how much b12 can you have in an im injection Vitamin Sites: All Need to Know Cyanocobalamin Injection USP 1000 mcg/mL
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Going good so far

Loss of memory, mood swings or brain fog: your brain will be less oxygenated and full of nutrients (Harvard Health, 2022)

investigated the effects of an oral B vitamin regimen inclusive of B12 in prevention of the development of CIPN in a population of patients with neoplastic disease commencing chemotherapy

Your body can also store some B-12 for later use

[4] Dimet-Wiley A, et al
Patch is not waterproof