side effects of b12 injections in humans Vitamin Effects: Risks Excess Intake Common Mistakes in B12 Injections

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The anti-inflammatory mechanism activates early

Because safety data remains limited, patients should avoid extended cycles unless a qualified provider determines that continued use is appropriate.

People Taking Certain Medications Long-term use of metformin (a common diabetes medication) and proton pump inhibitors (PPIs) like omeprazole can reduce B12 absorption over time

Insulin sensitivity and glucose handling

A lack of vitamin B12 can lead to vitamin B12 deficiency anaemia which causes the body to produce abnormally large red blood cells that cannot function properly to carry oxygen around the body, leading to nerve damage or neuropathy