人们常说“物极必反”，日常增补维生素和微量元素也同样如此，若干研究表明“如果长时间大剂量增补维生素+微量元素，实际上对人的健康不利。”（A lot of findings jibe with other studies that have linked taking large amounts of supplements with increased cancer risk, Such studies have tied large amounts of omega-3 fatty acids to endometrial cancer, excess folate to colon cancer and beta carotene supplementation to lung cancer, High doses of selenium have also been linked to skin cancer.