The studies were done on rodents, the b12 isnt available in the kidneys for very long, weeks, not months it seems.and whether humans with b12 deficiency because of a broken system can access this b12 we wont know without further research
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[1] Particular concerns with multi-dose vials include dosing errors (confusion between mg, mL, or units) and contamination from repeated access
Side effect profiles in published research depend on dose, route, and model system
Ive been ordering since the early 2000s and Ive NEVER had a problem with the shots, customer service, delivery, unapproved charges