Vitamin K effects (IMAGE) Experimental Biology Caption A diagram illustrating the mechanisms by which vitamin K (MK-7) is thought to produce a neuroprotective effect in the aged rat. Credit Mohamed El-Sherbiny Usage Restrictions Credit must be given to the creator. License CC BY 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.