the only type of organisms that have the enzymes required for the synthesis of methylcobalamin are bacteria and archaea
High-dose oral B12 supplements are available over the counter for a few dollars per month, while injection visits typically involve copays, administration fees, and the time cost of repeated clinic appointments
However, they may not disappear completely without treatment
Signs and symptoms of vitamin B12 deficiency can include fatigue, pale skin, headaches, shortness of breath, fast heartbeat, gastrointestinal issues, mouth inflammation, paresthesias (abnormal sensations), decreased cognitive ability, depression, muscle weakness, imbalance and incoordination, vision problems, and erectile dysfunction
Forceval Capsules - Summary of Product Characteristics (SmPC)