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Directions for use By intramuscular, subcutaneous or intravenous injection Dogs and Cats: 0.5 - 1mL Sheep, Horses and Cattle: 1 - 4mL Repeat after 1-2 weeks
In gastric cancer after gastrectomy (which removes the gastric parietal cells and, thus, the source of intrinsic factor needed for normal vitamin B12 absorption), supplementation with vitamin B12 can prevent the development of vitamin deficiency (17)
Ultimately, this will vary from product to product
As B12 serum is going to be tested it may be interesting as the last time that was tested I was over 2000 whatevers so if it is any less it would add to the evidence that the vials were deteriorating over time
Your needs might be different, so its best to ask your doctor whats right for you
