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
I would and have recommended you to my friends
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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
NAD+ could be useful if your tiredness comes from low cellular energy rather than a lack of vitamins
We suggest doing blood tests and B12 level checks often