The company behind a supplement used by Welsh athletes Rhys Williams and Gareth Warburton has launched an investigation to determine whether the product may have had a part in their failed drugs tests.
European 400 metres hurdles champion Williams, the co-captain of Wales' Commonwealth Games athletics squad, has been provisionally suspended and will miss Glasgow 2014 as a result.
Both athletes have used Mountain Fuel supplements, which its owners say is "nutritionally balanced to ensure your body is fuelled for maximum performance".
On its website, Mountain Fuel says no products on banned lists are contained in its supplements, which cost 1.75 per sachet.
Owner Darren Foote, from Brynmawr in south Wales, expressed alarm at news of Williams' positive test but remains confident his product could not have been a factor.
"We're complying to help him and we've just sent everything off to be tested and looked at in case it could be ours," he told Press Association Sport.
"I expect to hear the results by Wednesday or Thursday of next week and I'll be coming up to Glasgow to tell everyone about it."
Foote stressed Welsh Athletics had not spoken to him regarding the positive tests, and said only "around 3,000 sachets" had ever been produced.
He said: "The manufacturer that makes it complies with the anti-doping system. All the ingredients used in products aren't on the World Anti-Doping Agency's banned list.
"I have ethics. I believe Rhys Williams didn't take this stuff willingly or knowingly. I know him and he wouldn't do it.
"I'm angry everyone has pointed the finger at us. It's because I'm one of the little guys that people are pointing the finger."
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