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High-dose oral B12 can even help overcome mild absorption problems, as some of the vitamin is absorbed passively
Vitamin B 12 deficiency can develop with heavy regular use of nitrous oxide N 2 O, also known as "laughing gas", used for anaesthesia in a clinical setting or as a propellant gas, commonly abused as a recreational drug
Mutations in ABCD4 cause a new inborn error of vitamin B12 metabolism
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