A supplement is defined as a 'food' and falls under all the same rules and regulations related to food standards and additives as food.
I don't believe that tainted supplements exist. If a food/supplement company was deliberately adding controlled/restricted pharmaceuticals to their product the consequences would be extremely serious, just like if Red Bull added meth to its energy drinks. 'Tainted' implies that its accidental contamination, and food can get accidentally contaminated, for example, we are all used to reading 'may contain nuts' because although the product doesn't contain nuts, it is processed in a facility which also processes nuts, so they can't rule out contamination. Still, its impossible to believe, in the same way, that food could be cross-contaminated with pharmacological agents .
Some banned substances have in the past been (and still are being) sold as supplements, e.g DMAE and often the question over whether something is natural vs a pharmaceutical agent is blurred. Testosterone is natural right?
So I don't think that tainted supplements exist, but a lot of the tests for PEDs don't actually accurately test for the presence of a particular chemical compound, they use 'round about' methods and probabilities and these 'natural' supplements may trigger the tests in the same way as the pharmaceuticals even though a different chemical is involved. It reminds me of a supplement I took for a while 'GSE' (Grapefruit Seed Extract) which claims to be an anti-viral and anti-bacterial agent, but when it was tested, the labs said it contained benzethonium chloride which could not have come from Grapefruit Seeds
https://en.wikipedia.org/wiki/Grapefruit_seed_extract
But obviously it didn't because GSE is used rather widely and benzethonium chloride is a pretty nasty agent the you would know about pretty quickly if you ingested it. But it shows up the same way in the tests.
I don't believe that tainted supplements exist. If a food/supplement company was deliberately adding controlled/restricted pharmaceuticals to their product the consequences would be extremely serious, just like if Red Bull added meth to its energy drinks. 'Tainted' implies that its accidental contamination, and food can get accidentally contaminated, for example, we are all used to reading 'may contain nuts' because although the product doesn't contain nuts, it is processed in a facility which also processes nuts, so they can't rule out contamination. Still, its impossible to believe, in the same way, that food could be cross-contaminated with pharmacological agents .
Some banned substances have in the past been (and still are being) sold as supplements, e.g DMAE and often the question over whether something is natural vs a pharmaceutical agent is blurred. Testosterone is natural right?
So I don't think that tainted supplements exist, but a lot of the tests for PEDs don't actually accurately test for the presence of a particular chemical compound, they use 'round about' methods and probabilities and these 'natural' supplements may trigger the tests in the same way as the pharmaceuticals even though a different chemical is involved. It reminds me of a supplement I took for a while 'GSE' (Grapefruit Seed Extract) which claims to be an anti-viral and anti-bacterial agent, but when it was tested, the labs said it contained benzethonium chloride which could not have come from Grapefruit Seeds
https://en.wikipedia.org/wiki/Grapefruit_seed_extract
But obviously it didn't because GSE is used rather widely and benzethonium chloride is a pretty nasty agent the you would know about pretty quickly if you ingested it. But it shows up the same way in the tests.