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==What is Vitamin B9 (Folic Acid)?==

==What is Vitamin B9 (Folic Acid)?==

Vitamin B₉, also called folic acid, is an '''essential water-soluble vitamin'''. Dietary folic acid is hydrolysed by intestinal brush border enzymes and absorbed into the enterocyte by both carrier-mediated transport and passive [[Diffusion - Physiology|diffusion]]. Folic acid is further metabolised within the enterocyte to 5-methyl-tetrahydrofolate and released into the portal circulation. Circulating 5-methyl-tetrahydrofolate is then taken up by the [[Liver - Anatomy & Physiology|liver]] where it is either retained or released back into circulation. Folic acid derivatives are filtered by the [[Nephron Microscopic Anatomy#Proximal Tubule|renal tubules]], with active reabsorption during periods of low intake.

Vitamin B₉, also called folic acid or folate, is an '''[[Nutrition Glossary#Essential Nutrients|essential]] water-soluble vitamin'''. Dietary folic acid is hydrolysed by intestinal brush border enzymes and absorbed into the enterocyte by both carrier-mediated transport and passive [[Diffusion - Physiology|diffusion]]. Folic acid is further metabolised within the enterocyte to 5-methyl-tetrahydrofolate and released into the portal circulation. Circulating 5-methyl-tetrahydrofolate is then taken up by the [[Liver - Anatomy & Physiology|liver]] where it is either retained or released back into circulation. Folic acid derivatives are filtered by the [[Nephron Microscopic Anatomy#Proximal Tubule|renal tubules]], with active reabsorption during periods of low intake.

==Why is it Important?==

==Why is it Important?==