Oxidative stress and cardiometabolic risk.
Oxidative stress is not a marketing term. It is a measurable imbalance between the body's free radical load and its antioxidant defense, and it underlies a meaningful share of the chronic disease I manage in the intensive care unit.
The basic biology
Mitochondria, immune cells, and certain enzymatic reactions all produce reactive oxygen species as a normal byproduct of metabolism. These molecules are not inherently harmful. At controlled concentrations they signal, defend against pathogens, and modulate cellular function. The body has elegant defense systems, glutathione, superoxide dismutase, catalase, and dietary antioxidants, that keep them in check.
When production exceeds defense, that excess oxidizes membrane lipids, modifies proteins, and damages DNA. The result is the molecular fingerprint we read at the bedside as endothelial dysfunction, insulin resistance, chronic inflammation, accelerated atherosclerosis, and over decades, neurodegenerative disease.
Where the load comes from
Five sources do most of the work in a midlife man. Visceral adiposity, which is metabolically active tissue that produces inflammatory cytokines and ROS. Tobacco smoke, including secondhand. Air pollution, particularly PM2.5. Chronic sleep restriction, which doubles markers of oxidative damage within a single week of insufficient sleep. And ultraprocessed dietary patterns, which combine high glycemic load with a deficit of dietary antioxidants.
Notice what is absent from the list: stress in the abstract. Psychological stress contributes through downstream effects on sleep, eating, and inflammation, but it is rarely the dominant driver in isolation.
Why supplementation rarely fixes it
The intuitive move, swallow more antioxidants, has been tested rigorously and mostly disappoints. Large randomized trials of high-dose vitamin E, vitamin C, and beta-carotene have not reduced cardiovascular endpoints in healthy adults, and some have shown harm. The body's antioxidant defense is a system, not a single molecule, and overwhelming one node with megadose supplementation does not strengthen the whole.
What does help is reducing the load and supporting endogenous defense through real food. A diet rich in polyphenols, dark berries, extra virgin olive oil, green tea, cruciferous vegetables, cocoa, raises endogenous glutathione and catalase activity. The signal is small per food but large in aggregate when sustained for years.
Where clinical interventions earn their place
Metformin lowers markers of oxidative stress modestly through AMPK activation and reduced mitochondrial ROS leak. SGLT2 inhibitors reduce oxidative load in patients with cardiometabolic disease. Mediterranean dietary patterns, with the strongest randomized trial evidence in cardiovascular prevention, reduce inflammatory and oxidative biomarkers.
Among supplements, the evidence is strongest for coenzyme Q10 in selected populations and N-acetylcysteine in specific clinical pictures. Neither is a routine recommendation. Both are prescription-grade decisions when used clinically.
The protocol I prefer
For the man in his forties or fifties who asks how to address oxidative stress, the order of operations is not glamorous. Sleep seven to eight hours. Move four days a week, with zone 2 cardiovascular training paired with resistance work. Eat plants forward of animal protein, with the bulk of carbohydrate around training. Eliminate tobacco. Limit alcohol to under five drinks a week. If the visceral fat will not move with lifestyle alone, a GLP-1 receptor agonist becomes a reasonable addition under physician supervision.
If the labs and clinical picture call for it, CoQ10, metformin, and NAD+ enter the conversation. They are tools, not headlines.
Frequently asked
Can oxidative stress be measured?
Several markers exist, including oxidized LDL, F2-isoprostanes, and 8-OHdG, but routine clinical measurement is limited. Most physicians infer oxidative load from the clinical picture and from upstream markers including hsCRP, fasting insulin, and lipid particle composition.
Are antioxidant supplements harmful?
High-dose isolated antioxidants, particularly vitamin E and beta-carotene, have shown neutral to harmful effects in large trials. Antioxidants delivered through whole food remain the more defensible approach.
Where does NAD+ fit?
NAD+ precursors including NR and NMN raise circulating NAD+ in human trials and show favorable mitochondrial effects in mechanistic studies. Long-term clinical outcome trials are ongoing. Selvara prescribes NAD+ for selected adults under physician review.
Care signed by a name you can look up.
Every Selvara protocol is reviewed by Dr. Sharma or a Selvara physician trained under his standard of care. Free intake. No card. Reviewed in 24 hours.
Begin intake, free