A four-week randomized clinical trial involving 72 adults found that combined rosemary and ginger extracts significantly reduced markers of oxidative DNA damage among participants classified as higher risk because of excess weight and smoking, adding to research examining the cellular effects of culinary herbs and spices.
By yourNEWS Media Newsroom.
Common culinary herbs and spices may contain compounds capable of influencing cellular responses to oxidative stress, according to a 2026 pilot trial that found measurable reductions in oxidative DNA damage among higher-risk adults who consumed a combination of rosemary and ginger extracts.
Researchers at Seoul National University of Science and Technology conducted the randomized, double-blind, placebo-controlled study involving 72 adults over four weeks.
Participants were divided into a Healthy group and a Risk group, with the latter characterized by excess weight and smoking status. Individuals in each group received either a placebo, a lower dose or a higher dose of combined rosemary and ginger extract each day.
The most pronounced changes occurred among participants in the Risk group.
Those receiving either dose of the rosemary-ginger preparation experienced significant declines in oxidative DNA damage, while changes among healthier participants were less substantial.
The results suggest that baseline health status may influence how readily antioxidant interventions produce measurable effects.
Oxidative stress occurs when the generation of reactive molecules exceeds the body’s capacity to neutralize or repair their effects. When persistent, that imbalance can damage lipids, proteins and DNA and has been studied as one biological process involved in aging and numerous chronic diseases.
DNA damage itself does not mean a person will develop cancer. Cells possess extensive repair systems, and the relationship between oxidative stress, mutations and disease develops through many interacting biological and environmental factors. Researchers nevertheless study oxidative DNA damage because unrepaired or incorrectly repaired genetic injury can contribute to cellular abnormalities over time.
The study found relatively little change in several circulating measures of inflammation and oxidative stress when participants were considered as a whole.
The DNA findings among higher-risk participants, however, were more pronounced.
Researchers suggested one possible explanation: people who begin with a greater oxidative burden may have more room for measurable improvement than participants whose baseline levels are already comparatively low.
Smoking is a well-established source of oxidative stress, while excess adiposity can be associated with chronic inflammatory and metabolic changes. Participants carrying those risk factors therefore may have started the study with greater cellular stress.
That could help explain why rosemary and ginger supplementation produced clearer changes in their DNA-damage measurements than in the Healthy group.
The high-dose treatment was also associated with an increase in erythrocyte phosphorylated endothelial nitric oxide synthase expression.
Endothelial nitric oxide synthase is involved in production of nitric oxide, an important signaling molecule that helps blood vessels regulate dilation and vascular function. The change therefore raises the possibility that the extracts could influence cardiovascular signaling, although the short pilot trial was not sufficient to establish a clinical cardiovascular benefit.
The findings add to a larger body of research examining compounds naturally present in herbs and spices.
Rosemary contains numerous phenolic compounds with antioxidant activity, while ginger contains biologically active constituents including gingerols and related compounds that have been investigated for anti-inflammatory and antioxidant effects.
Earlier research has reported reductions in markers of DNA damage associated with ginger and rosemary consumption, in some studies approaching 25%.
The 2026 trial strengthens that line of investigation by examining the herbs together under randomized, placebo-controlled conditions, although its small size and four-week duration mean larger and longer trials will be needed to determine whether the effects persist and translate into meaningful reductions in disease risk.
Turmeric, although not included in the Seoul trial, has also attracted substantial scientific attention for possible effects on oxidative stress and inflammation.
Its best-known constituent, curcumin, has been examined in laboratory and clinical research involving inflammatory pathways, cellular signaling and cancer biology.
Prior research highlighted by physician and author Dr. Michael Greger reported a substantial reduction in measured DNA damage after consumption of a small daily amount of turmeric, approximately one-eighth of a teaspoon.
Other laboratory and preclinical research associated with institutions including the University of Chicago, Harvard Medical School and M.D. Anderson Cancer Center has investigated curcumin for effects involving tumor initiation, angiogenesis and cellular responses to hormone-like environmental compounds.
Those findings require careful interpretation.
Laboratory evidence that curcumin interferes with cancer-related pathways does not establish that culinary turmeric prevents or treats cancer in people, and results obtained with purified compounds or concentrated preparations cannot automatically be reproduced by eating ordinary amounts of the spice.
Turmeric nevertheless remains one of the most extensively studied culinary spices because curcumin can interact with multiple inflammatory and oxidative pathways.
The new rosemary and ginger findings similarly should not be interpreted as evidence that adding spices to food can prevent cancer or reverse chronic illness.
The trial measured biological markers rather than disease incidence, involved only 72 participants and lasted four weeks.
Its significance lies in demonstrating that a relatively short intervention produced detectable changes in a marker of oxidative DNA injury among participants with greater baseline risk.
For everyday dietary use, rosemary, ginger and turmeric can be incorporated into meals without relying on highly concentrated supplements.
Fresh ginger can be sliced or grated into tea, soups, stir-fries and sauces. Rosemary can be added to roasted vegetables, beans, poultry and other dishes, while turmeric can be incorporated into soups, curries, grains and beverages.
Combining rosemary and ginger with ingredients such as olive oil and garlic can also provide a practical way to increase culinary use of both herbs, although ordinary food preparations should not be considered equivalent to the standardized extracts and doses used in the clinical trial.
Supplementation requires additional caution because concentrated extracts can deliver amounts far exceeding those typically consumed in food.
High-dose turmeric and curcumin preparations have been tolerated in some short-term studies, including doses reaching several grams per day, but that does not mean very high doses are appropriate for everyone or safe indefinitely.
Concentrated ginger, turmeric and other herbal products can also interact with medications or affect physiological processes differently from culinary amounts.
The broader implication of the research is therefore not that a spice rack functions as a substitute for medical treatment, smoking cessation, weight management or other established approaches to reducing chronic disease risk.
Instead, the 2026 trial provides controlled human evidence that compounds derived from rosemary and ginger can influence at least one measure of cellular oxidative injury, with the strongest response appearing among participants carrying greater lifestyle-related risk.
Combined with earlier research on ginger, rosemary and turmeric, the findings support continued investigation into how ordinary plant foods and their concentrated bioactive compounds interact with inflammation, oxidative stress, vascular signaling and DNA protection.
For most people, using these spices regularly as part of a varied, minimally processed diet offers a simple way to increase exposure to plant-derived phytochemicals without depending on high-dose supplements, while the clinical significance of their effects on DNA damage continues to be studied.
Source: Natural News
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