The body need vitamin B12 and B6 for the health of the blood and the nervous system, respectively. Vitamin B6 also protects the heart against strokes. Squid contains vitamin E and selenium. Selenium, which is only found in trace amounts in the body, collaborates with vitamin E to support healthy body growth and fertility. A 4-ounce portion of squid contains 507 milligrams of dietary cholesterol, or 169 percent of the daily recommended amount. According to the University of California, you should try to consume fewer than 300 milligrams of cholesterol per day if you are not thought to be at high risk for heart disease.