Do I really need to supplement with an omega-3 complex? We all need these healthy fats, which are found primarily in oily fish that live in deep cold water. Research indicates that they promote cardiovascular health while also supporting brain function. Weil Omega-3 Complex is derived from molecularly distilled fish oil that is independently tested for heavy metals (mercury and lead) and other contaminates (including PCBs). Andrew Weil, M.D., donates all his after-tax profits from the sale of Weil Nutritional Supplements to the Weil Foundation, an organization dedicated to sustaining the vision of integrative medicine.