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Vitamin D is a group of secosteroids. Amounts in IU and μg and given throughout the article, but I only see one case that states which form it refers to (D3). At a guess they're all D3 but this should be explicit. According to this https://walrus.com/questions/converting-micrograms-mcg-of-calcitriol-to-international-units one IU of D3 is equivalent to one IU of D2, but it makes no sense to talk about an IU of calcitriol as no amount of it can be said to be equivalent to one IU of D3. The URL above does not look like a citable reference, despite looking very scholarly, so I won't edit the article, but someone more knowledgeable might want to, to say something like "all references to IU are to D3" and something similar for μg if that's true. Housecarl ( talk) 00:31, 9 December 2023 (UTC)
I What to add this two sections Production from sunlight and Absorption in the body from the sun. I have tried after best ability to follow WP:MEDRS.
To convey the difficulties, with getting vitamin D from the sun. And that getting vitamin D from sun/previtamin D is a different from supplement.
To produce Vitamin D, UVB light is required. To have sufficient light containing UVB, the UV index needs to be 3 or higher (≥45 solar zenith angle at sea level). [1] Vitamin D production is maximal at one-third of the minimal erythemal dose. When UV exposure increases to a minimal erythemal dose, vitamin D synthesis stops. [2] One must be south of latitude 50°N to produce vitamin D around the Winter solstice. [3]
SKIN REACTION TO SUNLIGHT | UV INDEX | ||||
---|---|---|---|---|---|
0-2 | 3-5 | 6-7 | 8-10 | 11+ | |
Skin type I:
Always burn, never tan |
56-∞ | 10-15 | 5-10 | 2-8 | 1-5 |
Skin type II:
Burn easily, rarely tan |
80-∞ | 15-20 | 10-15 | 5-10 | 2-8 |
Skin type III:
Occasionally burn, slowly tan |
90-∞ | 20-30 | 15-20 | 10-15 | 5-10 |
Skin type IV:
Rarely burn, rapidly tan |
140-∞ | 30-40 | 20-30 | 15-20 | 10-15 |
Skin type V & VI:
Very rarely burn, always dark |
180-∞ | 40-60 | 30-40 | 20-30 | 15-20 |
The table assumes that one is outdoors in sunlight for more than 3 times a week, wearing only swim trunks and a t-shirt or swimsuit, and has not applied sunscreen. Such exposure to the entire skin surface corresponds to receiving between 250–1250 μg of vitamin D (10k to 50k IU) per session [6], or a similar amount as obtained by consuming 125–500 ml of cod liver oil (200μg/100ml [7]).
The "summer level" decreases to "winter level" within 6 to 8 weeks after insufficient sun exposure, without supplementation. [8]
Vitamin D absorption from sunlight differs from absorption from supplements. [9] When absorbing 3 minimum erythema doses (the time it takes for the skin to turn red), with the whole body exposed to UV light:
The study does not mention the time it takes for serum 25-OH-D to return to its initial value.
In another study comparing the difference between 1 MED, 625μg D2 (25k IU) supplement, and 250μg D2 (10k IU) supplement [10] [11] [12] [13], they found that vitamin D from the sun lasts significantly longer than supplements. Vitamin D from supplements returned to baseline levels within 2 days, whereas vitamin D from the sun returned after 7 days. EidenNor ( talk) 08:02, 24 April 2024 (UTC)
References
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cite journal}}
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{{
cite web}}
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@ EidenNor:, per WP:MEDRS, secondary sources (review articles) and preferably recent reviews (less than five years old) are needed to support medical claims. Unfortunately most of the sources provided above are primary. The following are secondary, but more than ten years old. [1] [2] [3] Please refer to the banner on this talk page ("Ideal sources for Wikipedia's health content") for a link that will identify such sources. For the subject of vitamin D, there are thousands of such recent review articles. Thank you. Boghog ( talk) 05:51, 30 April 2024 (UTC)
References
This
level-5 vital article is rated B-class on Wikipedia's
content assessment scale. It is of interest to the following WikiProjects: | |||||||||||||||||||||||||||||||||||||||||||||||||||
|
Ideal sources for Wikipedia's health content are defined in the guideline
Wikipedia:Identifying reliable sources (medicine) and are typically
review articles. Here are links to possibly useful sources of information about Vitamin D.
