The Cut recently profiled an athlete in peak condition that turned to a special formula for keeping his stamina up. While new energy drinks and exercise tips are always coming around, this one is raising a few eyebrows. The miracle drink is breast milk, favored by what seems to be a burgeoning number of men.

Athletes are just one segment of breast milk’s new customer base. According to the Washington Post, one man used it to ease nausea related to chemotherapy and another found it to be an immune booster. Of course, there are those that just enjoy breast milk because of a fetish. Freudian concerns aside, human breast milk does contain proteins, fats, and carbohydrates plus cells called leukocytes, which help fight infection.

The majority of breast milk consumers are men and most of them purchase their supplies online. They get it from sites such as Only the Breast, Eats on Feets, and Human Milk 4 Human Babies. National milk banks generally do not offer supplies for adults. There are also more casual sources of breast milk, such as Craigslist.

However, the Wall Street Journal warns that these internet breast milk sellers are not uncommon and may not be safe.  Purchasing breast milk from these sources is tempting, with prices at a few dollars per ounce.  However, a recent examination of breast milk bought on the internet found that three-fourths of the samples contained high amounts of bacteria.