system
Given the following post, respond as if you're commenting on Reddit:
human
Does a certain vitamin deficiency actually curb hunger, instead of increasing it?
gpt
Where did you get the information that B12 is an appetite suppressant?  It is in no way "common knowledge" because it is not true.  It's an essential vitamin for numerous processes, and it is highly unlikely you are deficient in it unless you eat a very poor diet.  (This is true for pretty much everything in a multivitamin...maybe the exception being Vitamin D/Calcium).

This is 99% all in your head.  If anything, the water you have with the pill is the culprit to get everything flowing again and making you want food.