Lovaza is a brand name prescription drug. The capsule developed by GlaxoSmithKline contains esterified fish oils and is approved by theU.S. Food and Drug Administration to lower very high triglyceride levels. It is metabolized into Omega-3 fatty acids. It is a dietary supplement that has been purified, chemically altered, branded, and been put through the FDA's approval process; in these respects it is considered a pharmaceutical: unlike unregulated extracts, there is no risk of contamination by methyl mercury, arsenic, or other pollutants that are often seen in the world's oceans.