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If the vitamin is administered by injection in response to a deficiency and enters the bloodstream directly in high concentrations, an immunologic reaction with skin reactions is possible
You should be aware of them beforehand so that you know when to contact your doctor
This is why most treatment protocols recommend receiving injections once or twice per week
Consistent weekly injections for at least 4-6 weeks allow adequate time to assess meaningful response
B12 injections are very well tolerated
Understanding Dosage Measurements in mcg and ml Vitamin B12 injections are measured in micrograms (mcg) or milliliters (ml)
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