7
votes
Accepted
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 ...
- 6,918
6
votes
Accepted
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 ...
- 15.9k
6
votes
Accepted
How much Vitamin D does the body produce if you're out for 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 ...
- 2,270
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 ...
- 15.9k
5
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 ...
- 6,930
5
votes
Accepted
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 ...
- 13.3k
5
votes
Accepted
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.
...
- 382
4
votes
Accepted
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 ...
- 15.9k
4
votes
Accepted
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):
...
- 15.9k
3
votes
Why are babies in France recommended to consume 3x as much vitamin D compared to babies in the USA?
The official guidelines in France have recently been updated (my question dates back to December 2020).
The report "Les références nutritionnelles
en vitamines et minéraux", Avis de l’Anses, ...
3
votes
Accepted
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 ...
- 209
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 ...
- 13.3k
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 ...
- 201
2
votes
Accepted
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 ...
- 250
2
votes
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 ...
- 31
2
votes
Accepted
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-...
- 392
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 ...
- 6,930
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 ...
- 488
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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Only top scored, non community-wiki answers of a minimum length are eligible