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FAQs What type of B12 is used for injections in the UK
[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%
Produced to pharmaceutical standards (e.g., by Hospira, a Pfizer subsidiary), it comes in 30 mL multiple-dose vials with semi-rigid polyolefin construction designed for repeated needle punctures while maintaining seal integrity
Effects can be felt within hours to a day , depending on individual metabolism
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