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That’s the trouble with words like ‘artificial’ and ‘natural’. They mean nothing. It would be better to call them refined additives, because I expect the “stevia” would be in a refined, extracted form when added - whether substantially changed from the form present in the plant or not, this could be considered artificial, if we insist on using this word.
Check the username. Also, Western Europe (excluding Britain) is taking this threat pretty seriously if you follow current affairs.