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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
Otherwise, absorption of vitamin b12 interfered
Thus, there is little data from which to draw conclusions about its safety, especially regarding long-term use in humans [2]
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This form is highly stable and can be stored for several years
If you have a history of cancer, autoimmune disease, or are pregnant or breastfeeding, most doctors say to stay away
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