"Antioxidant" is one of the most used words on supplement labels, and one of the least explained. To understand what antioxidants do, you first need to understand what they are defending against.
What Are Free Radicals?
Every cell in your body uses oxygen to make energy. That process is remarkably efficient, but it is not perfect. A small share of oxygen molecules end up missing an electron. These unstable molecules are called free radicals, or reactive oxygen species.
A free radical tries to steal an electron from whatever is nearby: a cell membrane, a protein, even DNA. When it succeeds, it can damage that structure and create a new free radical in the process, setting off a small chain reaction.
Where Free Radicals Come From
Most free radicals are simply a byproduct of being alive. Your body produces them through:
• Normal energy production inside your mitochondria
• Exercise, which temporarily increases energy use
• Your immune system, which uses free radicals to destroy germs
Outside sources add to the load, including sunlight, cigarette smoke, air pollution, alcohol, heavily processed foods and chronic stress.
What Is Oxidative Stress?
Free radicals are not all bad. In small amounts they act as signals, helping muscles adapt to exercise and helping the immune system do its job. Problems arise when free radicals outpace the body's ability to neutralize them. That imbalance is called oxidative stress.
Researchers study oxidative stress as one of the processes involved in aging. It is not a disease on its own, and it cannot be measured with a routine blood test, but it is a useful way to understand why the body invests so much in antioxidant defenses.
Your Body's Three Lines of Defense
1. Antioxidant Enzymes
Your cells make their own antioxidant enzymes, and these do most of the work. Superoxide dismutase needs zinc and copper (or manganese). Glutathione peroxidase needs selenium. Without enough of these minerals, the enzymes cannot work at full strength.
2. Glutathione
Glutathione is often called the body's master antioxidant. It is made inside your cells from three amino acids, and the one in shortest supply is usually cysteine. That is why N-acetyl cysteine (NAC) is used to support glutathione production.*
3. Antioxidants From Food
Vitamins C and E and thousands of plant compounds called polyphenols help neutralize free radicals directly. This is why colorful fruits and vegetables are so consistently linked with good health.
What Actually Helps
• Eat a colorful diet. Berries, leafy greens, beans, nuts, olive oil and tea supply a wide range of antioxidants.
• Don't smoke, and limit alcohol. Both are major sources of free radicals.
• Stay active. Regular exercise strengthens your natural antioxidant defenses over time.
• Sleep well. Much of the body's repair work happens during deep sleep.
• Protect your skin from excess sun.
• Cover nutrient gaps. Make sure you get enough of the minerals and building blocks your antioxidant systems depend on.*
A Word About Balance
More is not always better. Because free radicals also serve as useful signals, flooding the body with very high doses of single antioxidants has not proven helpful in large studies, and a few have raised safety concerns. The goal is support and balance, not megadoses.
The Bottom Line
Oxidative stress is a normal part of life that your body is well equipped to handle when it has the right raw materials. Healthy habits come first. Nutrients that support your own antioxidant systems, such as zinc, selenium and NAC, can help fill the gaps.
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