If you have Rheumatoid arthritis this is generally a sign that the whole body could be inflamed particularly the GIT. This can affect absorption. Consider also Omega 3 oils for your symptoms.
Have a look at the metagenics product for Bone health - ostera. Does not cause constipation.
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