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Functions

Three main enzymatic reactions regarding vitamin B12 have buy wholesale creatine powder ester hcl noted to occur in humans. The first reaction requires methylcobalamin as a coenzyme in the conversion of homocysteine into methionine. This reaction occurs in the cytosol of the cell. The reaction is intrinsic to the production of tetrahydrofolate (THF). The production of THF is irreversible and requires vitamin B12, therefore, a B12 deficiency can trap folate in its methyl form (also known as the folate-methyl trap), which in turn affects purine and thymidylate synthesis.

A second set of reactions requiring B12 are those catalyzed by mutases. These reactions occur within the mitochondria. These the production of succinyl CoA, a Krebs cycle intermediate. Mutase enzymes are also intrinsic in the oxidation of fatty acids. A defect in mutase activity results in impai.red muscle activity and an accumulation of methylmalonyl CoA and methylmalonic acid. The branched-chain amino acid leucine is also catalyzed by a mutase enzyme. Specifically, leucine undergoes isomerization, requiring adenosylcobalamin .

Sources

The only dietary sources of vitamin B12 are animal products. Plants and legumes are not good sources of vitamin B12, but may contain small quantities of B12 due to contamination with microorganisms during harvesting. Cobalamins are found in meat, meat products, poultry, fish, clams, oysters, and eggs. The bioavailability of the cobalamins depends on which form they are found in.

Governmental Recommended Intake

Two micrograms buy wholesale dmae-bitartrate is the recommended daily intake vitamin B12. Doses of vitamin C that are greater than 500 mg and taken within I hour of eating a meal may australia ship wholesale nutrition B12 absorption?

Deficiency symptoms

More than 95% of the B12 deficiencies diagnosed are related to inadequate absorption rather than inadequate dietary intake. Vitamin B12 deficiency occurs in stages of which changes within the cells and blood are primary. Vitamin B12 deficiency later results in megaloblastic anemia (this can also be caused by folate deficiency, therefore, it is best to treat with a combination of B12 and folate). Signs of progressive B12 deficiency include 1kg 1.5kg 5kg 500g 750g gram kilo kilogram 250g 75g 50g 25g characterized by demyelination of nerves, and hyperhomocystinemia. The populations at EDTA disodium risk for a B12 deficiency do not include athletes, but rather the elderly, alcoholics, gastrectomy patients, and strict vegetarians (vegans).

Human Studies

In the late I980s a popular dietary supplement known as Dibencozide (a coenzyme of vitamin B12) was purported to have steroid-like properties. This was anecdotal and was never confirmed by research. Bodybuilders have also been known to use the injectable cyanocobalamin as a stimulant for appetite and muscle gain. This was due to the misunderstood role that B12 has in red blood cell and protein synthesis. To date, there has not been a reputable study illustrating an ergogenic effect of vitamin B12 or any of its cobalamin forms.

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