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The World Anti-Doping Agency (WADA) has declared it a prohibited substance as of 2022

Taking vitamin B12 injections completely bypasses any digestive absorption issues and consequently get the vitamins to where they are needed

It is involved in the formation of red blood cells, DNA synthesis, and proper nerve function

When the 60 mg vial makes financial sense You are at a maintenance dose of 7.5 mg or higher (you will use the vial within the stability window) You have already titrated using smaller vials and know your target dose You are comfortable with reconstitution and precise syringe measurements You can store the vial properly for the entire duration When smaller vials make more sense You are just starting tirzepatide and do not know your dose yet You are microdosing at very low amounts (1-2.5 mg) You want to test a new vendor or batch before committing to a large purchase Your storage conditions are not ideal (unreliable refrigeration, travel) Syringe selection and measurement precision The syringe you use matters more than most people realize