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However, pharmacokinetic studies have shown methylcobalamin stays longer in brain and liver tissues

The marketing claim that B12 "boosts metabolism" is technically true in the context of correcting a deficiency, since B12 is essential for energy metabolism, but only applies if you are actually deficient

It is common for those who follow vegetarian or vegan diets to be vitamin B12 deficient the majority of the population relies on the consumption of meat in order to maintain a healthy level of vitamin B12

IF YOU FEEL YOU MAY BE B12 DEFICIENT PLEASE SEEK MEDICAL ADVICE FROM YOUR DOCTOR WHO WILL BE ABLE TO DO SOME FURTHER INVESTIGATEATIONS)