Selenium Supplementation and Alzheimer’s Disease

Clinical studies show a clear correlation between Alzheimer’s Disease and low selenium status.  Lower selenium status is associated with worse cognitive decline [Aaseth 2016].

In many regions of Europe and the Middle East, there is poor selenium content in the soil and, accordingly, lower intake of selenium from food sources [Stoffaneller & Morse 2015; Winther 2020].

Woman with Alzheimer's
Adequate levels of selenium are essential for brain function; in fact, the brain is one of the organs that is supplied with selenium at the expense of other organs and tissues in times of low selenium intake. Selenoprotein P plays a special role in delivering selenium to the brain and the neurons. Some of the glutathione peroxidase and thioredoxin reductase selenoenzymes are important intracellular antioxidants in neurons and glia cells of the central nervous system.

The daily intake of selenium from food in many European countries is well below the amount needed for optimal function of important selenoproteins. The needed intake of selenium from food is  estimated to be at least 105 mcg per day [Winther 2020, fig. 2].

Using evidence from human studies in various countries, Prof. Jan Aaseth and colleagues have documented the association between lower selenium  status and Alzheimer’s Disease and/or cognitive impairment [Aaseth 2016]. read more