Are there any risks for people with certain medical conditions
The NHS notes that adults need only around 1.5 micrograms a day, which a normal mixed diet covers with ease
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When bowel changes occur during B12 supplementation, they are typically attributable to other factors such as concurrent medications, dietary changes, or the presence of iron or calcium in multivitamin formulations
In cases of documented vitamin deficiency, the regimen could be an initial intensive phase (like 2 mL IM three times a week for 2 weeks) followed by reevaluation
But since your injection bypasses the gut, that particular interaction is not an issue for the injection itself