Questions tagged [vitamins]
Questions regarding organic compounds required by an organism as a vital nutrient in limited amounts.
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Can the poor uptake of bloodstream nutrients (due to DNA mutations for example) occur at the cellular level?
Due to DNA mutations can some cells within your body not be capable of effectively taking-up the available proteins/vitamins/minerals/etc. from within your bloodstream?
Within haematology the term &...
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Is there any risk for oranges to lose vitamin C
My understanding is that vitamin C easily undergoes oxidation. But for that to happen, the vitamin C has to be in contact with oxygen, e.g. with air. Therefore an orange doesn't start losing its ...
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Meaning of "offsetting the adverse kinetics from the altered glutamate decarboxylase binding capacity" in a paper
From the review titled "Pyridoxine-Dependent Epilepsy and Antiquitin Deficiency Resulting in Neonatal-Onset Refractory Seizures":
It is suggested that sudden, severe cerebral suppression ...
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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?
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Where in the biological realm is vitamin B5 chiefly produced?
Can yeast produce pantothenic acid (vitamin B5)?
Do bacteria efficiently produce it?
Or does it only come from plants?
The Wikipedia page for pantothenic acid doesn’t seem to answer the question (...
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vitamin D in mushrooms
How could I test vitamin D levels in mushrooms? (I am a high school student, our lab is pretty modern, but my resources are limited)
I found an article about it (https://www.hindawi.com/journals/jfq/...
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How is Vitamin D deficiency linked to multiple sclerosis? [closed]
Numbness and tingling in various parts of the body can be linked to the deficiency if vitamin D in one's diet. Also, multiple sclerosis has Vitamin D deficiency as one of its risk factors. How exactly ...
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Vitamin B12 deficiency Megaloblastic anemic
I have two doubts regarding Megaloblastic anemia which shakes my mind
(1) first is- I know that vitamin B12 is required for thymidine synthesis which is further required for DNA synthesis and so if ...
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Why does more melanin means harder vitamin D production if melanocytes lie deeper in the skin than keratinocytes?
From my Googling, I understand that keratinocytes are primarily responsible for generating vitamin D from UV rays, and melanocytes are for producing melanin to block UV rays. However in lots of skin ...
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Does Topiramate work by supplanting Pyridoxal phosphate in enzymes?
I have seen it said that the precise mechanism of action of migraine medicine Topiramate is not known. But I certainly see a resemblance between that molecule and PLP (Pyridoxal phosphate, the ...
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What happens to intrinsic factor exactly at the terminal ileum, where B12 is absorbed?
IF is very important for IF-dependent B12 absorption in the terminal ileum, the mechanism by which most of dietary B12 is absorbed. The B12-IF complex bind to IF receptors on enterocytes, but does the ...
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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 ...
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A question about dicumarol
I know that dicumarol was discovered in moldy sweet clover as it caused hemorrhage in cattles, but if someone had thromboembolic disorders causing uncontrolled thrombosis,would it be fine to eat moldy ...
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What's unique for vitamin B-12 group?
I've been trying to figure out what makes the vitamin B group really big with 8 vitamins.
Chemically they have different structures.
Solubility: not only vitamins from this group are water soluble ...
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Do pyrocalciferol and isopyrocalciferol form in vertebrate skin?
I heard that pyrocalciferol and isopyrocalciferol can only be formed above 100°C/212°F, yet some images in the web depict them as forming in vertebrate skin. So, I wonder if pyrocalciferol and ...
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Do vitamin enriched foods preserve their value when exposed to higher temperatures?
At what temperatures do different kinds of vitamins are destroyed or lose their nutritional value?
Imagine you went to the store and bought vitamin enriched cacao powder. Then you made yourself a hot ...
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Does vitamin D affect melanin concentration?
I am aware of the affect on vitamin D production by melanin (in sunlight) but I can not find any information regarding a reverse connection.
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How does the inability to produce vitamin C helped weight gain?
I recently wondered how do dogs cope without vitamin C intake like us.
A few Wikipedia pages later, I learned that our dry-nosed ancestors lost about two-thirds of the gene responsible for vitamin C ...
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What does the number after Vitamin B signify?
Does the number after Vitamin B signify anything? For example what is the significance of 12 in Vitamin B12?
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Why does B12 deficiency enlarge red blood cells?
I'd like to know why B12 deficiency enlarge red blood cells
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Is it possible that there are unknown vitamins?
Is it possible that there are vitamins or other essential nutrients about which we still do not know?
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Question about vitamin b6 product and cycling
Can the b6-product of a vitamin b6 reaction such as transaminase be recycled back to active vitamin b6 in man, and if so by means of what reaction?
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Is vitamin D a vitamin or a hormone?
Some people like to say that vitamin D is a hormone.
