Transcript for A Glimmer of Hope for Alzheimer's Patients
Glimmer of hope in the fight against alzheimer's more than five million Americans over the age of 65. Are living with the disease and a new study out tonight -- vitamin. May hold the secret benefit for some of those patients. ABC's chief medical editor doctor Richard -- -- back here tonight with us -- and -- there was some good news here yet this is good news researchers looked at older men who had mild to moderate alzheimer's who were already taking drugs like -- They gave some of the men high dose vitamin. What they found of the two years of the study those who took the high goes -- many were able to do those things taking care themselves like taking a -- and getting dressed. For longer period of time and what was it about by limiting. Well you know their theories on this they don't know for sure but take a look at this is takes place inside to bring their chemicals called free radicals which damage brain tissue. Vitamin. High dose vitamin. And so it's only been shown to be beneficial in people -- all already have alzheimer's disease. So don't start taking this drug without your doctor check with your doctor -- -- -- -- -- -- thing.
This transcript has been automatically generated and may not be 100% accurate.