The results of two parallel and independent studies conducted by Italian and Canadian scientists show that drinking milk increases the risk of prostate cancer. A unique combination of proteins, magnesium, potassium and B group vitamins and calcium, makes milk one of the most important and healthy products in the daily diet. Although calcium is extremely important for bone health and skeletal growth, according to experts, taking large doses of the element correlates with an increased risk of prostate cancer. Prostate cancer is the third leading cause of cancer death in men of all ages and leading among men over 75. 80% of men over 80 have prostate cancer. Despite the conflicting results of numerous scientific studies, scientists are of the opinion that the vital microelement for the human body can increase or decrease the risk of certain oncological diseases. The latest scientific research shows that men who drink four glasses of milk a day double the chance of developing the disease. Calcium is one of the most abundant minerals in the human body. It makes up about 1.5% of total body weight. A person’s bones and teeth contain 99% of the total amount of calcium in the body. The main sources of calcium are milk and milk products, which supply more than 17% of the amount needed by the body. It turns out, however, that apart from maintaining the strength and density of bones, calcium is also related to tumorigenesis. In men who took the highest amount of calcium (659 mg/day), the probability of developing prostate cancer was a quarter higher than in those who took up to 210 mg/day of the trace element.