b12 injection made from Sandoz Vitamin Injectable Solution - 1000 mcg/10 mL Cyanocobalamin (B12) / Products /
Description
Another person with no role in the next steps of the trial and unaware of random sequences assigned patients to the numbered bottles of tablets

The duration of the effects of a B12 injection can vary
This may occur if antimetabolites for the vitamin are employed in the treatment of neoplasia

Deficiency may occur from conditions like pernicious anemia, gastrointestinal disorders, or surgeries that affect nutrient absorption
