By printing the abstracts of technical studies, the author provides the evidence that melatonin helps prevent breast cancer and helps avoid resistance to chemotherapy drugs. Melatonin also helps keep cancer cells from changing to the type that can spread and develop metastases. You will learn how both maximizing natural melatonin and supplementing with melatonin pills may reduce your risk for breast cancer. You will learn how exposure of your eyes to light in the morning resets the internal clock and how exposure to light in the hours before bedtime stops melatonin production and increases risk for breast cancer. You will learn how using light bulbs the don't make blue light or wearing glasses that block blue light can maximize natural melatonin.