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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%
Anecdotal evidence does not show any immediate adverse effects
Subcutaneous injection means under the skin, with the root ''sub-'' meaning beneath, and ''cutaneous'' pertaining to the skin
Y.QuM.DuanR.ShiD.JinL.GaoJ.et al (2019)
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