Questions tagged [vitamins]

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

11 questions with no upvoted or accepted answers
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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?
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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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130 views

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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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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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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860 views

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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70 views

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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108 views

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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How much myrosinase do mustard sprouts contain?

It is known that ground mustard seeds contain active myrosinase, but what about soaked or sprouted mustard seeds?
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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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92 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 ...