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When you inject into the arm (deltoid) your main goal will be to penetrate the muscle and then slowly deliver the vitamin B12 into the muscle, and then extract the needle at the same 90 degree angle that you inserted it
Gut surgery, pancreatic insufficiency, small intestinal bacterial overgrowth (SIBO), parasite infections, and certain autoimmune disorders are considered additional risk factors
This range is comfortable for subcutaneous injection, and the volume is large enough that small measurement errors don't create significant dose variability
Quality premium: Higher-quality vendors typically charge more but provide better assurance
Vitamin B12 level National Institute of Diabetes and Digestive and Kidney Diseases
Some patients might need supplements
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