In one study, 33 participants with normal chances of developing colon cancer, and no family cancer history, took 2,000 mg of ginger root extract per day or a placebo for 28 days. Doctors said that the dose was equal to 7/10ths of an ounce of raw ginger, a safe and reasonable dietary amount.
Before and after the study, researchers analyzed colon tissue for signs of inflammation. While there was no change for the placebo group, the ginger group had 28 percent lower levels of an enzyme the body releases in response to inflammation, including the type of inflammation that occurs in the early stages of colorectal cancer. Doctors are calling for more study to determine how much this inflammatory enzyme needsto decrease to prevent colon cancer.