Muslim groups want a boycott in Malaysia of Cadbury products after two chocolate varieties broke Islamic rules by containing pork DNA.
On Monday Cadbury Malaysia recalled Dairy Milk bars after authorities found the pork traces during a random test.
A Muslim retail group said the 800 stores it represents would be asked not to sell Cadbury and Kraft products.
Cadbury said it is working with the Islamic Affairs Department to ensure products comply with halal guidelines.
It said the authorities were conducting more tests and would announce their results within a week.
Bazeer Ahmad, an advisor with the Malaysian Muslim Wholesalers and Retailers Association said: “Although only two products were listed as contaminated, since the same mechanism is used to produce other products, doubt exists in our minds that all products could be exposed to the same contamination.”