Search results
Results from the WOW.Com Content Network
For the most part, vitamins are obtained from the diet, but some are acquired by other means: for example, microorganisms in the gut flora produce vitamin K and biotin; and one form of vitamin D is synthesized in skin cells when they are exposed to a certain wavelength of ultraviolet light present in sunlight.
Vitamins can serve as precursors to many organic cofactors (e.g., vitamins B 1, B 2, B 6, B 12, niacin, folic acid) or as coenzymes themselves (e.g., vitamin C). However, vitamins do have other functions in the body. [29] Many organic cofactors also contain a nucleotide, such as the electron carriers NAD and FAD, and coenzyme A, which carries ...
The report adds: "The stability of vitamin C (L-ascorbic acid) is of concern because this is one of the most labile vitamins in foods. Its main loss during processing and storage is from oxidation, which is accelerated by light, oxygen, heat, increased pH, high moisture content (water activity), and the presence of copper or ferrous salts.
Most vitamins are considered safe for up to two years past their expiration date (unless they contain mold), but may become less potent over time. ... Pregnant women and people in need of regular ...
Vitamins occur in a variety of related forms known as vitamers. The vitamers of a given vitamin perform the functions of that vitamin and prevent symptoms of deficiency of that vitamin. Vitamins are those essential organic molecules that are not classified as amino acids or fatty acids.
Vitamin B 12 is the most chemically complex of all vitamins, [6] and for humans the only vitamin that must be sourced from animal-derived foods or supplements. [2] [7] Only some archaea and bacteria can synthesize vitamin B 12. [8] Vitamin B 12 deficiency is a widespread condition that is particularly prevalent in populations with low ...
Colin Dunn/Flickr. Vitamin D isn't present in most of the foods we eat, but it's a critical ingredient that keeps our bones strong by helping us absorb calcium. Getting sunlight helps our bodies ...
B-vitamins are primarily found in animal-based foods, making deficiencies more common among those with limited animal food intake due to cultural, religious, or economic reasons. For vegetarians, fortified foods can be a viable alternative to ensure adequate vitamin B12 levels, especially when reducing laxative use to improve absorption.