If you’re one of the millions of Americans who take dietary supplements, fish oil is most likely to be among the supplements you consume. According to new consumer research conducted by Consumerlab.com, more people in the United States now take fish oil supplements than even multivitamins, a longtime supplement staple for many Americans.

In Consumerlab’s survey of 6,000 U.S. consumers who take dietary supplements, fish oil came out on top as the most popular supplement, followed by multivitamins, vitamin D, calcium and CoQ10. The survey was based on a sampling of subscribers to Consumerlab’s free newsletter—most of whom are likely to be dedicated supplement users. In fact, the majority of people who participated in the survey reported using multiple supplements.

From a sales dollar perspective, multivitamins continued to dominate the dietary supplement market, generating $4.8 billion in 2009, according to Nutrition Business Journal estimates. Fish oil products, on the other hand, generated $980 million in sales in 2009, NBJ reports. Fish oil supplements are growing at a much faster rate, however, expanding 17 percent in 2009, compared to just over 2 percent for multivitamins.