The most performance-relevant outcome is improved oxygen delivery, because B12 deficiency directly causes anemia and reduced VO2 max regardless of training
Taking Mounjaro may not directly lower your alcohol tolerance, but losing weight could
Glutamine performs various biological functions, such as substrate for the synthesis of nucleotides, antioxidants and other biosynthetic pathways that are involved in the preservation of integrity and cellular function, energy production, gluconeogenesis, ammonia clogger or the maintenance of acid-base balance
If you're subject to WADA or USADA protocols, plan your cessation window accordingly
Ishibashi et al
J Biol Chem 285(1):723730 Vilsbll T, Holst JJ (2004) Incretins, insulin secretion and type 2 diabetes mellitus