What’s Selling is our monthly review of what our retailers nationwide say is selling well in their stores. This month, we’ve compiled data from April to June to see what was popular in the second quarter of 2012.

New Brunswick, NJ—A team from Rutgers University believes two forms of vitamin E could be a huge help in the fight against colon, lung, breast and prostate cancers. The group zeroed in on the gamma and delta-tocopherols forms of vitamin E, derived from soybean, canola and corn oils. “There are studies suggesting that vitamin E actually increases the risk of cancer and decreases bone density,” says Chung S. Yang, director of the Center for Cancer Prevention Research at Rutgers Ernest Mario School of Pharmacy.

Bergen, Norway—A new study published in Metabolism: Clinical and Experimental indicates there may be a connection between obesity support and krill supplementation.

New York, NY—New research indicates there may be an effective way to enhance levels of l-glutamine in the blood. This amino acid plays a vital role in cell proliferation, provides the fuel for respiration, supports muscle recovery after exercise and enhances healthy immune function.

On April 24, the U.S. Food and Drug Administration (FDA) issued warning letters to 10 manufacturers and distributors of dietary supplements containing dimethylamylamine (DMAA). DMAA is commonly found in sports and weight-loss supplements.

Laguna Beach, CA—Richard A. Passwater, Ph.D., scientific editor/author of WholeFoods’ Vitamin Connection column and well-known nutrition researcher, and fish oil authority Jorn Dyerberg, M.D., DMSc., have co-authored a new book about omega-3s that is due out this summer.

Pittsburgh, PA—First-quarter sales for GNC Holdings Inc. better than expected. Revenues were $624.3 million, which was 23% higher than they were last year at this time.

Washington, D.C.—For the first time, annual consumer purchases of organic products in the United States have topped $30 billion. At $31.5 billion, $29.22 billion of which went to organic foods and beverages with organic non-foods at $2.2 billion, the sector grew 9.5% in 2011 over the previous year.

The concept of a commercial product with a net environmental impact of zero, at least in terms of its carbon footprint, is an enticing possibility for eco-conscious businesses and consumers. Now, products can officially obtain this “carbon-free” status, and step out in style with a certification and seal program, courtesy of a collaboration between NSF International and the Carbonfund.org Foundation.