Vitamin B9, commonly known as folate in its natural form, is a water-soluble B vitamin essential for DNA synthesis, cell division, and proper red blood cell formation. Research suggests that adequate folate intake plays a critical role during pregnancy, where it has been strongly associated with reduced risk of neural tube defects in developing babies. Studies also indicate that folate may support mood regulation by contributing to the production of neurotransmitters such as serotonin, and emerging research has explored its potential role in eye health and cardiovascular function. Available in supplemental forms including folic acid, L-methylfolate (5-MTHF), and folinic acid, the latter options have drawn interest particularly for individuals with genetic variations affecting folate metabolism, though individual needs and responses can vary considerably.
Compare this supplementResearch suggests that folate (vitamin B9) plays a well-established and mechanistically understood role in the preven...
View studies →Research suggests a meaningful link between folate status and mood, with people experiencing depression frequently sh...
View studies →Research suggests that folate, along with other key nutrients, may play a role in supporting eye health, particularly...
View studies →Research suggests that folate plays a role in several biological systems relevant to pregnancy and early development,...
View studies →These are commonly referenced dosage ranges for this supplement. They are not medical recommendations. Always consult a healthcare provider before supplementing.
| Form | Dose range | Frequency | Studied for | Source |
|---|---|---|---|---|
| Tablet | 1,000–5,000 mcg | Daily | Anemia — treatment of folate-deficiency megaloblastic anemia | Common in clinical trials for folate-deficiency anemia; 1000–5000 mcg used therapeutically under medical supervision |
| Tablet | 2,500–5,000 mcg | Daily | Eye health — reduction of homocysteine linked to age-related macular degeneration risk | Based on the Women's Antioxidant and Folic Acid Cardiovascular Study and related RCTs |
| Tablet | 400 mcg | Daily | General health — standard dietary supplementation to meet recommended daily intake | Reflects the established RDA for adults; common in multivitamin and standalone supplement formulations |
| Tablet | 400–800 mcg | Daily | Mood support — reduction of homocysteine and adjunct support in depression | Based on RCTs examining folate and methylfolate supplementation in depressive disorders |
| Tablet | 400–800 mcg | Daily | Pregnancy support — neural tube defect prevention in women of childbearing age | Widely supported by RCTs and public health guidelines; 400 mcg is the standard RDA for pregnancy prevention, 800 mcg used in higher-risk populations |