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Scientific Glossary

Oxidative stress

Oxidative stress is an imbalance in which reactive oxygen molecules outnumber a cell’s defences, causing damage to proteins, fats and DNA.

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What it means

Sources include UV light, pollution, smoking and inflammation. Antioxidant enzymes and molecules such as glutathione help keep the balance.

“Free radicals” is often used loosely in marketing. The link between a given antioxidant and better health needs controlled trials.

Also known as

  • free radicals
  • reactive oxygen species
  • ROS

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Sources

General information, not medical advice. Talk to a clinician about any decision about your health.