why do people take b12 injections The Shot: What Every Human Needs to Know About Injectable Vitamin B12 Why Do You Need B12

However, high doses of vitamin B12, such as those used to treat a deficiency, might cause: Headache Nausea and vomiting Diarrhea Fatigue or weakness Its important to note that these side effects are generally mild and temporary

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If you have a history of severe allergies, discuss alternatives or precautions with your clinician

Some solutions include additional beneficial ingredients while others contain fillers or unnecessary additives

Holotranscobalamin (holoTC, or active b12) Another useful test is the holoTC test (or active-B12 test), which measures the portion of B12 bound to transcobalamin