Benefits are based on preliminary research and clinical use cases
When used in conjunction with diet and exercise, weekly weight loss of 1-2 pounds a week can be achieved and one can lose up to 15-20% of their body weight over 6-12 month period of time
The NHS symptoms list groups them into general anaemia symptoms (tiredness, breathlessness, headaches, loss of appetite, weight loss) and neurological signs (peripheral neuropathy, balance problems, depression, memory and concentration changes, sometimes mood changes or psychosis in advanced cases)
Most people get 1000 mcg (1 mg) of B12 once or twice a week
If you experience side effects like dizziness, it is advisable to limit alcohol intake