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Nature 401 , 297300 (1999)
Oral Supplements Injections act faster and are more reliable in people with absorption issues, while oral supplements can be effective in mild deficiency
( b ) Beutler, E., and Duron, O., Transfusion , 5 , 17 (1965)
Discussion We make no claim to have identified definitive an immutable criteria for the use of vitamin B12 in general practice
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