Ultra Omega-3 from NOW contains a natural fish oil concentrate thats manufactured to strict quality control standards and is free of harmful levels of contaminants such as PCBs, dioxins, heavy metals, and more. These enteric-coated, odor-controlled softgels are ideal for individuals who typically experience nausea or reflux with fish oil products. Ultra Omega-3 is also molecularly-distilled and cholesterol-free.