Abstract: A method of treating cancer concurrent with receiving chemotherapy treatments which may effectively ameliorate the anemic and toxic effects induced by chemotherapy includes prescribing at least three hyperbaric oxygen therapy treatments per week at a pressure of at least 1.5 ATA, the treatments lasting at least 30 minutes each, prescribing a diet including less than about 300 grams of carbohydrates a day, and prescribing nutritional supplements in accordance with a nutritional supplement regimen including elevated amounts of vitamin B-12, vitamin E, and zinc as compared to a reference daily intake.