Estimated equivalency of vitamin D production from natural sun exposure versus oral vitamin D supplementation across seasons at two US latitudes.

@article{Terushkin2010EstimatedEO,
  title={Estimated equivalency of vitamin D production from natural sun exposure versus oral vitamin D supplementation across seasons at two US latitudes.},
  author={Vitaly Terushkin and Anna M. Bender and Estee L. Psaty and Ola Engelsen and Steven Q. Wang and Allan C. Halpern},
  journal={Journal of the American Academy of Dermatology},
  year={2010},
  volume={62 6},
  pages={
          929.e1-9
        }
}

Assessment of the feasibility of using sunlight exposure to obtain the recommended level of vitamin D in Canada.

Although sun exposure is an important source of vitamin D, Canadians should look to other safe sources to meet the body's vitamin D requirements throughout the year.

Optimal Duration of Sun Exposure for Adequate Cutaneous Synthesis of Vitamin D in Indian Cities: An Estimate Using Satellite-Based Ultraviolet Index Data

The aim of the current study was to estimate the duration of sun exposure required for cutaneous synthesis of vitamin D in Indian cities using TEMIS satellite UV Index data, the only data available currently from India for this estimate.

Regional and seasonal variations in ultraviolet B irradiation and vitamin D synthesis in India

There was no increase in serum 25(OH)D levels following sun exposure during winter as the UVBI was significantly low, emphasizing the need for vitamin D supplementation during these months, while all the other three zones showed significant seasonal fluctuations.

The Vitamin D Debate: Translating Controlled Experiments into Reality for Human Sun Exposure Times

Results from both model and experimental data show that relatively short exposures of a modest amount of unprotected skin to summer sunlight in northern climes, on a regular basis during lunchtime hours, increases vitamin D to sufficiency status in the white Caucasian population.

Vitamin D Synthesis Following a Single Bout of Sun Exposure in Older and Younger Men and Women

Serum D3 concentration increased significantly in response to outdoor sun exposure in younger and older adults, suggesting that ageing may dampen cutaneous synthesis, sunlight exposure is still a significant source of vitamin D3.

Vitamin D binding protein is required to utilize skin-generated vitamin D

It is shown that in the absence of DBP, UVB does not correct vitamin D deficiency and injection of small amounts of recombinant DBP to DBP−/− mice restores the response to vitamin D produced in skin.

Sun exposure and 25-hydroxyvitamin D3 levels in a community sample: Quantifying the association with electronic dosimeters

It is suggested that vitamin D status is increased by regular small sun exposures (<2 SEDEFB per week), and that greater exposures result in only small additional increases in 25(OH)D3.

Solar ultraviolet doses and vitamin D in a northern mid-latitude.

Sunlight and dietary contributions to the seasonal vitamin D status of cohorts of healthy postmenopausal women living at northerly latitudes: a major cause for concern?

SummaryWe assessed sunlight and dietary contributions to vitamin D status in British postmenopausal women. Our true longitudinal 25-hydroxyvitamin D (25(OH)D) measurements varied seasonally, being
...

Calculated Ultraviolet Exposure Levels for a Healthy Vitamin D Status

A standard vitamin D dose is defined on the basis of recently recommended requirements for vitamin D that take account of its risk reduction role in a variety of diseases, and a web-based tool is presented that enables the reader to calculate associated exposure times for any time and place using either default values or user-selected conditions.

Ultraviolet exposure scenarios: risks of erythema from recommendations on cutaneous vitamin D synthesis.

The model results show that the current recommended daily intake of 400 IU is readily achievable through casual sun exposure in the midday lunch hour, with no risk of erythema, and at the higher proposed vitamin D dose of 1000 IU lunchtime sun exposure is still a viable route to the vitamin, but requires the commitment to expose greater areas of skin.

Vitamin-D synthesis and metabolism after ultraviolet irradiation of normal and vitamin-D-deficient subjects.

Monitoring changes in serum concentrations of vitamin D and its metabolites, 25-hydroxyvitamin D (25-OH-D) and 1,25-dihydroxyv vitamin D (1,25-(OH)2-D), over a three-week period in normal subjects and vitamin-D-deficient patients found that exposure to .

Vitamin D and adult bone health in Australia and New Zealand: a position statement

Exposure of hands, face and arms to one‐third of a minimal erythemal dose (MED) of sunlight most days is recommended for adequate endogenous vitamin D synthesis, but deliberate sun exposure between 10:00 and 14:00 in summer (11:00–15:00 daylight saving time) is not advised.

Low vitamin D status despite abundant sun exposure.

Data suggest that variable responsiveness to UVB radiation is evident among individuals, causing some to have low vitamin D status despite abundant sun exposure, and it seems prudent to use this value as an upper limit when prescribing vitamin D supplementation.

Sunlight regulates the cutaneous production of vitamin D3 by causing its photodegradation.

Vitamin D3 proved to be exquisitely sensitive to sunlight, and once formed in the skin, exposure to sunlight resulted in its rapid photodegradation to a variety of photoproducts, including 5,6-transv vitamin D3, suPRasterol I, and suprasterol II.

Sun exposure and vitamin D sufficiency.

    B. Gilchrest
    Medicine
    The American journal of clinical nutrition
  • 2008
Medical and regulatory groups should avoid poorly reasoned, sensationalistic recommendations regarding unprotected ultraviolet exposure and rigorously explore possible cause-and-effect relations between vitamin D(3) status and specific diseases while advocating the safest possible means of ensuring vitamin D (3) sufficiency.

Fortification of orange juice with vitamin D: a novel approach for enhancing vitamin D nutritional health.

The fat content of milk does not affect vitamin D bioavailability and vitamin D fortification at 1000 IU/240 mL orange juice for 12 wk safely increased 25(OH)D(3) concentrations in adults.

Estimates of optimal vitamin D status

Based on the available evidence, it is believed that if older men and women maintain serum levels of 25(OH)D that are higher than the consensus median threshold of 75 nmol/l, they will be at lower risk of fracture.

Daily Duration of Vitamin D Synthesis in Human Skin with Relation to Latitude, Total Ozone, Altitude, Ground Cover, Aerosols and Cloud Thickness

From simulations of UV irradiances worldwide and throughout the year, the dependency of the extent and duration of cutaneous vitamin D production in terms of latitude, time, total ozone, clouds, aerosols, surface reflectivity and altitude is studied.