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The evidence base discussed reflects the current peer-reviewed literature

Mild soreness at the injection site is possible

10.21037/atm-21-2829 81 LvL.HanQ.ChuY.ZhangM.SunL.WeiW.et al (2015)

Vitamin B12 plays an important role in red blood cell production, nerve function, energy metabolism, and cognitive wellness

Without treatment, this leads to megaloblastic anaemia and potentially serious neurological complications

They are generally safe for most people, but not recommended for individuals with a history of medullary thyroid cancer, MEN2, pancreatitis, severe kidney or liver disease, or those who are pregnant or breastfeeding. What are the most common side effects of GLP-1 drugs