is b12 injection a vaccine What Are Injections? And Are They Safe? B12 Shots For Weight Loss:
Description
Severe or persistent symptoms may require medical attention and should be reported to your healthcare provider. Patients with certain health conditions or on specific medications should always talk with their healthcare provider before starting B12 injections to avoid interactions and ensure the treatment is appropriate
These lumps usually disappear on their own within a few weeks without causing any discomfort

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Unfortunately it seems they are poorly or incorrectly kept
