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Direct sale of Health Products, Items, Tools

Buy, Sell , Auction  Vitamins Supplies



Vitamin A



K2



B12



beta-carotene.

B Complex

C

chewable-c

Multivitamins

c-microcapsule

D

D3

Dhea

Vitamin E

 

multi-prenatal

 

vitamin-wate

 

b6-melatonin

 

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vitamin is a nutrient that is an organic compound required in tiny amounts for essential metabolic reactions in a living organism.[1] Most vitamins cannot be obtained in sufficient quantities by synthesis in the body, and therefore must be obtained from the diet. Thus, the term is conditional on the circumstances and the particular living organism. For example, ascorbic acid functions as vitamin C for some animals but not others, and vitamins D and K are required in the human diet only in certain circumstances.[2] Vitamins are defined by their biological activity, not their structure. Thus, each "vitamin" actually refers to a number of vitamer compounds, which form a set of distinct chemical compounds that show the biological activity of a particular vitamin. Such a set of chemicals are grouped under an alphabetized vitamin "generic descriptor" title, such as "vitamin A," which (for example) includes retinal, retinol, and many carotenoids. [3] Vitamers are often inter-convertible in the body. The term vitamin does not include other essential nutrients such as dietary minerals, essential fatty acids, or essential amino acids, nor does it encompass the large number of other nutrients that promote health but that are not essential for life.

Vitamins have diverse biochemical functions, including function as hormones (e.g. vitamin D), antioxidants (e.g. vitamin E), and mediators of cell signaling and regulators of cell and tissue growth and differentiation (e.g. vitamin A) [4]. The largest number of vitamins (e.g. B complex vitamins) function as precursors for enzyme cofactor bio-molecules (coenzymes), that help act as catalysts and substrates in metabolism. When acting as part of a catalyst, vitamins are bound to enzymes and are called prosthetic groups. For example, biotin is part of enzymes involved in making fatty acids. Vitamins also act as coenzymes to carry chemical groups between enzymes. For example, folic acid carries various forms of carbon group – methyl, formyl and methylene - in the cell. Although these roles in assisting enzyme reactions are vitamins' best-known function, the other vitamin functions are equally important.[5]

Until the 1900s, vitamins were obtained solely through food intake, and changes in diet (which, for example, could occur during a particular growing season) can alter the types and amounts of vitamins ingested. Vitamins have been produced as commodity chemicals and made widely available as inexpensive pills for several decades,[6] allowing supplementation of the dietary intake.

Calcium Ascorbate (119)
Ester-C (623)
K-Mag (17)
Multivitamins (3,558)
Vitamin A (436)
Vitamin B (3,729)
Vitamin C (2,474)
Vitamin D (197)
Vitamin E (2,675)
Vitamin K1 (53)
Vitamin O (29)
 

 

 

Vitamin B4 Adenine DNA metabolite
Vitamin B8 Adenylic acid DNA metabolite
Vitamin F Essential fatty acids Needed in large quantities (does
not fit the definition of a vitamin).
Vitamin G Riboflavin Reclassified as Vitamin B2
Vitamin H Biotin Reclassified as Vitamin B7
Vitamin J Catechol, Flavin Protein metabolite
Vitamin L1[32] Anthranilic acid Protein metabolite
Vitamin L2[32] Adenylthiomethylpentose RNA metabolite
Vitamin M Folic acid Reclassified as Vitamin B9
Vitamin O Carnitine Protein metabolite

 

 














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