Thera-B provides a full-complement of essential B-complex vitamins and related nutrients in high-potency amounts. Inclusion of Metafolin* L-5-methyltetrahydrofolate (L-5-MTHF), a bioactive form of folate, ensures more immediate effects than folic acid on metabolism. As the only form of folate that crosses the blood-brain barrier, L-5-MTHF is especially useful for supporting neurological system requirements for this nutrient.* Activated vitamin B12 as methylcobalamin enhances B12 absorption and bioavailability. Extra amounts of biotin to augment its role for nervous system function and glucose metabolism are added to this yeast-free formula.*