Potency differs not only in between brand names but even for flavorings of the exact same brand. Companies like Flavourart as well as Inawera are well-known for their potent focuses, where 1-2% is more than enough to control a dish-- however even several of their own can be utilized in the 5-10% array. An excellent indicator of effectiveness is the "average mixing quantity" percentage, which can be found on each flavor's page at ELR.
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