Deficiency in vitamin B12 may cause anemia, fatigue, muscle weakness, intestinal problems, nerve damage, and mood disturbances
Among elderly individuals, vitamin B 12 deficiency is more common, primarily because of impaired intestinal absorption that can result in marginal to severe vitamin B 12 deficiency in this population
Despite its wide range of uses, Methylcobalamin is generally well tolerated, with few side effects reported
Some breakfast cereals and nutritional yeasts are fortified with B12, providing a good source for vegetarians
No muscle loss was observed, indicating that weight reduction came specifically from fat tissue rather than lean body mass