does b12 injection have to be in muscle

Size:20mL https://incitefulmed.com/og/questions/do-oral-b12-pills-work-for-autoimmune-gastritis.png Vitamin B12 helps decrease homocysteine levels in the blood which lowers the risk of heart disease and stroke Pernicious anemia How to Give Yourself a B12 Injection | ThinWorks

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