Collingwood is in England's squad for the Champions Trophy

His comments came in the wake of the revelation that Pakistan fast bowlers Shoaib Akhtar and Mohammad Asif had tested postive for a steroid.

Collingwood is an ambassador for UK Sport's 100% Me campaign, which educates sportsmen about doping.

"You have to be really careful what goes into your body," the Durham all-rounder commented.

Interview: England's Paul Collingwood

"Nobody wants to be taking drugs and they certainly don't want to be caught taking drugs when they didn't think they were taking drugs.

"That's the scariest thing about it. I'm sure this will open a lot of people's eyes."

The two players face a possible ban of up to two years if the findings are confirmed by the results of tests on their B samples.

Collingwood once played alongside Shoaib at county level and said the news had come as a shock.

Shoaib's international career could be ended by a lengthy ban

"He was a match-winner for us with his raw, express pace.

"If you took him with a pinch of salt he was fine, a decent bloke, and he came and did what was expected of him and won us games," he said.

All medications prescribed to the England team are scrutinised by their support staff, but Collingwood said the onus was on the individual players themselves.

"Physiologist Nigel Stockill or one of the other members of the medical staff will be gauging what is goodfor us and what is not.

"There are companies out there who have got the British Standard and those are the ones you have to stick with.

"Not everybody will but there are websites where you can check and it will give you a little tick or a cross," he added.