Dr. Weil's high-quality source of omega-3 nutrition. dietary supplement Q: Do I really need to supplement with an omega-3 complex? A: 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).