No new metabolites were found in urine, bile, and fecal samples other than the six components found in the plasma
Also, people who have had surgery on their intestines, like weight loss surgery, or have diseases that affect the gut, like Crohns disease or celiac disease, are also at risk of not getting enough vitamin B12 Anyone considering self-administering their own injections should confirm this is appropriate for their situation with their provider first, since not every patient or every formulation is suited to at-home dosing Last updated: April 1, 2026 If you have been feeling unusually tired this spring or wondering whether a vitamin B12 injection might be the answer, you are not alone PMID: 30098070 51 Each vial contains sterile water and is preserved with 0.9% benzyl alcohol to prevent bacterial growth, allowing for safe, repeated needle entry
Because vitamin B12 is water-soluble, any excess is safely excreted through urine, making ongoing treatment safe under proper supervision
Each unit on the syringe equals 0.01 mL