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[73] As noted above, the completely synthetic laboratory synthesis of B 12 was achieved by Robert Burns Woodward and Albert Eschenmoser in 1972, though this process has no commercial potential, requiring more than 70 steps and having a yield well below 0.01%
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If absorption is poor, taking more does not always solve the issue
Ozen OA, Cosar M, Sahin O, et al
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