Questions regarding organic compounds required by an organism as a vital nutrient in limited amounts.
Questions tagged [vitamins]
70 questions
75
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Why do Humans not produce Vitamin C like other mammals?
Why do most mammals produce their own Vitamin C?
Why do Humans not?
Gabriel Fair
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Can vitamin B17 cure cancer?
I have heard that a 'vitamin B17' can cure cancer, but that the medical industry never talks about it, since making it legal would cause them loss of billions. But I have never found a reliable report on whether B17 really works or not. There is a…
superbug
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Did neanderthals need vitamin C from the diet?
Modern humans need to get vitamin c from the diet, because we do not make it ourselves. Did neanderthals produce vitamin c? At what point of evolution exactly was this ability lost?
Euphorbium
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Is cancer caused by vitamin B17 deficiency?
I have read in an article on the internet that cancer is caused due to deficiency of vitamin B17 which has been removed from our diets long ago in the western food. But some people say that vitamin B17 does not work. So, is it deficiency of vitamin…
user237650
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How can haired mammals synthesize vitamin D?
The human body can synthesize vitamin D in the skin from cholesterol, when sun exposure is adequate. But how can haired mammals do it? Do not they need it?
cesargastonec
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How is vitamin B12 stored in the body although it is water-soluble?
Vitamin B12 is stored in the liver for a long time.
How is it stored?
San
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Why do Arctic predators accumulate vitamin A?
Top predators in the Arctic are known to accumulate vitamin A, often to levels that are toxic for human consumption. A 2012 study by Senoo, Imai, et al. found that the livers of several predator species in the Arctic showed much higher levels of…
augurar
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Pasteurisation of orange juice and Vitamin C
In the UK at present, one of the examination boards has set a "controlled assessment" (an experiment that pupils do at school under exam conditions) that involves testing a hypothesis that vitamin C is removed from fruit juice by heating it (i.e. in…
ProfRob
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Counterintuitive action of Vitamin D?
Vitamin D acts in a way which to me is counterintuitive. It functionally supplemets Parathormone. It in the intestinal tract steps up calcium absorption by altering nuclear gene expression and also prevents calcium excretion in kidneys. All of this…
stochastic13
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How is a substance classified as a vitamin?
From wikipedia
A vitamin is an organic compound and an essential nutrient that an organism requires in limited amounts.
There are many essential nutrients to an organism. Glucose for example. However, not all of them are classified as vitamins. Is…
jong-hyeon-yeo
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Functionality of vitamin A, Bx, C, D, E, K as used in cosmetics for the skin?
I was wondering if someone can compare the functionality of vitamin A, Bx (x means numbers, such as 1, 2, 3, ...), C, D, E, K in the skin? They are used in cosmetics but what is their actual effect?
If there is some source that compares between…
Tim
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Are there any effects of elevated Cysteine levels on cognitive function?
I'm looking at this diagram of homocysteine metabolism and see two distinct pathways that the amino acid may get metabolized to: with vitamin B12 it gets converted back into methionine, while with B6 it gets converted to cysteine.
I've followed the…
Alex Stone
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Is it possible for a substance to be absorbed by the hair or the scalp?
I've heard that the aplication of Monovin A in the hair would allow it to grow faster. Monovin A seems to be only A vitamin, according to the first website.
Could the application of A vitamin in the hair make it grow?
I'm thinking it's not very…
Red Banana
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Can the absorption of vitamins be enhanced?
Are food additives like vitamins better absorbed when you mix them among fruits?
I heard that secondary substances in fruit promote the absorption.
draks ...
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What vitamins exist for other animals but not humans?
As you probably know, humans are among the minority of animals that require Vitamin C and don't produce it ourselves. For whatever reason (multiple theories exist), we lost the ability. Meanwhile, the vast majority of animals out there that require…
TheEnvironmentalist
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