Very high intakes of folate bypass the need for the reaction that requires vitamin B12.What is this reaction?

Question

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The reaction that requires vitamin B12 is the conversion of methyl folate to folate. Vitamin B12 is necessary for the conversion of 5-methyltetrahydrofolate (methyl folate) to tetrahydrofolate (THF), allowing for the continuation of the folate cycle and the synthesis of DNA. High intakes of folate can mask vitamin B12 deficiency by bypassing this need, potentially leading to neurological damage if the deficiency is not corrected.

Very High Intakes of Folate Bypass the Need for the Reaction