There have been many scientific studies conducted on the potential health benefits found in kefir. Drinking kefir is shown to have positive health benefits on the immune system and may make the body more resistant to disease. The antibacterial properties of kefir can help to prevent infections. Other nutrients, like calcium, magnesium, and vitamin D, help promote bone health and prevent diseases such as osteoporosis.  Probiotics have been shown to help the body defend against cancer by empowering the immune system to fight tumors. Another benefit that it has to the immune system is that it can be beneficial to those with allergies, including lactose intolerance. It also can improve asthma symptoms. Studies in mammals show it can reduce the number of cancer cells by more than 50%. Drinks and foods with probiotics also help to promote a healthy digestive system and may be beneficial in preventing digestive problems.