يستعمل دواء تري بي 20 اقراصtri-b 20 tab. vitamin vitamin

about folic acid -dietary supplement folate derivative( b9 ) water soluble vitamin. -mechanism of action of folic acid -folic acid reduced by enzymes folate reductase and dihydrofolate reductase and forms dihydrofolic acid tetrahydrofolic acid respectively. tetrahydrofolic acid acts as a coenzyme which mediates a number of one carbon transfer reactions by carrying a methyl group as an adduct. it involves a number of reactions such as 1).conversion of homocysteine to methionine. 2).synthesis of thymidylate which is an essential constituent of dna from methylene-tetrahydrofolic acid. 3). conversion of serine to glycine by tetrahydrofolic acid and forms methylene-tetrahydrofolic acid. 4).to introduce carbon units at position 2 and 8 during de novo purine synthesis requires formyl-tetrahydrofolic acid and methenyl-tetrahydrofolic acid.5).generation and utilization of -formate pool-. 6).for mediating formino group transfer in histidine metabolism. folic acid is required to maintain normal