Vit D Levels – What Should Your Vitamin D Hormone Level Be?
Vit D Levels
Many people’s vitamin D levels are very low and this is a great concern because of its importance. Many people are confused about what their vitamin D level should be because different health agencies have different recommended vitamin D level guidelines.
The Institute of Medicine recommended a sufficient vitamin D blood level of 20 ng/ml. The Endocrine Society recommended sufficiency at 30 ng/ml, and the Vitamin D Council recommended sufficiency at 40 ng/ml.
What Is Vitamin D?
Vitamin D is a compound the body makes when the skin is exposed to the sun. This sets off a chemical reaction which converts cholesterol into vitamin D3.
The blood carries the vitamin D3 to the liver and the liver converts it into 25-hydroxyvitamin D, also called 25(OH)D. 25(OH)D is sent to the kidneys and the kidneys convert it into 1,25 dihydroxyvitamin D or 1,25(OH)2D.
1,25 dihydroxyvitamin D or 1,25(OH)2D is also called calcitriol. Calcitriol is more accurately termed a hormone than a vitamin. Vitamin D is involved in almost every metabolic function in the body because almost every cell has a vitamin D receptor. It’s estimated that around 2,000 genes are directly or indirectly regulated by vitamin D.
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The body makes its own vitamin D from sun exposure. With adequate sun exposure it is not necessary to consume vitamin D through foods or supplements.
Organizations Recommended Levels Of Vitamin D?
The government organization Institute of Medicine recommended the lowest level of vitamin D at 600 IU/day to maintain a vitamin D blood serum level at 20 ng/ml or 50 nmol/L. The institute came up with this recommendation basically to support only bone health, before science caught up to how vital vitamin D was to the health of the entire body.
Data from this study challenged the Institute of Medicine’s recommendation. It supported the minimal level to support bone health should be 30 ng/ml or 75 nmol/L.
This study challenged the recommendation for a minimal 30ng/ml blood serum level. The study found that traditional populations of East Africa had a mean blood serum vitamin D level of 46 ng/ml or 115 nmol/L.
This study analyzed how vitamin D levels corresponded to disease and found that the higher the vitamin D levels were the lower the disease rates. The study showed a steady decrease in disease rates up to the tested 70 mg/ml or 175 nmol/L blood serum level.
Vitamin D Levels And IU
The Institute of Medicine recommended 600 IU/day to maintain the 20mg/ml and the Endocrine Society recommended 2000 IU/day to maintain the 30 ng/ml level. The Vitamin D Council recommended 5000 IU/day to maintain a minimal 40 ng/ml or 100 nmol/L vitamin D level.
Keep in mind these are minimal vitamin D levels and many people fall short of the lowest 20 mg/ml recommendation. The Vitamin D Council recommended up to 80 ng/ml vit D levels as being a sufficient. The Endocrine Society set the top level for sufficiency at 100 ng/ml. People should aim for the upper range of the recommendations for vitamin D levels instead of the minimal.
IU To Increase NG/ML
The body can make 10000 IU and above of vitamin D daily without adverse effects. Medscape lists the following dosages of IU of vitamin D as being able to increase blood levels:
- 100 IU (2.5 mcg) per day increases vitamin D blood levels 1 ng/ml (2.5 nmol/L).
- 200 IU (5 mcg) per day increases vitamin D blood levels 2 ng/ml (5 nmol/L).
- 400 IU (10 mcg) per day increases vitamin D blood levels 4 ng/ml (10 nmol/L).
- 500 IU (12.5 mcg) per day increases vitamin D blood levels 5 ng/ml (12.5 nmol/L).
- 800 IU (20 mcg) per day increases vitamin D blood levels 8 ng/ml (20 nmol/L).
- 1000 IU (25 mcg) per day increases vitamin D blood levels 10 ng/ml (25 nmol/L).
- 2000 IU (50 mcg) per day increases vitamin D blood levels 20 ng/ml (50 nmol/L).
Using these calculations 5000 IU of vitamin D would raise blood levels by 50 ng/ml and 10000 IU would raise vitamin D blood levels by 100 ng/ml.
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 D is essential to the modern indoor lifestyle
 R Vieth. Why the minimum desirable serum 25-hydroxyvitamin D level should be 75 nmol/L (30 ng/ml). Best Pract Res Clin Endocrinol Metab. 2011 Aug;25(4):681-91.
 M F Luxwolda, R S Kuipers, I P Kema, D A Dijck-Brouwer, F A Muskiet. Traditionally living populations in East Africa have a mean serum 25-hydroxyvitamin D concentration of 115 nmol/l. Br J Nutr. 2012 Nov 14;108(9):1557-61.
 W B Grant. Using findings from observational studies to guide vitamin D randomized controlled trials. J Intern Med. 2015 Jan;277(1):83-6.
 Vitamin D Council