negative side effects of b12 injections Vitamin for Aging and Longevity Vitamin B12 | The BMJ
Description
That said, side effects can occur: Common side effects (mild and transient) Injection site reactions: Redness, mild swelling, or tenderness at injection sites

Jun 24 2020;40(26):4981-4996
Individuals who are prone to fainting or otherwise feeling discomfort around a needle should seek help from a medical professional to administer the vitamin B12 dosages safely

In young children, symptoms include poor growth, poor development, and difficulties with movement
