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Adults get 1000 mcg of vitamin B12 intramuscularly once a week
[131] [132] Species from the following genera and the following individual species are known to synthesize B 12 : Propionibacterium shermanii , Pseudomonas denitrificans , Streptomyces griseus , Acetobacterium , Aerobacter , Agrobacterium , Alcaligenes , Azotobacter , Bacillus , Clostridium , Corynebacterium , Flavobacterium , Lactobacillus , Micromonospora , Mycobacterium , Nocardia , Proteus , Rhizobium , Salmonella , Serratia , Streptococcus and Xanthomonas
Beyond this period, the efficacy of the benzyl alcohol preservative may diminish, increasing the risk of microbial growth
HCG doesnt let it happen by the mentioned progesterone production procedure until the placenta is formed, and commands progesterone production