sublingual vs injections b12 Efficacy of different routes of vitamin supplementation for the treatment of patients with vitamin B12 deficiency: A systematic review and network meta-analysis Vitamin B12 Injections vs. Oral

Signs of allergic reaction Allergic reactions to peptides are uncommon but possible

[1] [6] Severe deficiencies may include symptoms of reduced heart function, suppression of bone marrow, as well as more various severe neurological symptoms possibly including sensory loss, abnormal balance and reflexes, memory and consciousness impairment, smell and taste problems, depression, irritability, confusion, and psychosis

Liver extract-folic acid-cyanocobalamin vs placebo for chronic fatigue syndrome

Cognitive impairment A meta-analysis reported that cognitive impairment prevalence happened to be less significant in people with diabetes treated with metformin

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