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Do I still need a vitamin B12 injection if I have not been diagnosed with deficiency
Overall, cigarette smoking will possibly decrease vitamin B12 concentration in serum by increasing its excretion in urine [44]

National Library of Medicine, PubMed: Clinical studies on GHK-Cu Cosmetic Dermatology Journal, 2022 Edition

"Oral vitamin B12 versus intramuscular vitamin B12 for vitamin B12 deficiency"

Can this calculator be used with different vial sizes
