Just "D" Facts about Vitamin D

Benefits of Moderate UV Sunshine Exposure

Archive for February, 2015

Sunlight and Artificial Ultraviolet B Radiation

Posted by D3forU on February 10, 2015

Vitamin D Deficiency

Michael F. Holick, M.D., Ph.D

Sunlight and Artificial Ultraviolet B Radiation

Sensible sun exposure can provide an adequate amount of vitamin D3, which is stored in body fat and released during the winter, when vitamin D3 cannot be produced.7,15,85,108-110

Exposure of arms and legs for 5 to 30 minutes (depending on time of day, season, latitude, and skin pigmentation) between the hours of 10 a.m. and 3 p.m. twice a week is often adequate.2,7,108-110

Exposure to one minimal erythemal dose while wearing only a bathing suit is equivalent to ingestion of approximately 20,000 IU of vitamin D2.1,2,7,85

The skin has a great capacity to make vitamin D3, even in the elderly, to reduce the risk of fracture.109-111

Most tanning beds  emit 2 to 6% ultraviolet B radiation and are a recommended source of vitamin D3 when used in moderation.111-113,115

Tanners had robust levels of 25-hydroxyvitamin D (approximately 45 ng/ml [112 nmol/L) at the end of the winter and higher bone density as compared with nontanners (with levels of approximately 18 ng/ml [45 nmol/L).112

For patients with fat malabsorption, exposure to a tanning bed for 30 to 50% of the time recommended for tanning (with sunscreen on the face) is an excellent means of treating and preventing vitamin D deficiency (Table 3).113 This reduces the risk of skin cancers associated with ultraviolet B radiation.

Link to the full paper

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When is the best time to make Vitamin D with outdoor sun?

Posted by D3forU on February 9, 2015

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Vitamin D 100,000 IU daily was OK for a researcher for 6 months – Jan 2015

Posted by D3forU on February 9, 2015

Vitamin D 100,000 IU daily was OK for a researcher for 6 months – Jan 2015

Highlights of email of Jan 29, 2015 (which is below)

Cofactors: not stated – but probably was taking Magnesium and Vitamin K2
350 ng after 6 months, no Calcium problems (cofactors?)
Sunbathing reduced the level to 250ng/ml
Was anxious so stopped the dose
Back to 100 ng/ml in 6 months


In 2012 I decided to do a toxicity study on myself to help answer a few questions.

I started taking 100,000 IU/day in June of 2012.

I measured my 25(OH)D and Urine CA/Cr ratio every week.
The 25(OH)D was run by two different methods.
Towards the end I also had a 1,25 and 24,25 run.

My 25(OH)D slowly increased to 300 ng/ml by LCMS at about 4 months.
My serum and urine calcium and urine CA/CR ratio remained normal.

I wanted to see if sun exposure would affect 25(OH)D so I started sunbathing an hour every day for 2 weeks.
My 25(OH)D levels decreased to 250 ng/ml despite the fact I was still taking 100,000 IU/day.
It seemed to indicate that sun exposure will help reduce elevated 25(OH)D levels.

By six months my 25(OH)D level was 350 ng/ml but my serum CA, 24 hour urine calcium and CA/CR ratios remained normal.

However, I started having anorexia and nausea (some symptoms of D intoxication) when I got to 350 ng/ml so I stopped the vitamin D.

It took about 6 months for my 25(OH)D to get under 100 ng/ml.
The anorexia and nausea went away in about a month.

The different methods of measuring 25(OH)D showed about a 25% variance on some measurements.
My 1,25 never went above normal but my 24,25 level was elevated the last 3 months.

It is assumed that toxicity is a side effect of hypercalcemia.
I guess the anorexia and nausea may have been psychosomatic as I got very nervous when my 25(OH)D got above 200 ng/ml.

This is. John J Cannell, MD, Vitamin D Council Inc.

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Sunbeds: Closing Remarks – Mike Fischer

Posted by D3forU on February 9, 2015

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Outdoor Exposure and Sunbeds as a Means of Producing Vitamin D

Posted by D3forU on February 9, 2015

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