They can assess your individual risk profile, review your current medications for potential interactions, and refer you to specialist services where appropriate
What kinds of applications do they have
A lot of the things we associate with feeling ill - even fever - can be the immune system fighting infection so it may be that the B12 puts your immune system into overdrive for a short while but then calms down after 24 hours
In addition to an oral vitamin, you can also get vitamin B12 shots
For others, it might take a few weeks of consistent injections before you notice a change if your symptoms are more complicated, such as numbness, exhaustion, or memory problems
If youre looking to improve athletic performance or accelerate recovery, its far safer (and more effective) to rely on verified, researched methods