<p>Silverstersmom: I am concerned with you saying you are taking 50,000 IU/week of vitamin d…Did your Doctor prescribe that amount and is he/she doing follow up blood work…that seems excessive…Vitamin D is one of those fat soluable vitamins so can build up to a toxic level if taken in excess…it’s not recommended to take more than 2,000 IU/day unless your doctor has prescribed more.</p>
<p>I’m not a doctor or nutritionist but am an RN and this topic was presented on another web site I visit so I had done some reading on the subject…these are some of the things I found…(I’ll just copy what I wrote before)…Don’t take it as gospel…there could be mistakes :)</p>
<p>One report I read stated that 85% of the patient’s one Dr. tested were Vitamin D deficient… </p>
<p>Vitamin D is inactive in it’s original form…after vitamin D enters your body either by skin exposure to the sun or dietary it then is taken to the liver where it is converted to the 2nd form calcidiol.(which is a pre-hormone)…which then travels to the kidneys to be converted into the active form calcitriol…(I guess there are a few other organs that can help with this conversion…but mostly it’s done in the kidneys)…The form that is measured by the blood test at your doctors office is calcidriol…(converted in the liver)… The calcidiol takes 2 pathways…1st to the kidneys to be converted to the active form calcitriol which is one of the most potent hormones in the body…it controls the blood regulation of calcium…only if there is enough calcidiol to satisfy the kidney’s needs does the 2nd pathway get used…this is where all the excitement recently has been as studies are showing that when the extra calcidiol goes down the 2nd pathway…to the tissues where it can also be converted to calcitriol then it has potent anti-cancer agents…they are still doing studies on this </p>
<p>If there is a glitch with any of these systems then you will probably become deficient. (intake-whether dietary or sun exposure…liver…or kidney function) </p>
<p>The active form of Vitamin D is important in immune function, mood stabilization, blood pressure regulation, weight loss (insulin resistance), of course…bones, </p>
<p>The old DRI (dietary Recommended Intake) for vitamin D was 200 IU for 19-50y.o. 400 IU for 51-70 and 600 IU >70 y.o.
However, studies are starting to show that much more than that is necessary…some recommend 3000-5000 IU daily…However recommended safe levels are 2000 IU a day…so unless you are under a DR. care probably should not take more than the 2000 IU a day. </p>
<p>One study showed that if you go into the sun in a swim suit just until you turn pink then your skin will manufacture between 10,000-50,000 IU of the inactive form of Vitamin D…Darker skinned people will produce less (more around the 10,000 level) However, because of the body’s protective mechanism you are not at risk of vitamin D toxicity…if too much is manufactured then the skin will also break it back down…this is not the case with a vitamin D supplement/dietary consumption which you can take too much of as this safety mechanism is bypassed (vitamin D is not water soluable…DEKA vitamins are fat soluable and therefore do not readily pass out of the body if you take in too much) </p>
<p>Those of you living above the 35-40degree horizontal latitude line (just below NY) then the sun is not as strong and will take longer to produce the same effect…glass blocks most UVB as does sunscreen above 15…UVB is necessary to produce the vitamin D </p>
<p>If your supplement happens to list the vitamins as MCG instead of IU then the conversion rate is 5mcg = 200IU for vitamin D…In a supplement you might see it listed as D or D3 (same thing) </p>
<p>I find it interesting that dogs/cats produce vitamin D in their fur…as the sun cannot reach their skin (except for my dogs-which I shaved)…when they groom themselves they are then orally ingesting the Vitamin D…</p>