L-methylfolate (also known as L-5-MTHF, L-methylfolate, or 5-methyltetrahydrofolate) is the primary biologically active form of folate, a B vitamin that functions at the cellular level.[1] Unlike synthetic folic acid, which requires enzymatic conversion to become active, L-methylfolate is already in its active form and is the same form your body naturally uses and circulates through the bloodstream.[1] It is available commercially under brand names such as Deplin and is typically dosed at 7.5 mg to 15 mg tablets for most applications.[3]
L-methylfolate serves several critical biological functions in the body:
Primary Mechanisms: L-methylfolate is essential for DNA reproduction, the cysteine cycle, and the regulation of homocysteine.[1] Within cells, it is used in the methylation of homocysteine to form methionine and tetrahydrofolate (THF), which then accepts one-carbon units for the synthesis of thymidine-DNA, purines (RNA and DNA), and methionine.[1]
Mental Health Support: Systematic reviews suggest that adjunctive L-methylfolate modestly improves symptoms in major depressive disorder.[1] The compound can help regulate serotonin and dopamine levels, which are critical neurotransmitters affecting mood.[5] Early studies show L-methylfolate supplementation may be beneficial in treating severe depression and other conditions.[13]
Reproductive and Fertility Health: L-methylfolate is important for women's health and may support sperm development and reduce genetic issues associated with reproductive concerns.[11]
Other Applications: L-methylfolate is used to treat megaloblastic anemia and is particularly beneficial for patients with renal and hepatic impairment.[3]
L-methylfolate addresses several key health challenges:
The primary market segments for L-methylfolate include:
Healthcare Professionals and Their Patients