B12 is the Biggest and Most Complex Vitamin by Far
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B12 is 3 times bigger than the next biggest vitamin (vit K) and 11 times bigger than the smallest (nicotinic acid or B3). It took an international collaboration of 19 countries, 103 scientists (from Harvard and the Swiss Institute of Technology) 12 years to synthesize it in 62 chemical steps. It is the most complex vitamin by far - it must be important.
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