Carpinteria, Calif.-based Hollandia Produce LP’s Live Gourmet brand Living Upland Cress and Grower Pete’s Organic brand Living Watercress were  certified in March by third-party audit firm Scientific Certification Services as antioxidant-rich superfoods.

The certification is based on a laboratory analysis of the products’ antioxidants levels, particularly lutein, an antioxidant known to fight cancer-causing free radical compounds.

Lutein, which is also found in leafy greens such as spinach and kale, also has been found to support eye health and vision, according to researchers at the American Optometric Association.