Quote:
Originally Posted by OPRMC
Hi, I've tried large amounts of D3 like you mentioned above in the past and noticed no difference. Had a long overdue physical a month ago, and my D levels were were normal. Thyroid was checked recently as well and was on the low side of normal. Only thing that wasn't in the normal range was cholesterol which wasn't surprising since shoving food in my face has been one of the main ways I've dealt with depression in the last few years since I stopped drinking so much.
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Unfortunately for us there is major debate about what is normal for vitamin D3 levels. The old school of thought is normal is what is measured in normal people under normal conditions. The new school of thought is that our sun is the rate limiting factor in the generation of vitamin D3, and that regardless of what is normally observed in people, these levels are chronically always on the low side. Doctors don't have time to check every value on a lab report, instead the lab simply flags values that fall outside of the observed ranges. So if the lab is operating off the old standard, your vitamin D status could come back as normal despite it actually being insufficient.
The Vitamin D Council recommends that level should be between 40 - 80 ng/mL, their vitamin D3 25(OH)D range guidelines are as follows (listed in both ng/ml and nmol/l):
0 - 30 ng/ml: Deficient.
31 - 39 ng/ml: Insufficient.
40 - 80 ng/ml: Sufficient.
>150 ng/ml: Toxic.
0 - 75 nmol/l: Deficient.
76 - 99 nmol/l: Insufficient.
100 - 200 nmol/l: Sufficient.
>375 nmol/l: Toxic.
What do you mean when you say your thyroid was on the low side of normal? Are you referring to your TSH level? Low TSH is nearly always a good thing, generally the lower it is the better. It's a round about way of measuring if your getting enough iodine in your diet. High TSH is an indicator of iodine deficiency, or some other general defect in thyroid hormone production.