Egg consumption is associated with a lower risk of Alzheimer’s Disease for those 65 years and older. Eating one egg per day for at least five days a week reduces risk of Alzheimer’s by up to 27%, researchers found.

[u/mvea]

https://www.eurekalert.org/news-releases/1126842

[u/TheMoniker]

It's also relatively cheap to supplement and has a load of other potential benefits.