Contains a diverse community of probiotics. Main bacteria in human milk are Proteobacteria and Firmicutes, including Staphylococcus (31%), Enterobacteriaceae (10%), Pseudomonas (17%), and Streptococcus (5%).
Milk is one of the best sources of calcium, essential for healthy bones and teeth and a rich source of potassium. A glass of milk a day' may delay knee osteoarthritis in women. Calcium and lactose have been suggested to prevent ovarian cancer. Research also supports a relationship between higher intakes of calcium and reduced risks of colorectal cancer, but the results of studies have not always been consistent. The acidifying effect of animal proteins, however, could have a negative effect on bone health by causing the body to pull calcium from the bones to restore optimal blood pH. High amounts of saturated fat and cholesterol found in unprocessed milk have been also linked to an increased risk of heart disease.