Here I, a chemical engineer with a higher education, remember the law that chemistry in school passes before the law of Mendeleev: “The properties of a chemical substance do not depend on the methods of obtaining it.” That is, whether the cooking salt is evaporated from a natural solution, whether it is obtained as a result of the neutralization of spicy sodium salic acid or extracted in some other way - it will in any case be NaCl, which after proper purification can quite salt food.

You are right. by 99.9 percent. But this is exactly 0.1% and hides under-purified impurities... which will be completely different in different ways of obtaining a substance, and since living organisms are an extremely complex system, such impurities can affect it very strongly and unpredictably. Of course, a significant increase in the degree of purification reduces the effect of impurities to nothing, but at the same time it is possible to splash out the child together with water: to consider that the sorcery decoction is effective only due to the main component, and to reproduce it only, while the action is achieved through the combination of very many substances in the right proportions. At the same time, against chemistry as a science I have nothing - only for))))