l-carnitine effects Carnitine Deficiency: What Is It, Causes, Symptoms, and More Can L-Carnitine Cause Side Effects?

On one hand, iron overload drives ROS generation and lipid peroxidation

7 Well known examples of radical ROS include nitric oxide (NO), superoxide, and hydroxyl (OH) groups, whilst non-radical ROS encompasses molecules such as ozone, peroxide, hydroxide and peroxynitrite

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Nat Rev Gastroenterol Hepatol 16(2):79-80, 2019

If oral B12 replacement has been trialled in a person with metformin-associated B12 deficiency, I would suggest that a repeat measurement of B12 levels after 812 weeks is a good time to reassess whether absorption is adequate or whether a switch to intramuscular replacement is required