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Historical withdrawal studies reported headache, nausea, vertigo and episodes of hypotension

see Vitamin B12 Health Professional Fact Sheet

You need to get your recommended daily intake of 2.4 micrograms (mcg) per day (1) from food, oral supplements, or injections

Therefore, staying proactive about your energy needs allows you to remain active and fully engaged with your lifestyle goals

Some of these components, such as E1-activating enzymes, are conventional enzymes and are therefore potentially amenable to drug development, whereas other components of the system are non-conventional targets for which extensive work will be required to assess their suitability as drug targets