There's no bigger name in health care than Johnson & Johnson (NYSE:JNJ). This massive diversified health-care company has its hands in seemingly every niche of the health sector, yet it's stock has still posted strong gains over the past year. However, not all of Johnson & Johnson's many businesses are succeeding at the same rate: As the company's recent sale of its diagnostics business shows, Johnson & Johnson's clearly looking at focusing on which businesses are performing the best.

Broadly, the company's pharmaceutical branch has exploded over the past year. Johnson & Johnson's drug sales have surpassed the company's medical=device revenue to take the lead as the largest unit of the firm by revenue.

So just which three businesses are leading the revenue rise at this standout company? Find out the keys to J&J's growth in the following video, as Motley Fool contributor Dan Carroll takes you through the best-performing units of this company in 2013 -- and whether they can keep thriving in the new year.

Is your portfolio prepared for Obamacare?
Johnson & Johnson and other top names in the health-care business are facing down a huge new change in the medical landscape this year: Obamacare. The new law seems complex, but it doesn't have to be. In only minutes, you can learn the critical facts you need to know in a special free report called "Everything You Need to Know About Obamacare." This free guide contains the key information and money-making advice that every American must know. Please click here to access your free copy.

Dan Carroll has no position in any stocks mentioned. The Motley Fool recommends and owns shares of Johnson & Johnson. Try any of our Foolish newsletter services free for 30 days. We Fools don't 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.