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10.1210/jcem.87.1.8146 J
CDC Vaccine Administration Subcutaneous injection technique: angle, site selection, and no aspiration guidance
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Perform a patch test before first use on clients with known sensitivities
If you are B12-deficient, your doctor will determine how much of the vitamin you need to take
Patients curious about it should hear from a physician about what is actually known and what is not
