make your own bac water Bacteriostatic Bac Water: What It Is,

We frequently mention research chemicals that are not made for human consumption

Conditions like pernicious anaemia (an autoimmune condition affecting a protein called intrinsic factor vital for B12 absorption), stomach issues (such as from reduced stomach acid or certain medications like proton pump inhibitors), intestinal disorders (like Crohns disease or coeliac disease), or even surgical removal of parts of the small intestine (e.g., gastric bypass surgery) can prevent proper absorption

No, taking Vitamin B12 supplements during chemotherapy can be risky

Watson PE, Watson ID, Batt RD

For this reason, healthy adults should not get more than 1,000 mcg of folic acid a day