A condition in which the production of reactive oxygen species (ROS) and other oxidizing molecules exceeds the body’s antioxidant defense capacity. The resulting molecular damage affects proteins, lipids, and DNA—contributing to cellular dysfunction, inflammation, and tissue degradation.

Oxidative stress is implicated in aging, neurodegeneration, cardiovascular disease, and nearly every chronic condition Peptidings covers. Multiple peptide compounds target oxidative pathways: SS-31 (Elamipretide) protects mitochondrial cardiolipin from oxidative damage, Glutathione is the body’s primary intracellular antioxidant, and GHK-Cu modulates antioxidant enzyme expression. The challenge in evaluating these compounds is that “reducing oxidative stress” is measurable in the lab but difficult to connect to specific clinical outcomes in humans.