Are fish oil tablets really a magic pill?

It's known as the miracle compound: Omega-3s are an amazing fat that can helps lower blood pressure, help with heart disease, and can strengthen brain function.

We consume omega-3s in fish and increasingly in supplements made from marine creatures. But there may be more to the story of those magic fish oil pills. Are they as environmentally sustainable or as healthy as we thought?

Ross Reynolds speaks with author Paul Greenberg about his new book "The Omega Principle: Seafood and the Quest for a Long Life and a Healthier Planet." Greenberg warns that the way in which fish oil supplements are made is not sustainable.