A growing market in the online sale of human breast milk is creating a serious health risk, doctors have warned.
An increasing number of adults are drinking breast milk, convinced the health benefits it provides to infants could boost fitness levels and immune systems.
It has become particularly popular among gym-goers or those who have chronic diseases.
But doctors warn human milk can be hazardous, spreading viruses such as hepatitis B and C, HIV and syphilis. And because it is not pasteurised, it is also full of germs.
Writing in the Journal of the Royal Society of Medicine, they call for regulators to make it clear buying milk online is not safe.
Fetching NZ$100 a litre or more, the milk is offered either fresh or frozen, and is often available by post from websites. It is claimed to boost the immune system, help recovery, and build muscles.