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is oral b12 as effective as injections vs Supplements: Which are more effective? B12 Shots: Vitamin B12 Injections
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Clinical trial data confirmed this directly

It's important to note that these injections typically last just under a week, which is why regular administration is crucial for maintaining consistent results

The frequency of B12 injections can vary based on individual needs, current B12 levels, and specific health goals
National Institutes of Health Vitamin B12 2