We can't stress this enough: for replicable, scientific results, you need this control
The debilitating fatigue which seems to be the most common symtpom of B12 deficiency may be due to a combination of neurological factors, anaemia, and the role of B12 in the mitochondria
Rita Cardoso B, Silva Bandeira V, Jacob-Filho W, Franciscato Cozzolino SM
Stuart (USA authors) Very comprehensive with lots of case studies
In a head-to-head trial against a full-strength GLP-1 drug, tirzepatide reduced food craving without changing measured restraint. Slower stomach emptying also makes smaller portions feel filling for longer. People whose eating was driven by stress, reward, or constant mental effort often describe the quiet as relief
Common signs include reduced sexual desire, fatigue, decreased muscle mass, increased body fat, and mood disturbances such as depression or irritability