b12 injection in hip is it painful How to self-inject intramuscular vitamin - Overview Understanding Vitamin B12 Injections for
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However, it is important to note that B12 injections should only be given under the supervision of a healthcare professional
(source) Heffernan MA, Thorburn AW, Fam B, Summers R, Conway-Campbell B, Waters MJ, Ng FM

Not everyone needs to reach the highest doses

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