Its easy, and you can learn how to do it in 10 minutes
The best way is through a nutrient-dense diet
If your condition allows, try to eat regular meals with protein and complex carbohydrates to support your metabolism
If you've been taking oral B12 supplements without feeling a difference, a shot is the most reliable way to find out whether the issue is your B12 levels or something else
Liu H, Liu D, Zhao X, Wright M, Guo H, Deng Y, Guo H
According to USDA Agricultural Research Service data based on NHANES, approximately 6% of adults aged 60 and older in the United States are vitamin B12 deficient, defined as plasma B12 below 148 pmol/L (2009)