Curcumin. This research-backed spice from the turmeric plant shows anticancer and anti-inflammatory properties; unfortunately, it’s not well absorbed when sprinkled on food. Try 500 mg twice daily in a standardized powder capsule.

Omega-3 fatty acids. Inflammation is increasingly linked to many forms of cancer, and omega-3s fight inflammation. Try 2 grams of EPA-DHA daily in a fish oil or vegetarian capsule.

Vitamin D. Some studies show that vitamin D supplementation reduces breast density, a risk factor for developing breast cancer. (Breast density can also make it hard for clinicians to find tumors with a mammogram.) One four-year trial of 1,179 postmenopausal women found that those who took 1,100 IU vitamin D3 plus calcium daily significantly reduced their risk for all cancers.