Common research community cycles run 8 to 12 weeks on, followed by 4 to 6 weeks off
Because levels are often quite low before a deficiency is recognized, it can take some time for serum concentrations to even out and symptoms to subside
If youre looking for fewer calories, fat-free Greek yogurt is a healthier option that also provides a solid amount of vitamin B12 (it even has more vitamin B12 than whole-fat yogurt)
Many people feel a noticeable energy lift within hours of their B12 injection, with the maximum benefit usually appearing one to two days later
For vegetarians, fortified foods like breakfast cereals, plant-based milk, and nutritional yeast can provide B12
It is one of the two bioactive forms of B12 that the body can use directly without conversion