how low does b12 have to be for injections Shots at Home: How, Where & Often Inject Yourself Everything You Need to Know

Conditions like pernicious anaemia (an autoimmune condition affecting a protein called intrinsic factor vital for B12 absorption), stomach issues (such as from reduced stomach acid or certain medications like proton pump inhibitors), intestinal disorders (like Crohns disease or coeliac disease), or even surgical removal of parts of the small intestine (e.g., gastric bypass surgery) can prevent proper absorption

I will likely be using this product for the rest of my life

You can eat adequate B12 and still be deficient if you cant absorb it [2]

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However, the group receiving both AOD9604 and HA showed the most favorable results, suggesting a potential synergistic interaction