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A review found that for people without advanced neurological disorders, vitamin B12 supplements are unlikely to improve brain function

Using measurement of radioactivity excreted in the urine, a test result indicating uptake of B12 was considered conclusive, whereas a test result suggesting no uptake should be judged with caution

Importantly, obesity can also worsen pre-existing T2 high asthma, highlighting that its impact is not limited to the obesity-driven asthma endotype but extends across asthma phenotypes [38]

Research suggests that Vitamin B12 may influence appetite by affecting the production of neurotransmitters in the brain, including serotonin