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Albert Jakob Eschenmoser (5 August 1925 – 14 July 2023) was a Swiss organic chemist, best known for his work on the synthesis of complex heterocyclic natural compounds, most notably vitamin B 12. In addition to his significant contributions to the field of organic synthesis, Eschenmoser pioneered work in the Origins of Life (OoL) field with ...
The structure of vitamin B 12 was the first low-molecular weight natural product determined by x-ray analysis rather than by chemical degradation. Thus, while the structure of this novel type of complex biomolecule was established, its chemistry remained essentially unknown; exploration of this chemistry became one of the tasks of the vitamin's chemical synthesis.
Animals store vitamin B 12 from their diets in their livers and muscles and some pass the vitamin into their eggs and milk. Meat, liver, eggs, and milk are therefore sources of the vitamin for other animals, including humans. [62] [2] [77] For humans, the bioavailability from eggs is less than 9%, compared to 40% to 60% from fish, fowl, and ...
Many pharmacy chains in the United States are owned and operated by regional supermarket brands, or national big-box store brands such as Walmart. These pharmacies are located within their larger chain stores. The three largest free-standing pharmacy chains in the United States are Walgreens, CVS, and Rite Aid.
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The efficacy of methylcobalamin administration in treating vitamin B12 deficiency remains uncertain. While directly providing active cobalamin forms to deficient patients is an attractive approach promoted by the manufacturers of methylcobalamin products, it is not known whether methylcobalamin can reach its intracellular targets in its ...