There are several causes of vitamin B12 deficiency, including poor dietary intake, malabsorption, and pernicious anemia
Diet: whether you are getting enough iron, which your body also needs to build red blood cells
The national drug laboratory will now have to answer the question the strips cannot: Is this actually fentanyl, a precursor setting off the tests, or a 5-Amino-1MQ causing one very alarming false positive after another?
Well, the number of times that one can get a vitamin B12 shot depends on various factors, including the degree of B12 deficiency, cause, and as per advice from your doctor
For subcutaneous injection, doses of 250-500 mcg per day are commonly used