A simple set of differences between hormones and vitamins is described here.
Vitamin D is not (for the most part) absorbed through food but ...
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Is there a correlation between B12 deficiency and cardiovascular disease?
I've read in several health sites that state that high blood homocysteine, as well as low B12 intake, is not only correlated, but actually causes cardiovascular diseases. In order to verify those ...
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How long does it take for Vitamin D3 to have physiological effect
As far as I understand Vitamin D3 has no direct physiological effect but has to be first converted. If a person if given a mega-dosis. (50000-200000 IU) of Vitamin D3, how long does it take till the ...
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Is the serum concentration of calcitriol different at different times in the day?
Given that calcitriol has a relatively short half-life in adults it would be possible that the serum concentration is at different times of the day different if it gets produced in different ...
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Microbiome Context for Amino Acid Essentials and Non-Essentials
Given what we are now learning about the diverse mix and variance of microbiomes (aka bacterias via human gut project), is it possible that synthesis of aminos can be done by specific bacteria and ...
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Effect of heat-treatment of Vitamin C
When it is in the body, does it matter if vitamin C has peviously been heat-treated? Can the body still use it?
For instance, if vitamin C is added to 90 degree celsius water does it matter if you ...
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Do You Need Vitamin B12 To Utilize Folate
Just wondering if Vitamin B12 is necessary for the body to utitlize folate. My husband is on Methotrexate for rheumatoid arthritis, a medicine which is known to destroy folate. The doctors therefore ...
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Vitamins — how did they get their names?
There are several types of vitamins. A,B,C,D,E,H,K,P, etc. How did they get their names?
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Is there enough vitamin B12 in lakes, rivers and ponds, for humans not to need to take supplements?
Vegans will often say that having an animal-free diet is best for our health and is actually the diet that humans should be eating to function optimally. To which meat eaters will raise the issue of ...
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Blue light in a fridge. Is it really beneficial or just marketing?
Recently while visiting a shop with electronics I saw a fridge with a huge advertisment sticker going more or less like this:
There's blue light source in this fridge so there will be less bacteria ...
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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. ...
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How many almonds a day can cause toxicity for vitE?
Vit E in high doses is dangerous for tissue. How many almonds a day taken regularly can cause this?
RDA
Males : 10mg/day
Females : 8mg/day
Pregnancy : 10mg/day
Lactation : 12mg/day
15 mg = 33IU for ...
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Nutrition mineral intake method
I always wonder if rather than getting minerals from food, can I directly eat them and will they have same effect as in food,
e.g. can I eat iron filings for iron, magnesium and drink hard water for ...
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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 ...
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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?
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How does vitamin A deficiency arise?
How does vitamin A deficiency arise?
I am living in a "developed" country, so excuse me if I miss some facts
that are real, and threatening, in other parts of our world.
I heard about https://en....
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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 ...
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How much does the Vitamin D3 concentration of the blood of a human change over the course of a day?
Are there studies that measured how much the blood concentration of Vitamin D3 changes over the course of a day? If so, how strongly does it change? Does it change in predictable patterns?
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Use of sunlight in biological processes
Sunlight is used by green plants in photosynthesis, but it is also used by animals in the synthesis of Vitamin D. Are there any similarities between the two processes and how is the light energy ...
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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 ...
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Does vitamin C decrease after reacting with oxygen free radicals?
From the research that I have done, I know that antioxidants such as vitamin c donate electrons to oxygen free radicals and effectively neutralize them. They themselves do not become free radicals as ...
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What is the definition for vitamins?
I have found the following definition on Wikipedia:
An organic chemical compound (or related set of compounds) is called a
vitamin when the organism cannot synthesize the compound in sufficient
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Do vitamins protect you from common cold? [closed]
Do vitamins (taken as pills) boost your immune system, and make you less likely to contract diseases such as common cold or flu?
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Why do provitamins-A do not cause Vitamin-A toxicity?
Why do beta-carotene and other provitamins like alpha-carotene not cause vitamin-A toxicity but rather carotenosis (Orange skin) whereas retinal, retinol, and retinoic acid cause vitamin A toxicity ...
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Rampant low Vitamin D
Why have people inadequate vitamin D status? Is it just (the lack of) sun exposure, or is it related to hormone and thyroid function?
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How could 45 milligrams of a substance equal 4,500 micrograms? [closed]
In this book, the author repeatedly states that 45 milligrams of vitamin K2 equals 4,500 micrograms. I thought 1 mg = 1000 mcg. How could this be?
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Were we able to create vitamin B12 in past?
All herbivores produce vitamin B12 de novo. Gorillas, for example, are "vegans" so I suppose some human ancestor was also herbivore.
Have we ever been B12 self-producers? If so, why have we lost that ...
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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.
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