Ever wonder what is in an oxygen absorber?

If you've ever cracked open a bag of beef jerky or a fresh container of freeze-dried fruit, you've likely asked yourself what is in an oxygen absorber and why it's sitting there right next to your food. It's that little white packet that clearly warns you "DO NOT EAT" in about five different languages. While it looks like a simple tea bag filled with sand, there's actually a pretty cool bit of chemistry happening inside that tiny pouch to keep your food from going stale or getting moldy. ...

February 5, 2026 · 7 min · Corwin Agass