b12 injection in deltoid Where to administer shots, arm or thigh? b12 injection in thigh Where

Research shows that taking B12 in a sublingual oral form is more effective for treating B12 deficiencies than actually getting B12 intramuscular shots (and it's usually much more convenient and affordable as well)

Going beyond 500mcg rarely provides additional benefit and may increase the likelihood of mild side effects like headaches or injection site reactions

Prevalence and Risk Factors for Functional Vitamin B12 Deficiency in Patients with Crohns Disease Revisiting Vitamin B12 Deficiency: A Clinicians Guide For the 21st Century

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Lung Cancer In 2017, a study found that men taking B12 supplements appeared to have an increase in lung cancer risk

It depends on formulation and protocol