The appearance of a pustular/papular rash associated with high levels of Vitamin B12 is well described in the medical literature even though the exact mechanism appears to be unknown
No evidence suggests that optimizing b12 status accelerates weight loss beyond what would occur with adequate nutrition overall
(PubMed) Shrubsole MJ, Shu XO, Li HL, et al
The rejection was efficacy-based, not safety-based adverse events were limited to mild injection-site reactions
Because Vitamin B12 plays a key role in mood, nerve cells, heart health, cognitive function, vision, and nutrient absorption, it is an excellent tool to prevent fatigue and enhance endurance
If you are B12 deficient you may have trouble regulating your emotions, and may also experience disrupted sleep patterns