The study, “ Anti-Oxidative and Anti-Inflammatory Effects of Ginger in Health and Physical Activity: Review of Current Evidence,” by Mashhadi et al. (2013), reviews research on how ginger and its compounds may help calm inflammation and protect against free-radical-induced cell damage. Mashhadi, Ghiasvand, Askari, Hariri, Darvishi, and Mofid wrote the paper to map out what science had shown by 2012. They searched medical databases, narrowed hundreds of papers to a smaller set, and summarized the findings on ginger's anti-inflammatory, antioxidant, cancer, and blood sugar effects.

Ginger (Zingiber officinale Rosc.) is the root of a plant in the Zingiberaceae family. It originated in Southeast Asia and spread worldwide as a spice, but people have also used it as folk medicine for centuries. The authors group their compounds into two kinds. Volatile oils give ginger its smell and taste. Non-volatile compounds, including gingerols, shogaols, paradols, and zingerone, do most of the medical work in lab studies.

The review lists many conditions where ginger has been tested: arthritis, indigestion, ulcers, atherosclerosis, high blood pressure, nausea, diabetes, and cancer. The authors also note interest in ginger for exercise recovery. They write that “ginger consumption before exercise might reduce naturally occurring quadriceps muscle pain during moderate-intensity cycling exercise.”

The team searched two large medical databases, MEDLINE and EMBASE, in July 2012. They used the search terms “ginger” with “anti-oxidative” and “ginger” with “anti-inflammatory.” They limited their results to English-language papers published from 2000 to 2012 and included both human and animal studies. The initial Medline search returned 211 papers. After review, they kept 59 and summarized 12 full-text studies in a table.

This is a narrative review, not a systematic review or meta-analysis. The authors did not use a formal scoring system to rate each study's quality. They pulled together the findings and described patterns.

The paper explains that the body produces free radicals during normal metabolism, but excess free radicals cause oxidative stress and DNA damage. Ginger compounds help neutralize these molecules. The review states that “6-Shogaol has exhibited the most potent antioxidant and anti-inflammatory properties in ginger.” Animal studies showed that ginger reduced lipid peroxidation and increased antioxidant enzyme and glutathione levels. One rat study even found that ginger had antioxidant power “equal to that of ascorbic acid” (vitamin C).

The review also notes protective effects on organs. Ginger and Arabic gum demonstrated kidney-protective effects in renal failure models. Ginger extract eased liver damage caused by carbon tetrachloride (CCl4) and acetaminophen. In another study, ethanol-induced liver damage in rats improved with 1% dietary ginger over one month.

Inflammation is the body’s repair response, but chronic inflammation drives many diseases. The review explains that gingerol, shogaol, and related compounds block prostaglandin and leukotriene production by inhibiting the enzymes 5-lipoxygenase (5-LOX) and prostaglandin synthetase. They also reduce inflammatory signals, including interleukin-1 (IL-1), tumor necrosis factor alpha (TNF-α), and interleukin-8 (IL-8).

The authors highlight that 6-shogaol can downregulate inflammation-related genes, including iNOS and COX-2, in immune cells. The paper notes that the activation of nuclear factor kappa B (NF-κB) “is linked to a variety of inflammatory diseases, including cancer, atherosclerosis, myocardial infarction, diabetes, allergy, asthma, arthritis, Crohn’s disease, multiple sclerosis, Alzheimer’s disease, osteoporosis, psoriasis, septic shock, and AIDS.” Ginger extract can lower NF-κB activity in animal models.

The review found mixed results on osteoarthritis (OA). One trial showed ginger extract had a “statistically significant effect on reducing symptoms of osteoarthritis of the knee.” Another trial showed benefit only in the first part of the treatment. In gout, the compound 6-shogaol showed strong anti-inflammatory activity in lab studies.

The exercise finding is more direct. The paper cites a study by Black and colleagues that used 2 grams of ginger per day for 11 days in 36 participants. The authors write that “daily consumption of raw and heat-treated ginger resulted in moderate-to-large reductions in muscle pain.” This is one of the few findings from human trials in the review.

The review lists cancer types where ginger compounds have shown activity in cells or animals: colorectal, gastric, ovarian, liver, skin, breast, and prostate. The compounds work in many ways. They can stop cancer cells from multiplying, trigger cell death (apoptosis), block tumor blood vessel growth, and lower NF-κB activity.

In rats with colon cancer, ginger increased levels of protective enzymes and reduced tumor formation. In gastric cancer, 6-gingerol blocked NF-κB activation and increased caspase activity, thereby helping damaged cells die off. In mice with skin cancer, ginger inhibited tumor blood vessel growth.

Researchers have studied P. amarus for its blood sugar-lowering ability in people with diabetes. A small clinical trial with 21 patients showed a significant drop in blood sugar levels after they took an aqueous extract of the plant.

In animal studies, diabetic rats treated with P. amarus also had better blood glucose control. These effects are likely linked to the plant’s antioxidant action, which helps protect insulin-producing cells in the pancreas.

Several animal studies showed ginger lowered blood glucose, total cholesterol, LDL, VLDL, and triglycerides in diabetic or high-fat-diet rats, while raising HDL (“good” cholesterol). One study used ethanolic ginger extract for 20 days and found a “significant antihyperglycaemic effect (P < 0.01) in diabetic rats.” Other research points to insulin-related effects, though the human evidence is thinner.

The authors are fairly hopeful but careful. They write that ginger “can treat a wide range of diseases via immunonutrition and anti-inflammatory responses,” and they highlight the muscle pain finding as the strongest practical result for active people. They also remind readers that “cohort studies and controlled trials in vivo and in vitro need to be conducted to warrant the pharmacological applications of ginger.”

In everyday life, this means that ginger, as a food or in tea, is a low-risk addition to a normal diet and may provide modest anti-inflammatory benefits. For treating disease, the picture is still incomplete. Most strong findings come from rats, mice, and cells. Doses, forms, and timing in humans are not settled.

A 2013 research review of ginger's anti-inflammatory and antioxidant effects found that ginger compounds, especially 6-shogaol and 6-gingerol, reduce inflammatory signals, neutralize free radicals, and may help relieve post-exercise muscle pain. Lab and animal data also point to potential benefits for cancer, diabetes, and organ protection. The catch is that most of this evidence is preclinical. People can enjoy ginger in food without worry, but anyone hoping to use it as a treatment should wait for stronger human trials and talk to a doctor first.