|
The
contentious topics procedure applies to this page. This page is related to
COVID-19, broadly construed, which has been
designated as a contentious topic. Editors who repeatedly or seriously fail to adhere to the purpose of Wikipedia, any expected standards of behaviour, or any normal editorial process may be blocked or restricted by an administrator. Editors are advised to familiarise themselves with the contentious topics procedures before editing this page. |
Daily pageviews of this article
A graph should have been displayed here but
graphs are temporarily disabled. Until they are enabled again, visit the interactive graph at
pageviews.wmcloud.org |
This page has archives. Sections older than 30 days may be automatically archived by Lowercase sigmabot III when more than 4 sections are present. |
Vitamin D is a group of secosteroids. Amounts in IU and μg and given throughout the article, but I only see one case that states which form it refers to (D3). At a guess they're all D3 but this should be explicit. According to this https://walrus.com/questions/converting-micrograms-mcg-of-calcitriol-to-international-units one IU of D3 is equivalent to one IU of D2, but it makes no sense to talk about an IU of calcitriol as no amount of it can be said to be equivalent to one IU of D3. The URL above does not look like a citable reference, despite looking very scholarly, so I won't edit the article, but someone more knowledgeable might want to, to say something like "all references to IU are to D3" and something similar for μg if that's true. Housecarl ( talk) 00:31, 9 December 2023 (UTC)
I What to add this two sections Production from sunlight and Absorption in the body from the sun. I have tried after best ability to follow WP:MEDRS.
To convey the difficulties, with getting vitamin D from the sun. And that getting vitamin D from sun/previtamin D is a different from supplement.
To produce Vitamin D, UVB light is required. To have sufficient light containing UVB, the UV index needs to be 3 or higher (≥45 solar zenith angle at sea level). [1] Vitamin D production is maximal at one-third of the minimal erythemal dose. When UV exposure increases to a minimal erythemal dose, vitamin D synthesis stops. [2] One must be south of latitude 50°N to produce vitamin D around the Winter solstice. [3]
SKIN REACTION TO SUNLIGHT | UV INDEX | ||||
---|---|---|---|---|---|
0-2 | 3-5 | 6-7 | 8-10 | 11+ | |
Skin type I:
Always burn, never tan |
56-∞ | 10-15 | 5-10 | 2-8 | 1-5 |
Skin type II:
Burn easily, rarely tan |
80-∞ | 15-20 | 10-15 | 5-10 | 2-8 |
Skin type III:
Occasionally burn, slowly tan |
90-∞ | 20-30 | 15-20 | 10-15 | 5-10 |
Skin type IV:
Rarely burn, rapidly tan |
140-∞ | 30-40 | 20-30 | 15-20 | 10-15 |
Skin type V & VI:
Very rarely burn, always dark |
180-∞ | 40-60 | 30-40 | 20-30 | 15-20 |
The table assumes that one is outdoors in sunlight for more than 3 times a week, wearing only swim trunks and a t-shirt or swimsuit, and has not applied sunscreen. Such exposure to the entire skin surface corresponds to receiving between 250–1250 μg of vitamin D (10k to 50k IU) per session [6], or a similar amount as obtained by consuming 125–500 ml of cod liver oil (200μg/100ml [7]).
The "summer level" decreases to "winter level" within 6 to 8 weeks after insufficient sun exposure, without supplementation. [8]
Vitamin D absorption from sunlight differs from absorption from supplements. [9] When absorbing 3 minimum erythema doses (the time it takes for the skin to turn red), with the whole body exposed to UV light:
The study does not mention the time it takes for serum 25-OH-D to return to its initial value.
In another study comparing the difference between 1 MED, 625μg D2 (25k IU) supplement, and 250μg D2 (10k IU) supplement [10] [11] [12] [13], they found that vitamin D from the sun lasts significantly longer than supplements. Vitamin D from supplements returned to baseline levels within 2 days, whereas vitamin D from the sun returned after 7 days. EidenNor ( talk) 08:02, 24 April 2024 (UTC)
References
{{
cite journal}}
: Cite uses deprecated parameter |authors=
(
help)
{{
cite web}}
: Cite uses deprecated parameter |authors=
(
help)
@ EidenNor:, per WP:MEDRS, secondary sources (review articles) and preferably recent reviews (less than five years old) are needed to support medical claims. Unfortunately most of the sources provided above are primary. The following are secondary, but more than ten years old. [1] [2] [3] Please refer to the banner on this talk page ("Ideal sources for Wikipedia's health content") for a link that will identify such sources. For the subject of vitamin D, there are thousands of such recent review articles. Thank you. Boghog ( talk) 05:51, 30 April 2024 (UTC)
References