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We scoured the medical database for reports of allergic reactions to B12 shots, and this is all we could find
Adequate studies in humans have not been conducted
Your doctor will typically monitor your response and perhaps repeat blood tests for vitamin levels (or relevant markers like homocysteine levels, complete blood count, etc.) after a certain number of injections
For example, one study found that after taking 1,000 mcg of oral vitamin B12, only about 1.3% (13 mcg) is absorbed into the bloodstream
This way, you can make sure youre getting the most health benefits from B12 shots
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