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The conversion from cyanocobalamin to active forms requires several enzymatic steps and adequate amounts of other nutrients including folate, riboflavin, and various minerals
"And you'll get a cycle of yo-yo dieting that you no longer know how to stop because you messed up your own biochemistry
Mammalian cells are unable to produce cysteine de novo and the trans-sulfuration pathway which is required for the synthesis of cysteine from methionine is only present in the liver and a few other tissues 5
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