?Specially designed to help maintain healthy homocysteine levels already within the normal range, our new Swanson Ultra Activated Homocysteine Formula features reduced, bioactive forms of key homocysteine-related nutrients including Quatrefolic folate and vitamin B-12 methylcobalamin. Quatrefolic is a new, scientifically advanced form of reduced folate that boasts long-lasting stability, high solubility and even better bioavailability than the leading brands.