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is it legal to inject vitamin b12 yourself united states Best Injection Site: Administering B12 Shots Do You Need a Prescription
Description
self-administration by the patient does not qualify

If a provider quotes you a flat price without discussing units, you have no way to evaluate what youre actually getting
Watch for any specks, fibers, crystals, or clumps floating in the solution or settled at the bottom

NICE and BNF Guidance: You correctly point out that even official guidance from NICE and the BNF acknowledges that some individuals may require more frequent injections
