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In fact, a 2008 study found that after taking a 1,000 mcg oral supplement, only approximately 1.3% (or 13 mcg) of B12 was absorbed into the bloodstream

Repeated IV use has been linked in some reports to thyroid disruption, kidney stress at high doses, and occasional skin reactions

Oral and Sublingual Forms For individuals without absorption issues, tablets and sublingual drops or sprays may suffice for maintenance

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