The ideal B12 supplement contains a mix of methylcobalamin, hydroxocobalamin and adenosylcobalamin (11)
Protein Expression Analysis: Evaluating transcriptional and translational responses in controlled laboratory systems
INDICATIONS AND USAGE Cyanocobalamin is indicated for vitamin B 12 deficiencies due to malabsorption, which may be associated with the following conditions: Addisonian (pernicious) anemia Gastrointestinal pathology, dysfunction, or surgery, including gluten enteropathy or sprue, small bowel bacteria overgrowth, total or partial gastrectomy Fish tapeworm infestation Malignancy of pancreas or bowel Folic acid deficiency Cyanocobalamin Injection, USP is also suitable for the vitamin B 12 absorption test (Schilling test)
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Your body can only store a small amount of B12 in the liver
The only time I have heard of this insomnia and vivid dreams is somebody not too long ago mentioned taking another B vitamin twice a day which caused them insomnia and vivid dreams, I not entirely sure but it might have been B6