in general, the frequency of sodium nitrite is very important there are several types of sodium nitrite. There is one that is used for food additives, it is an E250 additive and there is also a technical sodium nitrine that is used in construction. however, if you buy not pure sn, but let's say sn that contains saltpeter, then it will not work either, the only thing I can advise is to look for it in your country of origin and try to find exactly sn with the formula NaNO2 and see that the frequency is at least 95 percent in my case it is 99.45%. If you buy not pure sn, then most likely you will not succeed because I think it will just be digested because there is not a large amount of sn contained there, or even if it gets into the blood it will not be enough for you to commit ctb plus it is not pure sn, so it is not known what the consequences may be