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Side Effects of Excessive B12 Intake Whilst vitamin B12 toxicity is uncommon, several adverse effects have been reported in association with very high B12 levels, though establishing direct causation remains challenging

A healthcare professional can help determine the appropriate dosage for your specific requirements

We advise readers who purchase our B12 product to inject SQ, because IM shots can be painful and may discourage self-injection

They can improve symptoms such as numbness and tingling, weakness, difficulty walking and memory trouble, as well as reduce anemia and fatigue

In my experience, injections in the skeletal muscles (intramuscular injections) result in a more dramatic improvement in symptoms including energy and weight loss