People with Digestive Issues : Individuals with Crohns disease, celiac sprue or individuals who have suffered mucosal injury through surgery or gastric banding surgery are unable to absorb vitamin B12
Timing varies by individual and program structure
Beginners typically start at 300mcg to assess tolerance and response
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Why Anti-Vax Doctors Are Ordering 23andMe Tests. The Atlantic, 23 May 2019,
Healthcare providers should document all supplements and compounded preparations patients are using (including full ingredient lists and lot numbers), counsel on proper injection technique and site rotation, and monitor for unexpected adverse effects