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The copper complex is the constrained one
[4] Functions [edit] This vitamer, along with adenosylcobalamin, is one of two active coenzymes used by vitamin B 12 -dependent enzymes and is the specific vitamin B 12 form used by 5-methyltetrahydrofolate-homocysteine methyltransferase (MTR), also known as methionine synthase
Your physician reviews your baseline labs before recommending any protocol
They may also be necessary when certain medications interfere with B12 absorption or in any other diagnosed condition specifically impacting B12 uptake
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