For years, Mark, a 52-year-old American, thought feeling tired all the time was simply part of getting older.

He still went to work. He still handled his responsibilities. He still tried to stay active.

But something had changed.

By late afternoon, his energy seemed to disappear.

He would come home from work and tell his wife, “Maybe tomorrow.”

Tomorrow he would take that walk.

Tomorrow he would work on the project in the garage.

Tomorrow he would finally spend more time doing the things he enjoyed.

And then tomorrow became next week.

Then Mark came across something he hadn’t thought much about before:

Mitochondria.

These tiny structures inside your cells are often described as the body’s cellular “power plants” because they play an important role in energy production.

As we get older, supporting healthy mitochondrial function can become increasingly important.