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No human bioavailability data exist for oral, sublingual, or transdermal routes, so claims that one route works better in people are unsupported
People with pernicious anemia often take 1000 to 2000 mcg of oral vitamin B12 daily
Subsequent development toward clinical use has been minimal, and the compound has not entered FDA-approved status for any indication
250 (500 )
That makes buying it legally murky
In cases where the diagnosis is still unclear after initial testing, other lab tests, such as MMA and homocysteine levels, are available
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