animal b12 injection for humans Buy NV Vitamin 100ml Cyanocobalamin Injection, 1000 mcg/mL 1mL

Butaphosphan is quickly absorbed at the injection site and it is distributed quickly after intramuscular or subcutaneous administration

These are often engineered for a much longer half-life, lasting days or even a week

Age, gastrointestinal disorders, and certain medications can also interfere with B12 absorption

Researchers should approach dosing with appropriate caution and ideally work with knowledgeable healthcare providers

But only a maximum of 5mcg of B12 enters the bile every day (according to "Advanced Haematology" 7th edition textbook, page 60), so it seems that only an additional 5mcg would be lost daily if none was recovered