Crybaby: The Vitamins in Your Tears (image) Michigan Technological University Share Print E-Mail Caption Testing for nutritional deficiencies in blood can be invasive and expensive. A team led by Michigan Technological University explored what it takes to switch to tears instead. Credit Sarah Bird, Michigan Tech Usage Restrictions please credit Share Print E-Mail Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.