The centre's dean, Assoc Prof Dr Syed Azhar Syed Sulaiman said the products were tested since a year ago after they were delivered by the National Pharmaceutical Control Bureau and the product manufacturers to identify the source of gelatine in the capsules.

"Out of 100 products we tested, 30 were not halal because pig gelatine was used in making the capsules. Pig gelatine is cheaper compared to cow gelatine.

"However, this does not represent the overall situation where gelatine capsules are concerned in Malaysia as manufacturers took remedial action by changing to capsules made from cow gelatine on being informed of the matter," he told a news conference at the university here Monday.

He urged the Health Ministry to make it compulsory for health product manufacturers to ensure gelatine used in their products was halal.

Meanwhile, a group of USM researchers headed by Associate Prof Dr Gam Lay Harn has successfully produced a method, a first in Malaysia, to identify gelatine source in medicine or health product capsules.

"By using specific bio-markers for every type of gelatine, we can identify whether the gelatine source is from a cow or a pig.

"This method is not only able to trace the source but also identify gelatine mixture from various sources," he said.

He added that USM had filed to patent the findings of the research worldwide.