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The enzyme that transfers a methyl group from S-adenosylmethionine (SAM) to nicotinamide, producing 1-methylnicotinamide
Patients who have early Leber's disease (hereditary optic nerve atrophy) have been found to suffer severe and swift optic atrophy when treated with vitamin B12
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For vitamin B deficiency (e.g., pernicious anemia), a common regimen is to begin with frequent intramuscular injections to replenish body stores
Athletes and fitness enthusiasts appreciate this benefit, as it allows for fat loss while maintaining or even improving strength and performance
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