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do b12 injections work quickly What Is Injection What's all the Buzz About Vitamin B12 Shots? B12 Injections for Weight Loss
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2019 Sep 15;15(9):1365-1367

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When you take a vitamin injection, on the other hand, the vitamin goes directly into your bloodstream, solving the absorption issue
Site rotation (alternating between abdomen, thigh, and upper arm regions) reduces the frequency of reactions

Patients who have undergone bariatric surgery or ileal resection are at particularly high risk
Certain MTHFR mutations, such as MTHFR C667T or MTHFR A129C, contribute to many health and fertility problems
