This post was originally published on October 5, 2017, and updated on January 15, 2025
Spoiler: It wasn't the testoster
First, confirm you are using the right vial
Patients should avoid ingesting large amounts of vitamin C within 1 hour of oral vitamin B12 administration Extended release potassium products Antibiotics such as gentamicin, neomycin, tobramycin Anti-seizure medications such as phenobarbital, phenytoin, primidone Medicines used to treat heartburn like H2 blockers such as cimetidine and proton pump inhibitors such as omeprazole Antacids such as ranitidine, cimetidine Vitamin B12 Injection Storage and Safety Information Vitamin B12 tablets should be in a cool and dry place
Baseline B12 and folate assessment may help provide context for why some patients experience suboptimal outcomes with GLP-1 therapy, even when medications are dosed correctly
Treatment based on symptoms instead of blood values The recommended treatment in the Netherlands consists of a hydroxocobalamin injection of 1mg every two months, after an initial loading dose of 10 injections in 5 to 10 weeks