Normally when you put out a product, you want to take sales away from the competition, not from other products that you sell yourself. But that's exactly what Gilead Sciences (NASDAQ:GILD) is doing, and Motley Fool health care analyst David Williamson thinks it's a great move.  Watch the video to find out why.

David Williamson owns shares of Johnson & Johnson. Max Macaluso has no positions in the stocks mentioned above. The Motley Fool owns shares of Gilead Sciences and Johnson & Johnson. Motley Fool newsletter services recommend Gilead Sciences and Johnson & Johnson. Try any of our Foolish newsletter services free for 30 days. We Fools may not all hold the same opinions, but we all believe that considering a diverse range of insights makes us better investors. The Motley Fool has a disclosure policy.