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[2] When used in supplementation, all of the vitamin B 12 vitamers have been argued to be beneficial, with there not being clear evidence that any are relatively more or less effective

This includes: Patients with malabsorption issues due to gastrointestinal disorders Individuals with pernicious anemia or other conditions that impair B12 absorption Cases where a rapid increase in B12 levels is necessary In these cases, IV delivery gets B12 straight into the blood

Other risk factors include certain gastrointestinal conditions, autoimmune conditions such as pernicious anaemia, long-term use of some medications, and increasing age

Verified Answer Once the bottle is opened, is there an expiration date

Send it back with the prepaid label and get results in just a few days

Both compounds share a proposed mechanism of action and are considered structurally similar