B complex vitamins are required for optimal health, particularly for healthy nervous system function and useful for supporting neurological system requirements as it is the only form of folate that crosses the blood-brain barrier.* B Complex Plus by Seeking Health is formulated with bioavailable, well-tolerated forms of B complex vitamins and cofactors inositol, PABA, and choline. B Complex plus contains no flow agents, preservatives, or common allergens such as yeast, gluten, dairy, or soy.