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Diabetes not treated by single dose of vitamin D – RCT Aug 2017

Effects of Vitamin D Supplementation on Insulin Sensitivity and Insulin Secretion in Subjects With Type 2 Diabetes and Vitamin D Deficiency: A Randomized Controlled Trial

Diabetes Care 2017;40:872-878 | https://doi.org/10.2337/dc16-2302, accepted 11 April 2017
Hanne L. Gulseth,1,2 Cecilie Wium,1,2 Kristin Angel,3 Erik F. Eriksen,1,4 and Kare I. Birkeland1,4
1Department of Endocrinology, Morbid Obesity and Preventive Medicine, Oslo University Hospital, Oslo, Norway
2Hormone Laboratory, Oslo University Hospital, Oslo, Norway
3Department of Cardiology, Oslo University Hospital, Oslo, Norway
4Institute of Clinical Medicine, University of Oslo, Oslo, Norway
Corresponding author: Hanne L. Gulseth, h.l.gulseth at medisin.uio.no.


Intervention group had < 40 ng by the end of the first month
Need to have > 40 nanograms for many months to treat diabetes

Overview Diabetes and vitamin D contains the following summary

  • Diabetes is 5X more frequent far from the equator
  • Children getting 2,000 IU of vitamin D are 8X less likely to get Type 1 diabetes
  • Obese people get less sun / Vitamin D - and also vitamin D gets lost in fat
  • Sedentary people get less sun / Vitamin D
  • Worldwide Diabetes increase has been concurrent with vitamin D decrease and air conditioning
  • Elderly get 4X less vitamin D from the same amount of sun
        Elderly also spend less time outdoors and have more clothes on
  • All items in category Diabetes and Vitamin D 535 items: both Type 1 and Type 2

Vitamin D appears to both prevent and treat diabetes

Number of articles in both categories of Diabetes and:
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  • Dark Skin 24;   Intervention 56;   Meta-analysis 38;   Obesity 35;  Pregnancy 44;   T1 (child) 39;  Omega-3 11;  Vitamin D Receptor 24;  Genetics 12;  Magnesium 27    Click here to see details

Some Diabetes studies

50 ng of Vitamin D fights Diabetes

T1 Diabetes


Diabetes, Metabolic Syndrome and Magnesium - many studies

Diabetes category starts with the following

535 items In Diabetes category   33+ Prediabetes studies   64+ Type 1 Diabetes studies

see also Overview Diabetes and vitamin D  Overview Metabolic Syndrome and vitamin D

Autoimmune category listing has 194 items along with related searches

In observational studies, low vitamin D levels are associated with type 2 diabetes (T2D), impaired glucose metabolism, insulin sensitivity, and insulin secretion. We evaluated the efficacy of vitamin D supplementation on insulin sensitivity and insulin secretion in subjects with T2D and low vitamin D (25-hydroxyvitamin D [25(OH) D] <50 nmol/L).

Sixty-two men and women with T2D and vitamin D deficiency participated in a 6-month randomized, double-blind, placebo-controlled trial. Participants received a single dose of 400,000 IU oral vitamin D3 or placebo, and the vitamin D group received an additional 200,000 IU D3 if serum 25(OH)D was <100 nmol/L after 4 weeks. Primary end points were total Rd by euglycemic clamp with assessment of endogenous glucose production and first-phase insulin secretion by intravenous glucose tolerance test.

In the vitamin D group, the mean ± SD baseline serum 25(OH)D of 38.0 ± 12.6 nmol/L increased to 96.9 ± 18.3 nmol/L after 4 weeks, 73.2 ± 13.7 nmol/L after 3 months, and 53.7 ± 9.2 nmol/L after 6 months. The total exposure to 25(OH)D during 6 months (area under the curve) was 1,870 ± 192 and 1,090 ± 377 nmol/L per week in the vitamin D and placebo groups, respectively (P < 0.001). Insulin sensitivity, endogenous glucose production, and glycemic control did not differ between or within groups after treatment (P = 0.52). First-phase insulin secretion did not change significantly after treatment (P = 0.10)

Replenishment with a large dose of vitamin D3 to patients with T2D and vitamin D deficiency did not change insulin sensitivity or insulin secretion. These findings do not support such use of therapeutic vitamin D3 supplementation to improve glucose homeostasis in patients with T2D.

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Diabetes not treated by single dose of vitamin D – RCT Aug 2017        
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