can i use bac water after 30 days Hospira brand 30ml Bacteriostatic Sterile for Injection How long bac water :

Vitamin B12 injections are medically necessary when a patient has severe deficiency, neurological symptoms requiring rapid correction, or a condition that prevents adequate oral absorption

Kidney protection1.0mg/wk The FLOW dose

Bifidobacterium can also effectively prevent the translocation of bacterial derivatives, such as lipopolysaccharide, to the liver via the portal vein, thereby alleviating hepatic inflammatory responses and endoplasmic reticulum stress [39]

My question, should I switch to the Nasal Spray from injections

As with any injection, there may be slight bruising, redness, and soreness at the injection site.

Wang XC, Xu Y, Jiang W, Luo FX, Zhang D, Wu D, Du YN, Hu JN