b12 injection side effects tiredness Feeling Tired All the Time? It Might Be a Vitamin Deficiency Chronic Fatigue: Can B12 Shots
Description
The injection itself is usually a quick, minor pinch

What is more, the vitamin B12 forms we have discussed above do not work alone in the body, but are part of a large complex of B vitamins and operate in combination with a number of other vitamins and minerals
IM administration should be done with an appropriate needle to reach muscle tissue, and the site should be rotated (for example, alternate buttocks) if injections are repeated regularly to avoid soreness

This maintains effectiveness while minimizing risks
