Questions tagged [vitamins]

Questions regarding organic compounds required by an organism as a vital nutrient in limited amounts.

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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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57 views

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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407 views

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 there any evidence that Vitamin K-2 megadoses increase bicondylar, bizygomatic or bitemporal breadth in humans?

Can megadosing or supraphysiological dosing of Vitamin K2 (MK4; Menatetrenone) over prolonged periods of time cause an adult's bicondylar breadth, bizygomatic breadth or bitemporal breadth to grow ...
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369 views

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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606 views

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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90 views

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 they got their names?

There are several types of vitamins. A,B,C,D,E,H,K,P, etc. etc. So how they got 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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245 views

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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3answers
9k views

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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105 views

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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1answer
142 views

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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410 views

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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114 views

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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228 views

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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90 views

Are vegetables really needed in our diet?

I want to believe that eating vegetables is necessary even when one takes vitamins, but I can't find any medical evidence for this. To make my question specific, suppose a study on twins were done in ...
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359 views

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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Nutritious protein substance for vitamin enhanced crop?

I am not a bio or science major, but we have a subject, like an elective on biotechnology and we were tasked to think of a product that hasn't been invented yet. My groupmates and I thought of a ...
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The human organism knows what we have to eat? [closed]

My mother has told that if your organism needs a vitamin, you want fruits include that vitamin. For example you have lack of C-vitamin you would like to eat lemon. Is there any explanation for it, or ...
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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 ...
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Vitamins that could help “make us smarter”? [closed]

I was at Sprouts health store and saw a lot of vitamins/herbs that claimed to be "Study Aids" etc, so if there is any basis to it, where exactly does it hold truth? And are these supplements safe?
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Why can't you just take a vitamin? Why you need a healthy diet on top of that?

From what I understand, your body needs certain amounts of vitamins and minerals to maintain health. Why can't we just take enough pills to obtain these vitamins and minerals?
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Effects of having too much vitamin D?

I saw there was another question about vitamin D; however, I do not believe this is a repeat. What are some of the effects/side effects of having too much vitamin D in your body?
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Vitamin D oral intake, transportation and absorption

Several factors affecting vitamin D and its active form absorption and storage acidity of stomach (not significant effect) cytopathic effects of viruses cytopathic effects of bacteria where the last ...
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1answer
59 views

Do vitamins help our memory?

It is commonly believed that vitamins can help our memory. Is this really true? What is the biological basis of this? Is there any specific research paper on the subject?
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Why plants (eg. parsley) can keep vitamin C despite all the sun?

I have read that vitamin C is highly sensitive to light. So, how could parsley, for instance keep its vitamin C as it's flooded with sunlight?
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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 ...
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1answer
95 views

How essential is vitamin B3 to the diet?

I know this might seem contradictory since by definition a vitamin is an essential part of the diet but I have read that nicotinamide, a form of vitamin B3, can be synthesised from L-tryptophan. Is it ...
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In theory, would it be possible to create an injection of Vitamins, Minerals, sugars etc so that eating was no longer necessary?

I am wondering, out of pure curiosity, whether with current medical & biological science, (or indeed with accepted probable future developments in those areas), in theory, would it be possible to ...
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2k views

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?
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Distribution of nutrients throuought a drink made of plants?

In an attempts to eat my veggies for the day in one shot, I blended together a bag of salad with some water. The mixture separated by density, a thick top layer containing the bits of leaves, and a ...
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Can the Human body Synthesise Vitamin D from Phytosterols?

I know that the human body can synthesise vitamin D from cholesterol, but can it do so from phytosterols?