Natural Antioxidants as Biological Modulators: From Molecular Targets to Clinical Outcomes

Twesigye Davis

Department of Pharmacognosy Kampala International University Uganda

Email: twesigyedavis@studwc.kiu.ac.ug

                                                                    ABSTRACT
Oxidative stress plays a central role in the pathogenesis of a wide range of human diseases, including cardiovascular diseases, neurodegeneration, cancer, diabetes, and inflammatory disorders. Natural antioxidants-compounds derived from dietary sources, medicinal plants, and isolated bioactive constituents such as vitamins, flavonoids, carotenoids, and polyphenols-offer biological modulation of reactive oxygen and nitrogen species (RONS) and influence numerous molecular targets linked to disease progression. These compounds scavenge free radicals, regulate redox-sensitive signaling pathways, and modulate gene expression through direct and indirect mechanisms, including the activation of endogenous antioxidant defenses such as Nrf2 and suppression of pro-inflammatory transcription factors like NF-κB. Despite promising preclinical evidence demonstrating beneficial effects across multiple systems, clinical outcomes have been mixed, with some large trials showing limited efficacy of isolated supplementation while others indicate protective effects in combination regimens or functional dietary patterns. This review synthesizes current understanding, from molecular mechanisms to clinical trials, examining how natural antioxidants influence biological processes and disease outcomes, highlighting key challenges, and proposing future research directions.

Keywords: Natural antioxidants, Oxidative stress modulation, Molecular targets, Clinical outcomes, Redox signaling.

CITE AS: Twesigye Davis (2026). Natural Antioxidants as Biological Modulators: From Molecular Targets to Clinical Outcomes. NEWPORT INTERNATIONAL JOURNAL OF BIOLOGICAL AND APPLIED SCIENCES 7(2):36-41. https://doi.org/10.59298/NIJBAS/2026/7.2.3641