The Ho Chi Minh City customs department said Monday it found a drug precursor in a gift consignment headed for Australia over the weekend, Lao Dong (Labor) newspaper reported.
The customs officers checked the consignment and found it contained clothes, shampoo and 11.5 kilograms of hair dye.
They handed over the suspicious batch to police, and tests found that some of the shampoo and hair dye bottles actually contained a total of two kilograms of pseudoephedrine.
The chemical is often used to make cold and sinus medicines but is also a key ingredient in the illicit manufacture of methamphetamines and other illegal drugs.
The sender of the consignment resides in the Mekong Delta province of Kien Giang, and the recipient is a relative of the sender in Australia, the officers said.
According to the department, 10 gift consignments headed for other countries have been seized for containing a total of more than 45 kilograms of drug precursors.
Local authorities are still investigating.