New York: With surge of online sales, breast milk has become a commodity -- and not just for infants, says an editorial published in the journal Breastfeeding Medicine.

The practice of breast milk-sharing among mothers has evolved into an internet-based marketplace in which this valuable commodity is being bought and sold not only to feed babies but as a ‘natural superfood’ for body builders and athletes, the editorial said.

‘Clearly, breast milk has become a commodity,’ said Arthur Eidelman, editor-in-chief of Breastfeeding Medicine.

As women recognise its commercial value, ‘the altruistic donation of breast milk to regulated non-profit human milk banks is being threatened’.

‘Internet-purchased breast milk may also be risky due to dilution with cow's milk or bacterial contamination due to improper storage and refrigeration,’ the editorial warned.