11 votes
Accepted

What needs to be exposed for the body to produce Vitamin D?

Vitamin D is produced in the skin, not the eyes.(1) I would imagine that when those indigenous peoples were introduced to sunglasses, they were also introduced to a number of other items they had ...
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  • 9,324
11 votes

Do we produce Vitamin D in the shade?

The exact value depends on a lot of things - skin tone, the time of day, latitude, how deep the shade is,... The study Vitamin D effective ultraviolet wavelengths due to scattering in shade found ...
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  • 6,998
7 votes

Do we produce Vitamin D in the shade?

About 1/4 - it varies with the reflectivity of the surface, and angle of the sun. Detailed study is at http://www.ncbi.nlm.nih.gov/pubmed/20199222
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6 votes

Is there a relationship between vitamin D levels and cholesterol?

According to a couple of systematic reviews of studies, there is insufficient evidence about the lowering effect of vitamin D on blood cholesterol levels. Vitamin D, Evidence Mayo Clinic (data from ...
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  • 15.6k
6 votes
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Does vitamin D synthesis occur in indirect sunlight?

The sunlight through the window does not stimulate vitamin D synthesis in the skin. Sunlight and Vitamin D (PubMed): Since glass absorbs all UVB radiation, exposure of the skin to sunlight that ...
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  • 15.6k
5 votes
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General Population Low Vitamin D Levels

There are a few mechanisms at work that influence the vitamin D status for Europeans. Vitamin D is either eaten in the food, created with the help of sunlight or supplemented. Many appear to net have ...
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  • 6,757
5 votes
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To what degree does a Vitamin D course mitigate the effects of Primary Hyperparathyroidism?

If you see a low vitamin D level in conjunction with a raised PTH level, then I think you need to think secondary hyperparathyroidism (HiPTH). But since vast numbers of most western populations have ...
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  • 13.2k
5 votes
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Do UV-B emitting lamps for reptile pets produce vitamin-D in human skin?

In short: UV bulbs for reptiles and tanning beds emit mainly UV-A, which does not promote vitamin D synthesis but can promote skin cancer. UV light and vitamin D synthesis (Skin Cancer Foundation): ...
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  • 15.6k
4 votes
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Does the damage from sun exposure outweigh the benefit of getting vitamin D?

I like your curiosity and logical thinking - you're just missing a few pieces of the puzzle. The sun emits ultraviolet light radiation which is the component of sunlight that is able to damage skin. ...
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  • 362
4 votes
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Do Elderly benefit from Vitamin D supplements?

According to some studies, adequate vitamin D intake from foods and supplements may prevent bone weakness (osteporosis) in elderly, but according to others it may not. Efficacy of optimization of ...
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  • 15.6k
4 votes

Does the use of sunscreen inhibit Vitamin D production?

This has been a controversial question for many years. The current evidence suggests that sunscreen does block a part of Vitamin D production, but with negligible amounts. Studies have found that ...
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  • 6,480
4 votes
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How much Vitamin D does the body produce if you are outdoors a whole summer day?

Vitamin D is produced in the skin by UV irradiation of 7-dehydrocholesterol. But vitamin D in the skin is also broken down by UV irradiation and this leads to a maximum equilibrium level of vitamin D ...
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  • 2,228
3 votes
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Are there any symptoms of Vitamin D deficiency?

WebMD Signs and Symptoms of Vitamin D deficiency can be subtle, but can manifest as bone pain and muscle weakness. Also, excessive sweating(when not indicated due to exercise level and heat). ...
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  • 2,952
3 votes
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Why vitamin D3 is deficient in children and the elderly?

Vitamin D is not strictly a vitamin, rather it is the precursor of one of the hormones involved in the maintenance of calcium homeostasis and the regulation of cell proliferation and ...
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2 votes
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What type of liver is richest in Vitamin D?

The older the animal, the greater the amount of vitamin D stored in the liver. While liver is a somewhat good source of vitamin D, it's also very high in vitamin A. A person eating liver more often ...
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  • 250
2 votes

Does the use of sunscreen inhibit Vitamin D production?

In addition to the other answers: [C]linical studies have never found that everyday sunscreen use leads to vitamin D insufficiency. In fact, the prevailing studies show that people who use sunscreen ...
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  • 191
2 votes

When is vitamin D released from fat?

It is already released in winter, and may help prevent very low levels that might otherwise be obtained. Vitamin D Stored in Fat Tissue During a 5-Year Intervention Affects Serum 25-Hydroxyvitamin ...
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  • 13.2k
2 votes

Do UV-B emitting lamps for reptile pets produce vitamin-D in human skin?

I don’t know if they can be used, but they shouldn’t. Recently, sun exposure is considered more and more harmful to the skin. This is why for recommended Vitamin D levels, no sun exposure whatsoever ...
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  • 6,480
2 votes
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Is it useless to drip Vitamin D drops on your tongue?

It appears that Vitamin D oil drops are just as effective as tablets. Well they have the oil which helps the Vitamin D absorb since D is fat soluble I guess. https://vitamindwiki.com/tiki-...
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  • 402
1 vote

What is the best natural source of Vitamin D (excluding sun)?

The two major forms [of vitamin D] are vitamin D2 and vitamin D3. Vitamin D2 (ergocalciferol) is largely human-made and added to foods, whereas vitamin D3 (cholecalciferol) is synthesized in the skin ...
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  • 473
1 vote

Why would you take Vitamin D twice a week instead of once a day?

Medication can come in not only varying doses, but also the release time can vary. For instance, if you have a painkiller and you want it to work for a long period of time, you can coat it with ...
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  • 21
1 vote

How long does it take to beat vitamin D deficiency

Ideally, people should get enough vitamin D from their food. However, that's difficult to do, Many folks don't get enough of the nutrient from dietary sources like fatty fish and fortified milk. Ref: ...
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1 vote

Are there any symptoms of Vitamin D deficiency?

Vitamin D deficiency can actually cause or exacerbate depression, and it can manifest itself in feelings of tiredness, persistent sadness, weakness, etc... It also prevents your bones from ...
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