Omega 3 supplements not purity tested guaranteed

Dischem doesnt and cannot sell safe Omega-3 fish oil supplements. They cannot special order any either. None of their Omega-3 Supplements have the Third party tested guarantees nor the freshness purity guarantees like the Nordic Naturals Ultimate Omega or the Carlson the very finest fish oil. All the Omega-3 supplements they sell are not specially testes for harmful heavy metals nor pollution so the supplements the do sell can cause Alzheimer's with all the heavy metals they contain. I asked twice and emailed dischem and they do not stock any and does not care. The supplements they sell thats supposed to help brain function can instead cause you Alzheimer's which to me is extremely stupid. None of their omega 3 fish oil suppliments have purity tested guarantees against harmful heavy metals and pollution.