L-5-MTHF Capsules by Seeking Health provide 1,000 mcg of pure non-racemic L-methylfolate, an active coenzyme form of folate. Folate is a water-soluble B vitamin that occurs naturally in food, such as leafy green vegetables, citrus fruits, dried beans, and peas. The methylated form, L-5-methylfolate (L-5-MTHF) requires no additional metabolic steps to be used by the body, and is often the preferred choice for those with absorption or metabolic defects.