bac water same as sterile water Bacteriostatic vs Key Differences — Mountainside Medical BAC WATER | Bacteriostatic Water
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doi: 10.1016/S0140-6736(98)01085-X

This could be because they huffed a lot at the time, or they might have other health conditions (like anemia) or a pre-existing vitamin B12 deficiency

After exhaustion of the liver reserves, pernicious anemia, symptomatic psychoses and funicular spinal diseases occur, which initially manifest themselves in paresthesia with a tingling sensation and weakened muscle tone, accompanied by depressive moods

However, further research is needed to determine the intermediate level of its concentration [23]
Erythropoietins (EPO) and agents affecting erythropoiesis, including, but not limited to: 1.1 Erythropoietin-receptor agonists, e.g

Some cancer treatments can harm the gut, making it hard to absorb B12