According to the COA, it's purity is 98.5% NaNO2, which according to data in the PPH, is more than sufficient to get the job done, as long as the known protocols are followed. Can the COA from this company be trusted? I have no idea. How stringent are fraud laws in Egypt? Are companies like this regulated by the government? i'd run a blood test on it after you receive it as desribed in these forums. Also, you could send a small amount off to an independent lab for testing and verification if you really want to make sure.