side effects of taking b12 injections Vitamin B12: Overdose and Are There Any Side Effects
Description
It may be difficult to determine the exact time when your vitamin B12 injections have started working, as many people will report noticing a difference in their energy levels within a few days following the shot, and others may not feel the increase in energy for multiple weeks if their body needs the vitamin to build up a bit more

Used for agents such as leuprolide, goserelin, or other hormonal antineoplastics

Anemia Irritability Depression Lack of energy Pale skin Shortness of breath Tingling sensations in hands or feet Balance problems Whats super important to also note is that if you have issues with high caffeine use or poor sleep, you cant fix that with B12
What is the role of tiaminal B12 injection in vitamin B12 supplementation
During initial treatment of severe deficiency, hypokalaemia (low potassium) can develop

Blocking NNMT raises cellular NAD+, which in research supports fat-cell metabolism and fat loss