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It showed that both effectively improve serum vitamin B12 levels for people suffering from vitamin B12 deficiency
However, long-term safety data is limited, and its full risk profile is not yet completely understood
Vitamin B12 Through the Oral Mucosa Vitamin B12 can also be absorbed through the oral and nasal mucosa, which is why it is also available in the form of lozenges, drops/sprays and (very rarely) as nasal spray
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