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Garnett Cheney determined that there is a substance in fresh, raw cabbage juice that heals ulcers.
He called that substance Vitamin U.
If S-Methylmethionine has been proven to have no affect on ulcers, then why is S-Methylmethionine being referred to as Vitamin U in this article?
If it doesn't heal ulcers, it clearly isn't the substance Cheney called Vitamin U. —Preceding
unsigned comment added by
99.170.66.113 (
talk)
03:24, 2 August 2010 (UTC)
The primary problem is actually that Vitamin U redirects to S-Methylmethionine. It anything, it should redirect to Glutamine, not S-Methylmethionine. Though it really should just have its own article as it is unconfirmed which substance is Vitamin U. —Preceding
unsigned comment added by
99.137.21.103 (
talk)
20:29, 3 August 2010 (UTC)
"Chemical Formula: C6H15NO2S" quoted from : http://www.reciprocalnet.org/recipnet/showsample.jsp?sampleId=27343981 -- yohans
It would be a good idea to refocus this article on to the basic biochemistry of this cation (not a compound). There is extensive literature on this theme. The focus on vitamin U and Cheney G reads like an old-timey story, pioneering or not, that some might consider to be approaching fringe science. We want readers to see real biochemistry. I will continue to look for sources.-- Smokefoot ( talk) 23:45, 6 April 2011 (UTC)
A section that claimed radical SAM enzymes generate methyl radical was completely irrelevant to this article, since it seems no radical SAM enzyme is involved in synthesizing S-methylmethionine. The radical SAM mechanism is needed when the methyl group (donated by a different S-adenosylmethionine) is destined to attack an unactivated carbon, but it is not needed for SAM-dependent methyltransferase activity onto O, S, or activated C atoms.
Same chemical, different names Lesion ( talk) 12:38, 23 May 2013 (UTC)
I have read the article and the previous discussions on the talk pages, and I understand that there are some publications using this as a term for several chemicals, or for an unknown chemical. Please provide a reliable secondary source that supports such definitions. As it stands, we are using primary sources to over-rule the definitions given in secondary sources and this is not ideal. I am not saying that the definitions of vitamin U as a synonym of a single chemical are correct and the primary source supply a fringe definition/non mainstream/misuse of the term, but there is no proof that this is not the case with the current references. In my experience it is incredibly common for researchers to disagree with each other and use the same terms to mean different things. We are searching for the mainstream use of the term Vitamin U. This does not negate mention of other definitions of the term in the wikipedia article, but for such content we need secondary sources and they should be described with equal weight to the weight given them in the literature (see WP:CHERRY, WP:COI and WP:UNDUE). Primary sources should not be used to contradict secondary sources, especially reliable ones. Lesion ( talk) 18:05, 23 May 2013 (UTC)
Japanese brand of ulcer healing medicine Weisen-U seems to have this compound as its active. 213.1.22.216 ( talk) 02:01, 15 November 2016 (UTC)
![]() | This article is rated Start-class on Wikipedia's
content assessment scale. It is of interest to the following WikiProjects: | ||||||||||||||||||||
|
Garnett Cheney determined that there is a substance in fresh, raw cabbage juice that heals ulcers.
He called that substance Vitamin U.
If S-Methylmethionine has been proven to have no affect on ulcers, then why is S-Methylmethionine being referred to as Vitamin U in this article?
If it doesn't heal ulcers, it clearly isn't the substance Cheney called Vitamin U. —Preceding
unsigned comment added by
99.170.66.113 (
talk)
03:24, 2 August 2010 (UTC)
The primary problem is actually that Vitamin U redirects to S-Methylmethionine. It anything, it should redirect to Glutamine, not S-Methylmethionine. Though it really should just have its own article as it is unconfirmed which substance is Vitamin U. —Preceding
unsigned comment added by
99.137.21.103 (
talk)
20:29, 3 August 2010 (UTC)
"Chemical Formula: C6H15NO2S" quoted from : http://www.reciprocalnet.org/recipnet/showsample.jsp?sampleId=27343981 -- yohans
It would be a good idea to refocus this article on to the basic biochemistry of this cation (not a compound). There is extensive literature on this theme. The focus on vitamin U and Cheney G reads like an old-timey story, pioneering or not, that some might consider to be approaching fringe science. We want readers to see real biochemistry. I will continue to look for sources.-- Smokefoot ( talk) 23:45, 6 April 2011 (UTC)
A section that claimed radical SAM enzymes generate methyl radical was completely irrelevant to this article, since it seems no radical SAM enzyme is involved in synthesizing S-methylmethionine. The radical SAM mechanism is needed when the methyl group (donated by a different S-adenosylmethionine) is destined to attack an unactivated carbon, but it is not needed for SAM-dependent methyltransferase activity onto O, S, or activated C atoms.
Same chemical, different names Lesion ( talk) 12:38, 23 May 2013 (UTC)
I have read the article and the previous discussions on the talk pages, and I understand that there are some publications using this as a term for several chemicals, or for an unknown chemical. Please provide a reliable secondary source that supports such definitions. As it stands, we are using primary sources to over-rule the definitions given in secondary sources and this is not ideal. I am not saying that the definitions of vitamin U as a synonym of a single chemical are correct and the primary source supply a fringe definition/non mainstream/misuse of the term, but there is no proof that this is not the case with the current references. In my experience it is incredibly common for researchers to disagree with each other and use the same terms to mean different things. We are searching for the mainstream use of the term Vitamin U. This does not negate mention of other definitions of the term in the wikipedia article, but for such content we need secondary sources and they should be described with equal weight to the weight given them in the literature (see WP:CHERRY, WP:COI and WP:UNDUE). Primary sources should not be used to contradict secondary sources, especially reliable ones. Lesion ( talk) 18:05, 23 May 2013 (UTC)
Japanese brand of ulcer healing medicine Weisen-U seems to have this compound as its active. 213.1.22.216 ( talk) 02:01, 15 November 2016 (UTC)