Written by &you Labs Team
Updated September 29, 2026
Oxidative stress gets talked about a lot, but rarely measured well. Free radicals, unstable molecules in your body, damage cell walls, proteins, and DNA. Over decades, this adds up. It plays a part in aging, heart disease, cancer, and other long-term illness.
Can you measure it? Yes, with a few catches. Direct testing still sits more in research than in routine care.
Oxidative stress happens when free radicals in your body outpace your antioxidant defenses. This damages your cells and DNA over time. Some blood tests measure the damage itself, such as 8-OHdG for DNA damage. Others measure your defenses instead, like glutathione or vitamin C. Direct testing is still mostly a special tool. Common markers like GGT, ferritin, and uric acid give useful clues instead.
Your cells make free radicals as a normal part of using energy. Doctors also call them reactive oxygen species. In small amounts, they even help send real signals.
In excess, they cause damage.
What gets damaged | The effect |
|---|---|
DNA | Raises the risk of mutation and cancer |
Cell membranes | Disrupts how your cells work |
Proteins | Weakens enzymes and structures inside your cells |
Mitochondria | Speeds up cell aging |
Your body fights back with antioxidants, like glutathione, and vitamins C and E. This state happens when the damage outpaces your defenses.
This kind of cell damage plays a role in several long-term illnesses.
You can change many of the causes.
A few lab tests look at the damage itself.
Test | What it measures |
|---|---|
8-OHdG | DNA damage. A specialty test, not routine |
F2-isoprostanes | Fat damage. Seen as the gold standard, but a specialty lab test |
Malondialdehyde (MDA) | Another fat damage marker, though less standard |
Oxidized LDL | LDL cholesterol that has been chemically changed, feeding artery disease |
Other tests look at your body's shield instead.
Test | What it measures |
|---|---|
Total antioxidant capacity | A broad measure of your defenses. Quick, but not very specific |
Glutathione | Your body's main antioxidant. A specialty test |
Vitamin C | Reflects recent intake. Useful if you suspect a shortage |
Vitamin E | An important fat-soluble antioxidant |
Selenium | Needed for your antioxidant enzymes to work |
CoQ10 | An antioxidant that supports your cells' energy factories |
You may already have these on a standard panel.
Marker | What a high result may suggest |
|---|---|
GGT | A liver enzyme. A high result can point to oxidative stress and low glutathione |
Ferritin | An iron storage and inflammation marker. High with normal iron can point to strain in the body |
Uric acid | Acts as an antioxidant, but is also tied to metabolic disease. Needs context |
hs-CRP | A general inflammation marker, closely tied to oxidative stress |
For most people, these common markers tell you enough.
You can check those same markers with a &you Labs panel.
Direct testing fits a few settings. These include research, special panels, and cancer prevention work. It is not needed for a routine yearly check. It is also not helpful during a current illness, when results shift fast.
Category | Examples |
|---|---|
Lifestyle | Smoking, heavy drinking, processed food, little movement, or too much hard exercise with no rest |
Environment | Air pollution, pesticides, heavy metals, too much sun |
Health issues | Chronic infection, ongoing inflammation, diabetes, some medicines |
Food is the biggest lever. Eat colorful vegetables and fruit, berries, green tea, and fish rich in omega-3s. Cut back on processed and charred food.
A few habits help too. Quit smoking. Keep alcohol moderate. Move your body often. Sleep 7 to 9 hours. Manage your stress.
Targeted pills can help in a confirmed shortage. Examples include vitamin C, vitamin E, selenium, CoQ10, and N-acetylcysteine. High doses are not a shortcut.
Research on high-dose antioxidant pills is mixed. It is not always reassuring. High-dose vitamin E has been tied to a small rise in death rates. This showed up in some studies. High-dose beta-carotene raised lung cancer risk among smokers in one major trial. These pills can also blunt some of the gains you get from a workout. The safer path is food first. Add a targeted pill only when a real, confirmed shortage calls for it.
A few results together tell a clearer story than one alone.
Pattern | What it suggests |
|---|---|
High GGT, high ferritin, high hs-CRP together | An ongoing oxidative and inflammatory state. Often tied to metabolic disease or alcohol use |
Low vitamin C or selenium | Weak antioxidant defenses. Worth fixing through diet |
Healthy common markers | A reasonable balance. Keep your current habits |
Oxidized LDL is a key driver of artery disease. Common markers like GGT, ferritin, and hs-CRP add real context too. Read them next to your cholesterol panel. Together, they give a fuller sense of your long-term heart risk.
For most people, no. Common markers like GGT, hs-CRP, and ferritin already give you real, useful clues. Direct testing fits specific research or longevity goals instead.
Whole-food antioxidants from colorful produce help. High-dose single-nutrient pills have mixed evidence, and can sometimes backfire. Lifestyle changes come first.
A hard workout raises it briefly, in a helpful way. Regular movement actually improves your defenses over time. Only heavy training without rest tips the balance the wrong way.
Yes, tests like TAC exist. But results vary a lot. It is not always clear what to do with the number.
Lab-based versions are fairly reliable. Direct-to-consumer versions vary more in quality, so check the lab behind any kit.
The &you Labs Team combines medical science with personal care. We help Filipinos understand their health markers with blood work analysis that is easy to follow, whole person support, and health expertise built for Filipino life.
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