poast wrote:
  At the time he
thought that my levels were slow in rising which brought into question the
quality of the supplement I was taking.
FWIW, I belong to many health related email lists, and I've seen umpteen posts from people with low D, taking varying amounts of varying supplements. The common thread seems to be that D is slow to raise for almost everyone across the board. I've not yet seen anyone who actually improved D levels iwth low level supplementation (less than 5000 IU per day). I've also seen people who had IV vit D and it did get their levels up, but once they stopped the high dosing, either IV or oral, their levels dropped faster than they had raised.

Other nutrient affect D levels, such as vit A. I've read a lot that carotene supplements don't work well as the conversion in the body to active A is quite low. And most MDs and many health gurus are scared to death of anyone taking real vit A in doses that might actually work, LOL. A is necessary for many processes in the body, including conversion of T4 to T3 (T3 is the active thyroid hormone), and that is one of the processes for which carotene is not effective, it has to be the active vit A (from Nutrition Almanac v.3) It often is the case that taking one supplement alone without making sure one is also not deficient in the supporting nutrients just doesn't work well, and can even make related deficiencies worse.
my personal opinion,
sol


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