GNC Mega Men® 2X MORE D-3 Dietary Supplement Clinically Studied Multivitamin with 1,600 IU of vitamin D-3 for colon health and immune support B-vitamins for energy support. Selenium, lycopene and vitamin E to support prostate health. Fights cell aging with advanced antioxidant blend. Frank J. Costa M.D., an acclaimed urological surgeon and men"s health expert, is part of the GNC Medical Advisory Board. One of American"s Top Physicians, Dr.Costa lectures nationally and international.