(Yicai Global) March 22 -- A university student is raking in nearly $90,000 a year by shipping baby formula home to western China.

Chinese national Molder Sayrao, who moved to Australia to study at Macquarie University, began sending the product back home after her family and friends started asked for it when she arrived in 2014.

But Ms Sayrao's side business quickly spread by word-of-mouth and she now also ships vitamins, skincare creams and cosmetics.

Ms Sayrao is just one of an estimated 80,000 daigou, or personal shoppers, that currently buy and ship product from Australia to China.

But the controversial practice of shipping baby formula overseas has sparked anger among Australian consumers.

Supermarket shelves are often stripped of formula minutes after opening each morning, with customers sprinting through the stores to get their hands on the product.

Some supermarkets, pharmacies and chemists have now put in place measures to prevent the theft and bulk-buying of baby formula.

Generally, tins of baby formula are sold for between $20 and $23 in Australia. In China, they can fetch between $70 and $90.

Supermarkets, pharmacies and chemists across the globe are going to extreme measures to prevent the theft and bulk-buying of baby formula.

Walmart in America has placed security cameras in the baby formula aisle with a flashing monitor to tell potential thieves they are being watched.

In the United Kingdom, shoplifters are frequently reported for distracting staff to steal baby formula.

Walmart in America has placed security cameras in the baby formula aisle.

In Australia, sometimes the police are called to sepaprate two squabbling customers.