US Nutraceuticals, a manufacturer of supercritical fluid extracts for the dietary supplement, nutraceuticals and functional food industries, has acquired the astaxanthin business of La Haye Laboratories, a privately held company based in Redmond, Washington. La Haye, founded in 1986, is engaged in researching, manufacturing and marketing novel, high-potency antioxidants, including its patented astaZANTHIN and Zanthin ingredients. Both ingredients are potent and natural antioxidants utilised worldwide in many leading dietary supplements and skincare products, the company said.