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Effects seen after administration: Vitamin B12 Injection Shows Quick Effects.-Picture Courtesy: The Well Dog Place Vitamin b12 when given as oral supplement, it takes time to reach systemic circulation thats why it takes time to show effects after administration

Fortunately, as our understanding of this remarkable vitamin has increased, debilitating or deadly vitamin B 12 deficiency is relatively rare today

Indeed, while some estimates find that the development of new drugs might take around 1315 years with an overall investment of around US$ 1.33 billion to bring one drug to the market, it has been proposed that drug repurposing might allow to save 57 years, reduce the cost to around US$ 300 million per molecule, and the risk of failure from more than 95% for newly-designed drugs to around 45% for a repurposed one (Nosengo, 2016

In other cases, the strategy encompasses the engineering of enzymes so as to modify some key metabolites and, thus, modify oxygen release and/or other metabolites