There are no documented serious adverse effects from taking excess vitamin B12
In the first 2448 hours, some patients experience what is sometimes described as a 'boost' in energy levels or improved mental clarity
PMID: 28223907 [3] Yamada K
Chemcobal-2500 Methylcobalamin 2500 mcg Injection Manufacturer Medi Chemic Labs Chemcobal-2500 is another effective methylcobalamin injection brand in India that is used for treating nerve disorders and vitamin B12 deficiency
Sources: Institute of Medicine, Food and Nutrition Board, National Academies of Science, Dietary Reference Intakes (DRI): Recommended Dietary Allowances and Adequate Intakes , USA 2018, Mustafa Vakur Bor, Kristina M von Castel-Roberts, Gail PA Kauwell, Sally P Stabler, Robert H Allen, David R Maneval, Lynn B Bailey Ebba Nexo Daily intake of 4 to 7 g dietary vitamin B-12 is associated with steady concentrations of vitamin B-12related biomarkers in a healthy young population Am J Clin Nutr 2010 91: 3 571-577
