16 B12 has a half-life of approximately six days in the blood, which usually means that it takes around six days before half of the injected amount is eliminated from the body
At Rockefeller, Mojsov's supervisor was Bruce Merrifield, an American biochemist who, just after she left his laboratory, won the Nobel Prize in 1984 for developing a simple method to synthesise peptides
doi: 10.3389/fendo.2021.626390 118 ZhaoLZouYZhangJZhangRRenHLiLet al
It is possible to start semaglutide with adequate levels of vitamin B12 and gradually develop a deficiency while using semaglutide, so you should work with your doctor to stay on top of your B12 levels
Your provider adjusts the stack based on injury severity, your response, and lab findings at intake
But that long half-life also means accumulation takes time, and dose escalation extends the timeline further